Spacecraft Launches Mission Status References
Starlink is a satellite constellation development project underway by SpaceX, to develop a low-cost, high-performance satellite bus and requisite customer ground transceivers to implement a new spaceborne Internet communication system.
SpaceX has said it will offer speeds of up to 1 Gbit/s, with latencies between 25 ms and 35 ms. Those latencies would make SpaceX's service comparable to cable and fiber, while existing satellite broadband services have latencies of 600 ms or more, according to FCC measurements.
Figure 1: Starlink constellation logo (image credit: SpaceX)
Some background: In November 2016, SpaceX filed an application with the FCC (Federal Communications Commission) for a license to operate a constellation of 4425 non-geostationary satellites (NGS) in orbits ranging from 1100 and 1300 km. However, when they issued their regulatory filings in 2017, the plan called for the deployment of nearly 12,000 satellites in Low Earth Orbit (LEO). 1)
However, competition from other satellite internet providers forced SpaceX to expedite their plans. By the Fall of 2018, the company announced a new plan to deploy their first batch of 1600 satellites to a lower altitude at 550 km. The development team also introduced a simplified design so that the first batch would be ready to go no later than the June of 2019.
Rather than broadcasting in two bands (“Ku” and “Ka”), the simplified design of the first batch will broadcast only in the “Ku” band. At present, SpaceX hopes to launch 2200 satellites in the next five years, which will act as a sort of prototype while the company develops an improved design for full-scale production.
Eventually, this will result in a constellation that offers the kinds of performance outlined in the company’s original plan. This presents numerous challenges, not the least of which is the fact that they will need to conduct launches every month for the next five years, averaging 44 satellites per launch.
Second, there’s the matter of attrition, as satellites will begin to deorbit after a few years and SpaceX will need to replace them regularly in order to maintain its constellation. In fact, Hugh Lewis – the UK Space Agency’s representative on the Inter-Agency Space Debris Coordination Committee – recently stated that in order to maintain a constellation of just 4425 satellites, SpaceX will have to launch that many every five years.
However, SpaceX intends to use this to their advantage by gradually replacing inactive satellites with ones that offer superior performance. In this way, the constellation will gradually be upgraded with the addition of heavier satellites that are capable of transmitting more information, and which are placed in longer-lasting, higher orbits.
Starlink is also going to be seeing competition in the coming years thanks to companies like OneWeb and Telesat, which plans to create smaller constellations that will offer service by 2021. Tech giants like Amazon and Samsung have also announced plans to deploy their own constellations, which would consist of 3,236 to 4600 broadband satellites, respectively.
Designed and built upon the heritage of Dragon, each spacecraft is equipped with a Startracker navigation system that allows SpaceX to point the satellites with precision. Importantly, Starlink satellites are capable of tracking on-orbit debris and autonomously avoiding collision. Additionally, 95 percent of all components of this design will quickly burn in Earth’s atmosphere at the end of each satellite’s lifecycle—exceeding all current safety standards—with future iterative designs moving to complete disintegration. This mission will push the operational capabilities of the satellites to the limit. SpaceX expects to encounter issues along the way, but the lessons learned here are key to developing an affordable and reliable broadband service in the future (Ref. 83).
Some spacecraft parameters: 2)
• Flat-panel design with multiple high-throughput antennas and a single solar array
• Spacecraft mass: 227 kg
• Hall-effect thrusters using krypton as the reaction mass, for position adjustment on orbit, altitude maintenance and deorbit
• Star tracker navigation system for precision pointing
• Able to use Department of Defense provided debris data to autonomously avoid collision 3)
• 95 percent of "all components of this design will quickly burn in Earth’s atmosphere at the end of each satellite’s lifecycle"
The 60 Starlink V1.0 satellites, launched on 11 November 2019, have the additional following characteristics:
• 100% of "all components of this design will quickly burn in Earth's atmosphere at the end of each satellite's lifecycle."
• Ka-band added
• Spacecraft mass of 260 kg
• Albedo reduced.
The satellites are stacked for launch without the need for a dispenser. As a propulsion system for orbit adjustment and maintenance as well as deorbiting, they use krypton-fueled Hall thrusters. The startracker navigation system is based on the heritage of Dragon. The satellites are designed autonomously avoid collisions based on uplinked tracking data. At the end of life, the Starlink satellites are to be actively deorbited, leading to reentry.
Orbit: Circular orbit with an altitude of 550 km. The Starlink spacecraft constellation will be spread into 24 orbital planes with an inclination of 53º.
• May 2, 2022: Evidence is mounting of a need to perform an environmental review before approving SpaceX’s plans to add nearly 30,000 satellites to its Starlink constellation, satellite broadband competitor Viasat told the FCC May 2. 4)
Figure 2: SpaceX has launched nearly 500 additional Starlink satellites so far this year (image credit: SpaceX)
- SpaceX shouldn’t be allowed to greatly expand its Starlink network while light pollution issues surrounding its deployed satellites remain unresolved, Jarrett Taubman, Viasat vice president and deputy chief of government affairs, said in a letter to the regulator.
- While calls for a thorough environmental review that Viasat made for Starlink’s current generation of satellites in December 2020 were largely rejected, Taubman said SpaceX’s plan to grow the constellation by seven times “would have significant aesthetic, scientific, social and cultural, and health effects on the human environment on Earth.”
- SpaceX has already deployed more than half of the 4,408 first-generation Starlink satellites the FCC has approved to operate at altitudes of around 550 kilometers. The company is seeking FCC permission for a larger constellation of second-generation Starlinks that it proposes to operate at lower altitudes — between 340 and 614 kilometers — in order to improve performance.
- In rejecting Viasat’s earlier petition to conduct a thorough environmental review on Starlink, the FCC urged SpaceX to continue to work closely with astronomers to mitigate the brightness of its satellites.
- SpaceX has said it is incorporating visors on Starlink satellites to prevent sunlight from reflecting off them, and implementing other measures to reduce interference with astronomers.
- But in the May 2 letter to the FCC, Taubman said these efforts “have not fully mitigated” the constellation’s light pollution issue.
- He said “there is mounting evidence—including analysis by independent experts—of the adverse, ongoing, and increasing impact of Starlink operations on the night sky notwithstanding any such efforts.”
- The letter pointed to a paper astronomers published in Nature Astronomy in April, which said none of the techniques that Starlink and other LEO constellations are exploring can fully avoid them “harming astronomical science ... launching significantly fewer satellites is the only mitigation that could do this.” 5)
- In a Feb. 8 letter to the FCC, NASA said SpaceX’s proposed Gen 2 network could double the number of Hubble Space Telescope images that contain satellite streaks, currently 8% of all images, and undermine the ability of the United States to detect and potentially redirect asteroids heading to Earth.
- “NASA estimates that there would be a Starlink in every single asteroid survey image taken for planetary defense against hazardous asteroid impacts, decreasing asteroid survey effectiveness by rendering portions of images unusable,” the space agency said in a letter signed by Samantha Fonder, NASA’s representative to the Commercial Space Transportation Interagency Group.
- SpaceX did not respond to a request for comment.
- Of the 17 Falcon 9 missions so far this year, 10 have been for Starlink. They alone have launched nearly 500 satellites for the constellation, according to statistics maintained by spaceflight analyst and astronomer Jonathan McDowell.
• April 22, 2022: Jet service provider JSX said April 21 it is set to become the first air carrier to provide Starlink’s satellite broadband services later this year. 6)
Figure 3: JSX said it is working closely with SpaceX to certify, test, and outfit the air carrier’s growing fleet (image credit: JSX)
- The semi-private charter company JSX (JetSuiteX, Inc) with HQs in Dallas, TX, said it signed a deal to provide Starlink in-flight Wi-Fi on up to 100 planes, covering the 77 30-seat Embraer jets currently in its fleet.
- Financial details were not disclosed but JSX said it intends to provide the services to passengers free of charge.
- The companies are testing a terminal that has been developed specifically for the aviation market, which Starlink vice president of commercial sales Jonathan Hofeller said March 22 is working toward certification on “various aircraft.”
- JSX’s announcement comes days after Delta Air Lines CEO Ed Bastian told the Wall Street Journal April 18 that it has conducted exploratory Starlink tests on its aircraft.
- More than 300 Delta aircraft are currently equipped with Wi-Fi using Viasat’s satellite network, and the airline has plans to connect at least 200 more planes to that network by the end of 2022.
- More than 300 Delta aircraft are currently equipped with Wi-Fi using Viasat’s satellite network, and the airline has plans to connect at least 200 more planes to that network by the end of 2022.
- Delta said March 14 more than 50% of domestic enplanements are served by Viasat connectivity.
- Viasat’s shares fell 1.4% to close at $45.54 April 18 after beginning the day at $46.17.
- Inflight connectivity provider Gogo’s shares also took a hit after the Wall Street Journal’s report, even though it sold the commercial part of its business that serves Delta planes to satellite operator Intelsat two years ago.
- Viasat’s shares started April 22 at $42.31, down 7.1% compared to their April 18 opening price.
- Inmarsat, SES and many other established satellite broadband operators are also chasing an inflight connectivity market that — despite recently suffering under pandemic-related travel restrictions — promises significant growth as passengers increasingly demand better connectivity services.
- Hofeller said March 22 that SpaceX sees connectivity on airplanes as ripe for an overhaul and that its services will be indistinguishable from conventional internet access.
- The company started seeking regulatory permission in 2020 to test Starlink services on private jets and the vessels Falcon 9 rockets land on for reuse. SpaceX is also planning to connect vehicles and other types of boats to Starlink to expand the broadband network out of fixed homes and offices.
- Starlink has a quarter-million subscribers that, following a recent price hike, are charged $110 a month for its standard service or $500 a month for a premium tier that uses an improved antenna with a broader scan angle.
- To date, SpaceX has launched 2,388 satellites to expand its Starlink network, according to statistics maintained by spaceflight analyst and astronomer Jonathan McDowell.
- Of those, McDowell’s data shows 2,150 satellites remain in orbit and 2,121 are operational.
- SpaceX’s most recent Starlink mission launched April 21 from Space Launch Complex 40 (SLC-40) at Cape Canaveral Space Force Station, Florida.
- The Falcon 9’s reused first stage that helped the company deploy 53 Starlink satellites had previously flown eight Starlink missions.
• April 7, 2022: SpaceX has lost the right to provide Starlink broadband services in France after the country’s highest administrative court revoked its spectrum license. 7)
- France’s Conseil d’État (Council of State) ruled April 5 that French telecoms regulator ARCEP (Autorité de Régulation des Communications Électroniques et des Postes) should have launched a public consultation before authorizing Starlink in February 2021.
Figure 4: France’s Conseil d’État revoked Starlink's spectrum license in the country April 5, following an appeal from environmental groups (photo: Gov. of France)
- “In law, they should normally cease [providing services] immediately, pending ARCEP’s public consultation” following the court’s decision, a Conseil d’État spokesperson told SpaceNews.
- ARCEP and SpaceX did not respond to a request for comment.
- ARCEP’s “contested decision” to authorize Starlink “is likely to have a significant impact on the market for the supply of high-speed internet access and affect the interests of end users,” Conseil d’État said, and therefore should have first consulted the public.
- The ruling came after Priartem and Agir Pour L’Environnement, two French environmental activist organizations, submitted an appeal to challenge ARCEP’s decision to award Starlink frequency rights.
- Stéphen Kerckhove, managing director of Agir pour l’Environnement (Acting for the Environment), called for stronger regulations on megaconstellations to protect views of the night sky and reduce space debris risks in an April 6 statement.
• February 9, 2022: NASA says that SpaceX’s proposal for a second-generation Starlink constellation with 30,000 satellites could lead to a “significant increase” in potential collisions in low Earth orbit and interfere with the agency’s launches and scientific activities. 8)
Figure 5: A set of first-generation Starlink satellites being launched. The proposed second-generation Starlink system, with 30,000 satellites, could raise the risk of collisions and interfere with science missions, NASA says (image credit: SpaceX)
- The five-page letter was submitted to the Federal Communications Commission Feb. 8 on NASA’s behalf by the National Telecommunications and Information Administration (NTIA), along with a separate one-page letter from the National Science Foundation (NSF). The letter was submitted to the FCC’s proceedings on SpaceX’s proposal for its Starlink “Gen 2” system with approximately 30,000 satellites in LEO.
- “With the increase in large constellation proposals to the FCC, NASA has concerns with the potential for a significant increase in the frequency of conjunction events and possible impacts to NASA’s science and human spaceflight missions,” stated the letter, signed by Samantha Fonder, NASA’s representative to the Commercial Space Transportation Interagency Group. “NASA wants to ensure that the deployment of the Starlink Gen 2 system is conducted prudently, in a manner that supports spaceflight safety and the long-term sustainability of the space environment.”
- The letter raised several issues about the proposed constellation, primarily because it would increase the number of tracked objects in low Earth orbit by more than a factor of five. “An increase of this magnitude into these confined altitude bands inherently brings additional risk of debris-generating collision events based on the number of objects alone,” the agency stated. “NASA anticipates current and planned science missions, as well as human space flight operations will see an increase in conjunctions.”
- NASA questioned whether the automated collision avoidance system SpaceX developed for its current Starlink satellites will scale to the larger Gen 2 system. “NASA recommends SpaceX generate analysis demonstrating the auto-maneuver capability is sufficiently scalable to the entire proposed constellation size, including inter-constellation conjunctions, while accounting for challenges in flying lower altitudes during greater solar activity,” the letter stated.
- Other constellations that also have autonomous collision avoidance capabilities could cause problems if one of those satellites attempts to avoid a Starlink satellite, triggering a series of maneuvers that could increase, rather than decrease, the risk of a collision unless there are “rules of the road” governing such interactions. NASA recommended SpaceX perform a risk analysis of such events.
- Beyond the risk of collisions with NASA and other satellites, the agency said the Starlink Gen 2 system could interfere with science missions. Those satellites will be in orbits below most NASA Earth science satellites and could create reflections of sunlight that interfere with those satellites’ instruments. The Gen 2 constellation could double the number of Hubble Space Telescope images that contain satellite streaks, currently 8% of all images.
- The constellation would also risk interfering with ground-based astronomy, in particular observations of near Earth objects as part of NASA’s planetary defense program. With the Gen 2 system, the letter stated, “NASA estimates that there would be a Starlink in every single asteroid survey image taken for planetary defense against hazardous asteroid impacts, decreasing asteroid survey effectiveness by rendering portions of images unusable.”
- The Starlink constellation interferes with launches as well. NASA said about 20,000 Starlink satellites would be in orbits below the International Space Station, complicating launches of cargo and crew missions. “NASA is also concerned with an increasing unavailability of safe launch windows, especially for missions requiring instantaneous or short launch windows,” citing the upcoming Europa Clipper mission as one example.
- NASA did not state in the letter it was opposed to an FCC license for Starlink Gen 2, instead highlighting areas SpaceX needs to address. “NASA appreciates SpaceX’s collaboration and partnership in addressing conjunction concerns to date,” it stated. “The proposed increase in the number of Starlink spacecraft on orbit will require expanded coordination and communication between the two parties to ensure the continued safety of both SpaceX and NASA assets.”
- SpaceX did not immediately respond for a request for comment about the NASA letter and its recommendations. The company infrequently responds to media inquiries.
- NASA added that it “has provided similar comments in response to other proposed large constellations.” That includes a letter last year regarding a planned constellation by AST SpaceMobile, where NASA raised concerns about the risk of collisions posed by those satellites with very large antennas. The company has since said it will reduce the size of those antennas.
- Mark Dankberg, executive chairman of Viasat, discussed the letter with Jim Bridenstine, former NASA administrator, during a “fireside chat” at the SmallSat Symposium here Feb. 9.
- Dankberg, a critic of Starlink but who did not mention SpaceX by name at the event, outlined the various issues NASA raised in the letter, seeing them as costs being imposed on the agency. “There are all of these costs that are being externalized.”
- Bridenstine, who serves on the board of directors of Viasat, agreed. “The challenge that I had at NASA is becoming a lot bigger,” he said of past concerns about space sustainability he raised during his time as agency administrator.
- He added that the constellation is just one of many proposed by companies and countries. “This is true for every constellation that we’re going to see coming up in the future in how it impacts NASA, which, of course, impacts the American taxpayer,” he said. “This is a real challenge that I don’t think is getting the attention that it needs as we move forward.”
• January 19, 2022: Pakistan has followed India in ordering SpaceX to stop taking preorders for Starlink broadband services within its borders without a license. 9)
- The Pakistan Telecommunication Authority (PTA) said in a Jan. 19 news release that “Starlink has neither applied for nor obtained any license from PTA to operate and provide internet services” in the country.
- The telecoms regulator advised the general public to refrain from pre-booking the service in Pakistan through Starlink or associated websites.
- “The directions came in the wake of reports that Starlink, through its website, is asking intended subscribers to pay a deposit of USD 99 (refundable) as pre-order for equipment/services,” PTA said.
- “PTA has already taken up the matter with Starlink to stop taking pre-order bookings from intended consumers with immediate effect as the Company has not been granted any license for provision of internet services in Pakistan.”
- The website appeared to remain open to Indian addresses in the days that followed a similar public announcement Nov. 26 from India’s government, which also called on the company to stop taking preorders until Starlink has a license to operate in the country.
- However, addresses in India now tell prospective subscribers that Starlink is unavailable “due to pending regulatory approval” instead of processing a preorder.
- Starlink’s lead executive in India announced Jan. 4 that he had resigned for personal reasons, hours after Reuters, TechCrunch and others reported that SpaceX emailed customers in India to say preorder deposits would be refunded until Starlink is licensed to operate there.
- Meanwhile, SpaceX is pressing ahead with an aggressive deployment schedule to build out global coverage, launching Jan. 18 a batch of 49 Starlink satellites on a Falcon 9 rocket to low Earth orbit (LEO).
- According to statistics kept by astrophysicist and spaceflight analyst Jonathan McDowell, the launch means SpaceX is operating 1,879 Starlink satellites in LEO. The company is authorized to operate 4,408 satellites at around 550 kilometers.
- More than 750,000 people worldwide have preordered the satellite internet services, according to Starlink.
- Separately, SpaceX is seeking U.S. Federal Communications Commission approval for a second-generation network of nearly 30,000 satellites to improve Starlink’s services.
• January 4, 2022: Starlink’s lead executive in India said he resigned Friday for personal reasons, a month after the country’s government ordered SpaceX to stop preselling the satellite broadband service until it gives regulatory approval. 10)
- “I have stepped down as Country Director and Chairman of the Board of Starlink India for personal reasons,” Sanjay Bhargava said in a Jan. 4 LinkedIn post.
- “My last working day was December 31, 2021. I will have no comments for individuals and media so please respect my privacy.”
- Bhargava started the role Oct. 1, when he said preorders in India had crossed the 5,000 mark, amid a “stretch target” to have 200,000 Starlink terminals active in December 2022.
- However, India’s Ministry of Communications issued a Nov. 26 statement instructing SpaceX to “refrain from booking/rendering” Starlink services “with immediate effect” because the company did not have a license to operate in the country.
- In the days that followed, SpaceX appeared to be still accepting $99 preorder deposits via Starlink’s website for addresses in India.
- But the website now tells prospective subscribers: “Starlink is not yet available in your area due to pending regulatory approval. As we receive approvals our coverage area will continue to expand, so please check back for future availability in your area.”
- In a LinkedIn message written one month ago, Bhargava said: “We hope to have applied for a commercial license on or before 31st January 2022 (unless we hit some major roadblock).”
- Hours before Bhargava announced his resignation, Reuters, TechCrunch and others reported that SpaceX emailed customers in India to say that preorder deposits would be refunded until Starlink is licensed to operate in the country.
- “Unfortunately, the timeline for receiving licences to operate is currently unknown, and there are several issues that must be resolved with the licensing framework to allow us to operate Starlink in India,” SpaceX said in a Jan. 4 email, according to Reuters.
- SpaceNews has not independently confirmed the email. SpaceX and India’s Ministry of Communications did not immediately respond to SpaceNews’ request for comment.
- SpaceX has launched nearly 1,950 Starlink satellites to low Earth orbit to date, of which about 1,800 are in orbit.
- The company is reportedly planning to launch its latest batch of Starlink satellites on a Falcon 9 rocket Jan. 6 from NASA’s Kennedy Space Center in Florida.
- Starlink recently said more than 750,000 people worldwide have preordered its services.
• November 29,2021: India’s government has told SpaceX to stop taking preorders for Starlink broadband services in the country until it has a license to operate there. 11)
- India’s Ministry of Communications issued a Nov. 26 statement instructing SpaceX to “refrain from booking/rendering the satellite internet services in India with immediate effect.”
- SpaceX, which appeared as of Nov. 29 to still be accepting $99 preorder deposits via Starlink’s website for addresses in India, did not respond to SpaceNews about the Indian government’s public advisory.
- Preorders from the country had crossed the 5,000 mark by the start of October, Sanjay Bhargava said Oct. 1 in a LinkedIn post on his first day as Starlink’s head of India.
- He said Starlink’s “stretch target” is to have 200,000 Starlink terminals active in India in December 2022, although “[a]ctual numbers may be much lower than that or even zero if we do not get government approval” for the services.
- The “government approval process is complex,” stated a document Bhargava shared through the LinkedIn post, which said Starlink had yet to file an application with the Indian government at the time.
- A month later, Bhargava said in a separate LinkedIn post that SpaceX had incorporated a wholly owned subsidiary in India on Nov. 1 called Starlink Satellite Communications Private Limited (SSCPL).
- “We can now start applying for licenses, open bank accounts etc.,” he said.
- Bhargava praised the country’s Ministry of Corporate Affairs for an “incredibly fast” incorporation process — less than four weeks before India’s Ministry of Communications would slam the brakes on presales.
- “If we do get licensed fast as well it will really help in showing the world that ease of doing business is very high in India if you understand the system and work in national interest,” Bhargava said in the early November LinkedIn post.
- However, even in countries where Starlink has licenses to operate, pandemic-related supply chain issues have been slowing down Starlink’s product deployments.
- SpaceX told preorder customers in a Nov. 23 email that silicon shortages over the last six months have slowed the company’s expected production rate, impacting its ability “to fulfill many Starlink orders this year.”
- SpaceX has launched more than 1,800 Starlink satellites to date, and recently said over 750,000 people worldwide have preordered its services.
- About 140,000 users worldwide are using Starlink, SpaceX told the U.S. Federal Communications Commission in a Nov. 10 filing.
- “Over 14 million people have inquired about Starlink service in their area and today Starlink is available in over 20 countries (and counting),” SpaceX said in the Nov. 23 email.
- SpaceX has scheduled its next Starlink launch for Dec. 1 from Cape Canaveral, Florida, breaking the record for the most Falcon 9 flights in a year.
• August 26, 2021: SpaceX is adding laser terminals on all future Starlink satellites and is the reason behind a break in launches for the broadband megaconstellation, president and chief operating officer Gwynne Shotwell said. 12)
- Shotwell told the Space Symposium Aug. 24 that its decision to add laser crosslinks, enabling the satellites to communicate with each other to reduce their reliance on ground stations, is “why we have been struggling” to launch a Starlink mission since June 30.
- SpaceX had been conducting an aggressive launch campaign with its Falcon 9 rocket throughout the first half 2021 before the hiatus, enlarging the Starlink constellation to more than 1,600 satellites in low Earth orbit.
- Typically, each Falcon 9 launch for the network has placed 60 Starlink satellites at a time. There were four Starlink launch missions this May alone.
- SpaceX has regulatory permission to operate 4,408 satellites at 550-kilometers altitude for global coverage.
- Shotwell said the next Starlink launch will be in “roughly three weeks.”
- SpaceX launched 10 Starlink satellites with laser crosslinks to polar orbit in January, its first with the capability, so it did not need ground stations over the poles.
- By enabling communications from one satellite to another on the same or adjacent orbital plane, a ground station does not have to be in the same satellite footprint as user terminals.
- As well as reducing the number of ground stations needed for global coverage, laser crosslinks links can also lower latency because they reduce the number of hops between satellites and ground stations.
- The price of user terminals remains a challenge for SpaceX, which is heavily subsidizing them. Shotwell told the conference that SpaceX continues to lose money on user terminals with every customer it acquires, because their cost is higher than the average user can afford.
- “We were able to tackle almost all of the elements of the cost before we rolled out service, with the exception of the user terminal,” she said.
- She said the company is on track to reduce the cost of its user terminals, which are priced to consumers at $499, by roughly half before the end of this year.
- “And then we think we’ll be able to cut that in half yet again,” she added.
- However, she pointed to a global lack of semiconductors that has “delayed the new user terminals,” and a shortage of liquid oxygen that is posing other challenges for the launch side of its business.
• June 1, 2021: Satellite operator Viasat is stepping up efforts to stop Starlink’s growing constellation, taking aim at the nearly $900 million of rural broadband subsidies that SpaceX won in December. 13)
Figure 6: SpaceX launched four batches of Starlink satellites across four separate missions in May 2021 (image credit: SpaceX)
- The operator is asking the Federal Communications Commission (FCC) to review decisions made around the Rural Digital Opportunity Fund (RDOF), claiming differential treatment and a lack of transparency.
- Viasat initially filed its AFR with the FCC Jan. 29, on a confidential basis, to review why it was not permitted to bid for the subsidies with its proposed low Earth orbit constellation, despite already operating broadband satellites in geostationary orbit.
- Mark Dankberg, Viasat’s co-founder and executive chair, outlined a LEO constellation of nearly 300 satellites in May 2020, operating higher than Starlink’s current network at 1,300 kilometers. SpaceX currently operates more than 1,600 Starlink satellites at about 550-kilometers, where it is licensed to deploy around 4,400 in total.
- According to Viasat, decisions made by the FCC’s Rural Broadband Auctions Task Force, Office of Economics and Analytics and Wireline Competition Bureau “improperly discriminate against Viasat and treat it in a fundamentally different fashion than” SpaceX.
- In a June 1 letter to FCC acting chair Jessica Rosenworcel, Viasat added that “this disparate treatment has continued after the end of” RDOF’s Phase 1 auction.
- “Among other things, the Bureaus have suggested that there is an overarching need for transparency with respect to the Commission’s ongoing review of whether Viasat was in fact eligible to participate in Auction 904 and ultimately win RDOF support,” it wrote.
- “However, the Bureaus have seemingly abandoned their commitment to transparency in the case of SpaceX — which is poised to receive approximately $885 million in RDOF support even though there are significant doubts about its ability to satisfy its RDOF performance obligations.”
- In a separate document filed with the FCC June 1, Viasat detailed analysis it says shows Starlink will be unable to meet the coverage and capacity commitments that SpaceX made to secure RDOF funding.
- Viasat cited suggestions from SpaceX that technological advances will enable it to overcome any issue, but said relying on unproven upgrades conflicts with the FCC’s RDOF framework.
- SpaceX was unable to comment before this article was published.
- SpaceX’s share of the $9.2 billion awarded in total under RDOF’s Phase 1 auction was one of the largest among 180 successful bidders. Hughes Network Systems was the only other satellite provider to win funds from the auction, securing under $1.3 million.
- RDOF Phase 1 subsidies will be distributed to successful bidders over the next 10 years to connect around 5.2 million unserved homes and businesses with broadband in rural parts of the United States. Under SpaceX’s Phase 1 commitments, Starlink has to provide high-speed internet services to nearly 643,000 homes and businesses in 35 states.
- “We believe the FCC did not act in complete transparency or fairness and applied fundamentally different standards to similarly situated satellite operators,” John Janka, Viasat’s chief officer of government and regulatory affairs, said in an emailed statement.
- “We think it is reasonable to expect U.S. government agencies to uphold the highest principles and, to ensure parity in competition — especially in connection with a program that will distribute billions of taxpayer dollars.”
Stopping on environmental grounds
- Viasat is set to head to court June 2 in an effort to stop SpaceX from launching more Starlink satellites on environmental grounds.
- The Carlsbad, California-based company recently gave the FCC until the end of June 1 to stay an April 27 license modification, which has been enabling SpaceX to continue building out the constellation at an altitude of around 550-kilometers.
- If the FCC does not grant a stay order, Viasat intends to seek one from the United States Court of Appeals for the District of Columbia Circuit.
- That is the same court where Viasat intends to argue that the FCC was legally obligated to thoroughly assess Starlink’s environmental impact before approving the license modification.
- If the FCC does not grant a stay order, Viasat intends to seek one from the United States Court of Appeals for the District of Columbia Circuit.
- That is the same court where Viasat intends to argue that the FCC was legally obligated to thoroughly assess Starlink’s environmental impact before approving the license modification.
- Five days after Viasat called on the FCC May 21 to stay Starlink’s license modification, SpaceX launched another batch of 60 satellites to expand the constellation at 550-kilometers.
- Before the modification, SpaceX was only permitted to operate 1,584 satellites at 550-kilometers, with permission for 2,825 more in orbits of 1,100 to 1,300-kilometers.
• April 27, 2021: The Federal Communications Commission (FCC) approved a modification of SpaceX’s license for its Starlink constellation, allowing the company to operate more than 2,800 additional satellites in lower orbits. 14)
- In an order and authorization published April 27, the FCC said it will allow SpaceX to move 2,814 satellites from orbits in the range of 1,100 to 1,300 kilometers to 540 to 570 kilometers. That is the same orbital range that the company is using for its current constellation of about 1,350 satellites in operation today.
- The agency rejected efforts by several companies, including others planning low Earth orbit constellations and those operating geostationary satellite systems, to block the modification or force SpaceX to be considered in a new round of proposed systems, losing its priority.
- “Our action will allow SpaceX to implement safety-focused changes to the deployment of its satellite constellation to deliver broadband service throughout the United States, including to those who live in areas underserved or unserved by terrestrial systems,” the FCC said.
- Under the approval, the size of the Starlink constellation will decrease by one satellite, from 4,409 to 4,408. That includes the 1,584 satellites previously authorized to operate at orbits of 550 kilometers at inclinations of 53 degrees, and 10 authorized in January to operate in polar orbits. They will be joined by 2,814 satellites, previously approved for higher orbits, operating at inclinations of 53.2, 70 and 97.6 degrees and at latitudes between 540 and 570 kilometers.
- SpaceX’s proposal was the subject of intense debate at the FCC, with nearly 200 filings submitted. Many satellite operators opposed the modification on grounds ranging from increased electromagnetic interference to a greater risk of satellite collisions and creation of orbital debris.
- The FCC, by and large, rejected those claims. “Based on our review, we agree with SpaceX that the modification will improve the experience for users of the SpaceX service, including in often-underserved polar regions,” the order states. “We conclude that operations at the lower altitude will have beneficial effects with respect to orbital debris mitigation. We also find that SpaceX’s modification will not present significant interference problems, as assessed under Commission precedent.”
- In particular, it concluded that allowing SpaceX to operate more satellites in that lower orbit would not, in the aggregate, harm the orbital environment. Some companies, such as Viasat, had argued that Starlink satellites suffered a high failure rate that threatened to increase the risk of collisions in LEO.
- “SpaceX’s satellite failure rate is a matter of significant contention in the record,” the FCC noted, alluding to back-and-forth filings on the issue in recent months by SpaceX, Viasat and others. The FCC noted that, according to SpaceX, the company had suffered a “disposal failure rate” of 1.45%, and that 720 of the last 723 satellites launched (as of mid-February 2021) were maneuverable after launch.
- FCC said that “it will be important for SpaceX to maintain a high disposal reliability rate for its satellites in order to limit collision risk.” As a condition of the modified license, SpaceX must file semiannual reports on the number of “conjunction events” and those that required a maneuver to avoid a collision, as well as satellites that the company has disposed. SpaceX would also have to file reports if there are three or more disposal failures in any one-year period.
- The order requires SpaceX to operate its Starlink satellites at altitudes no higher than 580 kilometers. That was a condition requested by Amazon to avoid close approaches to its Project Kuiper satellites, and one SpaceX had stated in filings that it would accept.
- The FCC, as part of the order, also rejected requests that the agency perform an environmental assessment as part of the National Environmental Policy Act (NEPA). Some astronomers had also proposed that Starlink be subject to an environmental assessment, or EA, because of the impacts that the satellites have on astronomical observations.
- The FCC concluded that “the issues raised in the filings do not warrant preparation” of an environmental assessment. It offered several reasons for rejecting those requests, from the fact that the Federal Aviation Administration does its own environmental assessments for launches of Starlink satellites to “whether NEPA covers sunlight as a source of ‘light pollution’ when reflecting on a surface that is in space.”
- However, the FCC urged SpaceX to continue to work closely with astronomers to mitigate the brightness of its satellites. “Although we do not find that the record before us merits preparation of an EA under NEPA, we conclude that it nonetheless would serve the public interest under the Communications Act for SpaceX to ensure that it does not unduly burden astronomy and other research endeavors,” it stated. “Accordingly, we will continue to monitor this situation and SpaceX’s efforts to achieve its commitments in this record.”
- Viasat, which strongly opposed the SpaceX modification request, had a mixed reaction to the FCC decision. “We are pleased the Commission confirmed that Starlink satellites must be reliable and safe, and also recognized the need to assess the cumulative (aggregate) collision risk presented by the entire Starlink constellation,” John Janka, chief officer for global regulatory and government affairs at Viasat, said in a statement to SpaceNews.
- “This is a positive outcome that places clear conditions on SpaceX, including requirements that it remain below 580 km and accept additional interference resulting from its redesign,” an Amazon spokesperson told SpaceNews. “These conditions address our primary concerns regarding space safety and interference, and we appreciate the Commission’s work to maintain a safe and competitive environment in low earth orbit.”
- SpaceX did not issue a statement about the FCC’s decision, but in a tweet, SpaceX Chief Executive Elon Musk called the FCC “fair & sensible.”
• April 15, 2021: SpaceX has added more than $300 million to a fundraising round announced earlier this year to support continued work on its Starship launch system and Starlink satellite constellation. 15)
Figure 7: SpaceX President Gwynne Shotwell said April 14 that she expects the company’s Starship vehicle to be carrying “large numbers of people” to space, including to the moon, within five years (image credit: SpaceNews/Brian Berger)
- In an amended filing with the U.S. Securities and Exchange Commission April 14, the company revised a filing in February that disclosed raising $850 million. The company says it has now raised $1.164 billion.
- SpaceX raised $1.9 billion in its previous funding round in August 2020. It has raised more than $6 billion in equity to date.
- Much of that investment has gone to support two high-profile, and high-expense, projects SpaceX is pursuing. One is the Starlink constellation of broadband internet satellites the company is currently deploying, with about 1,350 satellites currently operational.
- In an April 14 talk at the SpaceTech conference by the Massachusetts Institute of Technology’s Department of Aeronautics and Astronautics, Gwynne Shotwell, president and chief operating officer of SpaceX, reiterated comments she made earlier this month that the company will soon have enough satellites in orbit to provide global coverage.
- “With Starlink, we anticipate having full global connectivity, consistent global connectivity, a few months after our 28th ,” she said, a milestone she anticipated reaching “late this year.” An April 7 launch was the 23rd of the company’s v1.0 Starlink satellites. “We will continue to add capacity with additional satellites after that. We will continue to improve our technology, and basically get more beams on the ground.”
- Among those technology improvements is the incorporation of laser intersatellite links. Shotwell said the company has already tested two generations of that technology on some of its satellites. “The first ones that we flew were very expensive. The second round of technology that we flew was less expensive,” she said.
- A third generation of laser intersatellite links will start flying “in the next few months,” she said. She didn’t elaborate on those plans, but it’s likely those will be included on satellite the company is preparing to launch to polar orbits. The new technology, she said, will be able to operate over longer distances and provide high bandwidth, while being “much less expensive” than earlier versions.
- SpaceX’s other capital-intensive project is its Starship launch system. The company has flown, and destroyed, four Starship prototypes on suborbital test flights in recent months, most recently March 30. A new Starship prototype, SN15, recently arrived on the launch pad at SpaceX’s Boca Chica, Texas, test site for a flight test that could happen as soon as late this month.
- “Starship is an amazing machine. I could not be more excited about a vehicle than I am about Starship,” Shotwell. “That is the vehicle that will take people in great numbers to the moon, to Mars.”
- Despite a test campaign that has so far been filled with vehicle explosions, she remained optimistic that the vehicle will be ready to fly people within several years. “I believe we will be flying large numbers of people on Starship in five years,” she said, including point-to-point transportation between two locations on Earth, a concept SpaceX first discussed in 2017.
- Asked by Dava Newman, an MIT professor and former NASA deputy administrator, if that meant SpaceX would be ready to send people to Mars by 2030 to 2035, Shotwell offered a more aggressive schedule. “We’re shooting for before 2030. It might end up taking that long, but I hope not,” Shotwell said.
- That timeline, she said, was based on the experience she expected the company to build up flying people on point-to-point and lunar Starship missions. “You’re flying enough where you hopefully have enough knowledge of the system and knowledge of risk that you can definitely start the journey to Mars within the next five years.”
- “I recognize,” she added, “we never make our timelines, so they’re aspirational. But you have to aim high.”
• March 18, 2021: NASA and SpaceX have signed a joint agreement to formalize both parties’ strong interest in the sharing of information to maintain and improve space safety. This agreement enables a deeper level of coordination, cooperation, and data sharing, and defines the arrangement, responsibilities, and procedures for flight safety coordination. The focus of the agreement is on conjunction avoidance and launch collision avoidance between NASA spacecraft and the large constellation of SpaceX Starlink satellites, as well as related rideshare missions. A conjunction is defined as a close approach between two objects in space, usually at very high speed. 16)
- “Society depends on space-based capabilities for global communications, navigation, weather forecasting, and much more,” said acting NASA Administrator Steve Jurczyk. “With commercial companies launching more and more satellites, it’s critical we increase communications, exchange data, and establish best practices to ensure we all maintain a safe space environment.”
- The Starlink spacecraft are equipped with global navigation satellite service receivers to estimate orbital parameters, an ion propulsion system, and an autonomous maneuvering capability that provide data for prompt and proactive exchange of information. Both NASA and SpaceX benefit from this enhanced interaction by ensuring all parties involved are fully aware of the exact location of spacecraft and debris in orbit.
- SpaceX has agreed its Starlink satellites will autonomously or manually maneuver to ensure the missions of NASA science satellites and other assets can operate uninterrupted from a collision avoidance perspective. Unless otherwise informed by SpaceX, NASA has agreed to not maneuver its assets in the event of a potential conjunction to ensure the parties do not inadvertently maneuver into one another.
- In addition to this agreement, NASA is supporting growth in the U.S. commercial space sector through the release of the “Spacecraft Conjunction Assessment and Collision Avoidance Best Practices Handbook,” which the agency issued in December 2020 to improve global awareness of space activity and to share NASA lessons learned regarding close approach coordination and mitigation. The handbook is available at: https://go.nasa.gov/34f9ijM
• October 27, 2020: SpaceX has launched public beta testing of its Starlink communications satellite program that aims deliver high-speed Internet globally, particularly in underserved areas. 17)
- The Elon Musk-founded aerospace manufacturer sent out emails to invite people who signed up on its Starlink website to hear updates about the program.
- The initial Starlink service is called "Better Than Nothing Beta," according to multiple screenshots of an email, CNBC (Consumer News and Business Channel) reported.
- Joining the public beta test costs $99 a month on top of a $499 upfront cost for the ground equipment, which includes a user terminal to connect to the satellites, a mounting tripod and a Wi-Fi router.
- SpaceX also has a Starlink app listed on the Google Play and Apple iOS app stores, which helps users set up their systems and allows them to search areas of the sky for unobstructed views.
- "As you can tell from the title, we are trying to lower your initial expectations," the Starlink Team signed email said. "Expect to see data speeds vary from 50 Mb/s to 150 Mb/s and latency from 20 ms to 40 ms over the next several months as we enhance the Starlink system. There will also be brief periods of no connectivity at all."
- SpaceX said that "nearly 700,000" individuals across the United States had expressed interest in potentially subscribing to the service.
- "Under Starlink's Better Than Nothing Beta program, initial service is targeted for the U.S. and Canada in 2020, rapidly expanding to near global coverage of the populated world by 2021," SpaceX said in the description of its Starlink mobile app.
- The company rolled out private beta testing over the summer for which users had to agree to keep their experience confidential.
- "You may NOT discuss your participation in the Beta Program online or with those outside or your household, unless they are SpaceX employees," the Starlink website said.
- SpaceX said the network will cost about $10 billion or more to build, but the company's leadership estimates that it could bring in up to $30 billion a year, which is more than 10 times the annual revenue of its rocket business.
- On Saturday (24 October 2020), SpaceX launched its Falcon 9 rocket into space, carrying 60 Internet satellites into orbit to help establish connections to remote areas.
- Earlier this month, Musk tweeted that Starlink's constellation had grown large enough to begin beta-testing the Internet service system in the United States and southern Canada.
- The company has launched nearly 900 Starlink satellites to date, which is only a fraction of what's needed for global coverage, but enough to provide service in some areas.
• October 21, 2020: Microsoft and SpaceX announced a partnership Tuesday that would marry the tech leader's Azure computing system with space company's Starlink satellite Internet service. 18)
- Through Starlink, SpaceX plans to use thousands of satellites that would provide high-speed Internet anywhere on Earth. Microsoft's Azure would connect those satellite to the cloud storage.
- "The collaboration that we're announcing will allow us to work together to deliver new offerings for both the public and the private sector to deliver connectivity through Starlink for use on Azure," SpaceX President Gwynne Shotwell said in a video. "Where it makes sense, we will work with [Microsoft]: co-selling to our mutual customers, co-selling to new enterprise and future customers."
- Tom Keane, corporate vice president of Microsoft's Azure Global, said with the space community rapidly growing, new technologies have made connectivity and computing in space more attainable for private and public entities. He said such innovations can be used to benefit a wide range of fields from agriculture, energy, telecommunications and government.
- The Microsoft-SpaceX partnership will connect Starlink's network to Microsoft data centers around the world. Microsoft said it will mostly be used for customers "who need cloud computing capabilities in hybrid or challenging environments, including remote areas."
- "Resilient satellite communications, coupled with Azure's ability to provide high-performance computing, machine learning and data analytics opens many new opportunities for both public- and private-sector organizations," Keane said.
- "Our partnership approach to satellite communication solutions helps us bring these capabilities to customers faster to help solve their mission-critical space needs," he said.
• March 23, 2020: SpaceX has secured the approval of the Federal Communications Commission (FCC) to deploy up to a million ground antennas for its Starlink satellite constellation project. Previously, the company’s founder Elon Musk referred to the antenna as “a UFO on a stick.” 19)
- SpaceX recently came from the successful launch of its sixth batch of Starlink satellites. It is part of the company’s impressive project to deliver high-speed internet from space.
- Recently, the company was able to secure a key government license to begin rolling out another important feature of its Starlink project. According to federal documents filed by the company, the FCC has given SpaceX approval release about a million antennas that are designed to work with the Starlink satellites.
- According to the company, the antennas are designed to connect users to SpaceX’s network of satellites. Measuring at about 19 inches across, Musk noted that the antennas look like small UFOs. The SpaceX founder also said these devices are very easy to install and use.
- “It looks like a UFO on a stick,” he said according to CNBC. “It’s very important that you don’t need a specialist to install. The goal is for ... just two instructions and they can be done in either order: Point at sky, plug in.”
- SpaceX’s first batch of Starlink satellites was official deployed in May last year. Since then, the company has been regularly carrying out launches for new batches of satellites. Currently, there around 360 Starlink units operating in low-Earth orbit. The launch for the next batch of satellites is scheduled to take place next month.
- Originally, SpaceX planned to deploy a total of 12,000 satellites for its Starlink project. However, documents filed by the company last year revealed that SpaceX was planning to launch an additional 30,000 satellites. Once completed, the entire project could be comprised of about 42,000 satellites.
- As noted by the company, the massive satellite constellation will enable telecommunication companies to provide internet services to customers residing in remote and hard-to-reach regions in different parts of the globe.
- “With performance that far surpasses that of traditional satellite internet, and a global network unbounded by ground infrastructure limitations, Starlink will deliver high-speed broadband internet to locations where access has been unreliable, expensive, or completely unavailable,” SpaceX explained in a statement.
• January 17, 2020: SpaceX plans to launch its next group of Starlink broadband satellites aboard a Falcon 9 rocket as soon as Tuesday, Jan. 21, from Cape Canaveral, two days after the company is scheduled to launch a modified Falcon 9 booster from a separate facility at the Florida spaceport to test the Crew Dragon spaceship’s emergency escape system. 20)
- SpaceX’s ability to achieve back-to-back launch schedule hinges on several factors, including an expected test-firing in the coming days of the Falcon 9 booster slated to fly on the next Starlink launch.
- The Starlink mission — SpaceX’s fourth launch dedicated to the broadband network — was previously scheduled for Monday, Jan. 20. But sources said Friday the launch was pushed back to Jan. 21.
• January 8, 2020: SpaceX says it’s committed to working with the astronomy community to address the brightness of its Starlink satellites, but some astronomers remain concerned about the deleterious effect that system and other megaconstellations will have on their field. 21)
- One of the 60 satellites in the latest Starlink launch Jan. 6 featured an experimental coating intended to reduce its brightness. SpaceX said it will see in the coming weeks how well those coatings work, as well as study any effects they have on the performance of the satellite itself, before deciding how to move forward.
- Cooper said that brightness is affected by several issues. The Starlink satellites initially appear bright when released in a lower parking orbit, and the configuration of each satellites’ single large solar array when raising its orbit can also influence its brightness. Once in a final operating orbit of 550 kilometers, the spacecraft brightness decreases to a visual magnitude of about five, making them visible to the naked eye only in darker night skies.
- One challenge, she said, is the unique design of the satellite made it difficult to determine exactly what causes the spacecraft to reflect so much light. “It turns out, we think, that surfaces that scatter light, or reflect light diffusely, are also significant contributors,” she said. That led to the testing of surfaces on the experimental satellite, nicknamed “DarkSat” by some, to reduce that reflectivity.
- While DarkSat is now in orbit, it will take some time to see how effective it is. Patrick Seitzer, an astronomer at the University of Michigan who is studying the effect of satellite constellations on optical astronomy, said at a later press conference that the satellite likely won’t reach its operational orbit until late February. “Then serious measurements can begin,” he said.
- Cooper said that SpaceX would work quickly to reduce the brightness of its satellites, but didn’t give a specific timetable or state if other experimental satellites are in the works. In the meantime, the company will continue to launch the original design of Starlink satellites that are designed to be operational for five years, a plan that some astronomers at the meeting criticized.
- “We don’t know yet if these mitigations are useful and effective,” she said. “We tend to work very quickly. We tend to test, learn and iterate.”
- SpaceX has been meeting with a committee of the AAS to discuss the astronomy community’s concerns about Starlink and to examine ways to mitigate them. That work has included a half-dozen teleconferences and an in-person meeting during this AAS conference, said Jeff Hall, director of Lowell Observatory and chair of the AAS committee.
- “We have not had to cajole SpaceX in any way. They’ve been very receptive and very proactive,” he said. Those discussions, he said, initially focused on SpaceX’s Starlink deployment plans, but more recently have been more just “keeping in touch” as SpaceX prepared to launch its experimental DarkSat.
- Hall added that it was premature to discuss regulations regarding satellite brightness. “Regulation of the Wild West up there is necessary, but that is going to take a great deal of time to implement,” he said, while the problem posed by Starlink and other constellations is a near-term issue that needs to be addressed now.
- Hall added that it was premature to discuss regulations regarding satellite brightness. “Regulation of the Wild West up there is necessary, but that is going to take a great deal of time to implement,” he said, while the problem posed by Starlink and other constellations is a near-term issue that needs to be addressed now.
- Hall and other astronomers said that, like SpaceX, they were surprised by how bright the Starlink satellites appeared. “What surprised everyone — the astronomy community and SpaceX — was how bright their satellites are,” Seitzer said. “We knew these tens of thousands of megaconstellations were coming, but based on the sizes and shapes of things currently in orbit, I thought they’d be maybe eighth or ninth magnitude. We were not expecting second or third magnitude.”
- Both astronomers and SpaceX said they hope, as an initial step to get the Starlink satellites dim enough to not be visible to the naked eye even in the darkest skies. The next step will be to figure out what else can be done to mitigate their effects on major observatories, specifically the Vera Rubin Observatory (formerly Large Synoptic Survey Telescope) under construction in Chile. Astronomers said that wide-field telescope was particularly threatened by Starlink and other megaconstellation satellites.
- Hall said his AAS committee plans to start discussions with OneWeb later this month, shortly before the company begins full-scale deployment of its constellation. Six OneWeb demonstration satellites are currently in orbit, at altitudes higher than SpaceX. Seitzer said the satellites, at about eighth magnitude, are too dim to be seen by the naked eye, but pose in some cases greater concerns to professional astronomers than Starlink satellites because, at their altitudes, they may be visible all night during the summer, rather than just around sunset and sunrise.
- With SpaceX seeking to deploy up to 1,500 Starlink satellites in 2020 alone, and with OneWeb and other constellations under development, astronomers warned this was a major issue to them. “The issue of megaconstellations and astronomy is a serious issue,” Seitzer said. “We have a very short time to deal with this issue.”
Figure 8: SpaceX says it's committed to reducing the brightness of its Starlink satellites, but while it works on that the company will continue to launch unmodified satellites (image credit: SpaceX)
• October 16, 2019: SpaceX wants spectrum access for nearly four times as many satellites as originally planned for its high-speed internet constellation, the company and a UN agency confirmed on 16 October. 22)
- On October 7, the US FCC (Federal Communications Commission) sent the Geneva-based ITU (International Telecommunication Union) 20 filings with each one asking permission for 1,500 satellites, the ITU's Alexandre Vallet, chief of space services department, told AFP (Agence France Presse).
- A SpaceX request for 12,000 satellites had already been approved. This new lot would add 30,000 to the network called Starlink.
- The ITU manages radio spectrum frequencies and satellite orbits around the world. The 20 new filings mentioned by the ITU official can be seen on its website.
- A SpaceX spokeswoman did not directly confirm that number but said the company "is taking steps to responsibly scale Starlink's total network capacity and data density to meet the growth in users' anticipated needs."
- The idea behind Starlink is that the network of mini-satellites will allow fast response time between user and internet provider.
- The grid created by all these satellites will be such that several of them will be in direct sight from any point on Earth.
- It says it will take 24 launches for the rest of the world to be covered.
- To put things into context, there are currently 2,100 active satellites orbiting our planet, out of 23,000 objects recorded. These can be rocket stages, inactive satellites, space junk and other things.
- The prospect of adding another 42,000 satellites to the skies is causing worries for two reasons.
- On one hand, astronomers fear these satellites will get in the way of telescope observations made from Earth.
- When a first group of satellites was launched, many astronomers reported seeing a string of bright lights. SpaceX says it is trying to make the base of the satellites black.
- The second problem is crowding of LEO (Low Earth Orbit), which is up to altitudes of 2,000 km.
- SpaceX has said that three of the first 60 satellites it placed in orbit were out of service a month after being deployed. The company says it has ways of "deorbiting" faulty satellites and keeping them from colliding with other satellites.
- But an incident last month showed these procedures are not yet fully effective.
- ESA (European Space Agency) had to modify the trajectory of its Aeolus satellite to avoid collision with a Starlink orbiter. This is a routine maneuver. However, ESA tried to contact SpaceX and got no answer because the latter did not see the message.
• May 11, 2019: SpaceX CEO Elon Musk has published the first official photo of the company’s near-final Starlink design and confirmed that Falcon 9 will launch a staggering 60 satellites into orbit. 23)
- Known internally as Starlink v0.9, this mission will not be the first launch of operational satellites, but it will be the first internal SpaceX mission with a dedicated Falcon 9 launch. Additionally, the payload will be the heaviest yet launched by SpaceX, signifying an extraordinarily ambitious first step towards realizing the company’s ~12,000-satellite Starlink megaconstellation.
- Put simply, SpaceX’s Starlink v0.9 launch is extremely unique for several reasons. Aside from the unprecedented step of launching 60 spacecraft weighing ~13,000 kg on a developmental mission, both the form factor of each satellite and the style of dispenser/payload adapter has never been seen before. SpaceX appears to have settled on a square dispenser with four separate quadrants for satellites. The satellites themselves look truly bizarre – it’s actually difficult to discern where one spacecraft stops and the next begins.
- Nevertheless, it appears that each Starlink satellite is a relatively thin rectangle, possibly with a squared top and bottom. It’s also possible that they are all around rectangular and that the dispenser instead has two main sections. Either way, the very fact that the Starlink v0.9 payload can scarcely be parsed into recognizable satellites is thrilling. Aside from the rise of smallsats and cubesats, satellite design and engineering has been relatively stagnant for decades, particularly with respect to form factors and structural layouts. Most modern satellites are simply squarish boxes with electronics inside and payloads bolted on the outside.
- Despite using the same exact Falcon fairing that has been standard for years, SpaceX has managed to cram 60 spacecraft – each weighing around 227 kg into just the bottom two-thirds of the fairing, leaving a considerable amount of unused volume for future expansion.
- According to President and COO Gwynne Shotwell, Starlink v0.9 satellites are extremely close to SpaceX’s true final design. However, they are still considered by SpaceX to be a “test batch” of satellites and do not have the optical (laser) interlinks that will be a critical part of Starlink’s unique constellation design.
Figure 9: The second phase of Starlink testing – 60 advanced satellites – stacked in a single fairing (image credit: SpaceX)
- The regulatory commission approved SpaceX’s proposal Friday to fly more than 1,500 of its Starlink satellites at an altitude of 550 km, instead of the 1,150 km orbit originally planned.
- “This approval underscores the FCC’s confidence in SpaceX’s plans to deploy its next-generation satellite constellation and connect people around the world with reliable and affordable broadband service,” said Gwynne Shotwell, SpaceX’s president and chief operating officer. “Starlink production is well underway, and the first group of satellites have already arrived at the launch site for processing.”
• April 8, 2019: SpaceX has announced a launch target of May 2019 for the first batch of operational Starlink satellites in a sign that the proposed internet satellite constellation has reached a major milestone, effectively transitioning from pure research and development to serious manufacturing. 25)
- R&D will continue as SpaceX Starlink engineers work to implement the true final design of the first several hundred or thousand spacecraft, but a significant amount of the team’s work will now be centered on producing as many Starlink satellites as possible, as quickly as possible. With anywhere from 4400 to nearly 12,000 satellites needed to complete the three major proposed phases of Starlink, SpaceX will have to build and launch a minimum of ~2200 satellites in the next five years, averaging 37 high-performance, low-cost spacecraft built and launched every month for the next 60 months.
- Despite the major challenges ahead of SpaceX, things seem to be going quite smoothly with the current mix of manufacturing and development. As previously reported on Teslarati, SpaceX CEO Elon Musk forced the Starlink group through a painful reorganization in the summer of 2018, challenging the remaining leaders and their team to launch the first batch of operational Starlink satellites no later than June 2019. As a consequence, a sort of compromise had to be reached where one additional group of quasi-prototype satellites would be launched before settling on a truly final design for serious mass-production.
- According to SpaceX filings with the FCC, the first group of operational satellites – potentially anywhere from 75 to 1000 or more – will rely on just one band (“Ku”) for communications instead of the nominal two (“Ku” and “Ka”), a change that SpaceX says will significantly simplify the first spacecraft. By simplifying them, SpaceX believes it can expedite Starlink’s initial deployment without losing a great deal of performance or interfering with constellations from competitors like OneWeb.
• On 16 November 2018, the US Federal Communications Commission (FCC) announced it had authorized SpaceX to launch 7,518 satellites, adding to 4,425 satellites it has already approved. 26)
- None of the satellites has launched yet. SpaceX has six years to put half in orbit, and nine years to complete the satellite network, according to FCC rules.
• On 1 April 2018, SpaceX received US approval to launch 4,425 LEO (Low Earth Orbit) satellites, a key milestone in its plan to offer broadband with high speeds and low latency around the world. 27) 28)
- The FCC (Federal Communications Commission) issued an order approving SpaceX's application with some conditions. SpaceX intends to start launching operational satellites as early as 2019, with the goal of reaching the full capacity of 4,425 satellites in 2024. The FCC approval just requires SpaceX to launch 50 percent of the satellites by March 2024, and all of them by March 2027.
- "Grant of this application will enable SpaceX to bring high-speed, reliable, and affordable broadband service to consumers in the United States and around the world, including areas underserved or currently unserved by existing networks," the FCC order said.
- SpaceX's network (known as "Starlink") will need separate approval from the ITU (International Telecommunication Union). The FCC said its approval is conditioned on "SpaceX receiving a favorable or 'qualified favorable' rating of its EPFD (Equivalent Power Flux-Density) limits demonstration by the ITU prior to initiation of service." SpaceX will also have to follow other ITU rules.
• February 22, 2018: SpaceX has launched with the debuting of an upgraded payload fairing for the Falcon 9 rocket during Spain’s PAZ satellite lofting from Vandenberg Air Force Base. The launch carried the first two demonstration satellites for SpaceX’s own satellite internet constellation. The launch occurred at an instantaneous launch opportunity at 06:17 Pacific Time (14:17 UTC) on 22 February 2018. 29)
Figure 10: SpaceX’s first two Starlink prototype satellites are pictured here before their inaugural launch, showing off a thoroughly utilitarian bus and several advanced components. They were launched as secondary payloads with the Spanish radar observation satellite (PAZ) on a Falcon 9 rocket from Vandenberg Air Force Base, California. SpaceX called these two prototype Starlink satellites, Tintin-A and Tintin-B (image credit: SpaceX)
The SpaceX launches of the Starlink constellation are presented in reverse order.
- Lighting up the sky over Florida’s Space Coast, a Falcon 9 rocket fired nine Merlin main engines and climbed off pad 39A at Kennedy at 5:42 a.m. EDT (09:42 GMT) Friday. SpaceX returned a Dragon capsule to Earth at 12:43 a.m. EDT (04:43 GMT), bringing home a crew of four from the International Space Station.
- Friday’s launch was the seventh Falcon 9 mission since April 1, a pace near the planned cadence of one launch every five days recently announced by SpaceX founder Elon Musk. SpaceX plans as many as 60 Falcon rocket missions this year from the company’s three operational launch pads.
- Two of the April launches carried crews to the space station.
- “It’s a pretty special time for us,” said Bill Gerstenmaier, SpaceX’s vice president of build and flight reliability, in a press briefing in the wee hours of Friday morning between the crew splashdown and the Starlink launch.
- “I think what’s neat here at SpaceX is we have individual teams that are following all these activities, and they’re focused on their individual piece, and each one of them works on their own area,” Gerstenmaier said. “We still share information across with each other, and that helps us ensure that the spacecraft are safe.
- “So when we fly these extra Starlink launches, we actually learn stuff that we can then take and inform the crew flights, and make sure that the Falcon 9s associated with the crew flights are actually better than they would have been if we would not have flown those Starlink flights,” he said.
- “I think this is a great time to be in spaceflight, to think we’re poised well as a company to support these multiple activities,” said Gerstenmaier, a former NASA engineer and program manager. “Our heads are not swiveling around. We’re really focused on each individual activity, and we can accomplish them one at a time.”
- The launch Friday morning marked SpaceX’s 152nd Falcon 9 rocket flight, and the company’s 18th launch of the year. It was the 44th SpaceX mission primarily dedicated to launching satellites for the company’s privately-funded Starlink broadband network.
- The Falcon 9 aimed to deploy the satellites in a near-circular orbit ranging in altitude between 304 by 317 km, at an orbital inclination of 53.2 degrees to the equator. The satellites will use on-board propulsion to do the rest of the work to reach a circular orbit 540 km above Earth.
- After Friday’s launch, designated Starlink 4-17, SpaceX has deployed 2,494 Starlink satellites in orbit, including spacecraft that were decommissioned or suffered failures. More than 2,100 of those satellites are in orbit and functioning as of this week, according to a list maintained by Jonathan McDowell, an astrophysicist who tracks spaceflight activity.
• Launch 43: A Falcon 9 of SpaceX lifted off from Cape Canaveral’s Space Launch Complex 40 at 5:27 p.m. EDT (21:27 UTC) on 29April 2022 carrying a payload of 53 Starlink satellites. SpaceX confirmed a successful deployment of the satellites an hour after liftoff. 31)
Figure 11: A timelapse of a Falcon 9 launch of a set of 53 Starlink satellites April 29 from Cape Canaveral, Florida, the company's sixth launch that month (image credit: SpaceX)
- The rocket’s first stage landed on a droneship in the Atlantic Ocean, completing its sixth flight. The booster was last used just three weeks earlier on the launch of a Crew Dragon on the Ax-1 private astronaut mission to the International Space Station, a 21-day turnaround that was the shortest between flights to date.
- That launch was the sixth by SpaceX in April, the most by the company in any single calendar month. The company has performed four launches in a month several times and five in December 2021. SpaceX has conducted 17 Falcon 9 launches so far this year, keeping the company on pace to meet a goal of one launch a week this year.
- “Flight rate is really, really important,” Benji Reed, senior director of human spaceflight programs at SpaceX, said during a panel discussion at the AIAA ASCENDx Texas conference April 28. “Flight rate lets you learn, it lets you grow. You have to fly it correctly. You have to fly it safely.”
- A key factor in that high flight rate is the company’s own Starlink constellation. While only two of the six launches in April were of Starlink satellites — the others were the Ax-1 and Crew-4 crewed missions, the Transporter-4 rideshare mission and the NROL-85 classified mission for the National Reconnaissance Office — 10 of the 17 Falcon 9 launches so far this year have been for the deployment of the broadband constellation.
- The Starlink launches, Reed said, are important for such things as pushing the limits of reusability. “It allows us to really learn and expand the envelope of what it takes to fly at a very high flight rate,” he said.
Starship environmental delay
- While SpaceX steps up its launch cadence, its Starship program remains mired in delays. The Federal Aviation Administration announced April 29 it was again pushing back the deadline for the completion of an environmental assessment for orbital launches of that vehicle from SpaceX’s Boca Chica, Texas, test site. The new deadline is now May 31, a one-month delay.
- “SpaceX made multiple changes to its application that require additional FAA analysis,” the FAA said in a statement to reporters. “The agency continues to review around 18,000 general public comments.”
- The FAA didn’t identify what changes SpaceX made and how they might affect the review of what is called a programmatic environmental assessment (PEA). “The FAA is finalizing the review of the Final PEA, including responding to comments and ensuring consistency with SpaceX’s licensing application,” a statement on the FAA website for the effort states. “The FAA is also completing consultation and confirming mitigations for the proposed SpaceX operations. All consultations must be complete before the FAA can issue the Final PEA.”
- According to a “permitting dashboard” operated by the Department of Transportation, the assessment did complete one such consultation, involving an Endangered Species Act consultation with the Fish and Wildlife Service, April 22. Another consultation, called the Section 106 Review after its section of the National Historic Preservation Act, is scheduled to be completed in early May.
- While this is the fourth time that the FAA has pushed back completion of the environmental assessment, originally scheduled for the end of 2021, it is not clear that this alone is delaying the first orbital launch of Starship. While SpaceX showed a fully stacked Starship vehicle in February in Boca Chica, neither the Super Heavy booster nor Starship upper stage displayed then are expected to fly as the company moved to testing other hardware, with no firm timeline of having a vehicle ready to flight.
• Launch 42: SpaceX has launched its 15th Falcon 9 of the year, lofting another batch of 53 Starlink satellites on the Starlink Group 4-14 mission. Liftoff occurred on 21 April 2022 at 1:51 p.m. EDT (17:51 UTC) from Space Launch Complex 40 (SLC-40) at Cape Canaveral Space Force Station (CCSFS) in Florida. 32)
- As is traditional these days, the Falcon 9 for this mission featured a flight-proven booster, B1060. This booster flew for the 12th time, being the second one in the fleet to achieve that – and just one month after B1051 became the first one to reach 12 flights.
- The weather forecast provided by the Space Launch Delta 45’s Weather Squadron predicted a 70% probability of good weather. A worse forecast was predicted for the backup day on the 22nd, with just a 50% probability of good weather.
- For this mission, SpaceX followed from the previous Starlink mission, Starlink Group 4-12, and launched to the northeast with the booster landing on SpaceX’s Autonomous Spaceport Drone Ship (ASDS) Just Read The Instructions. The ship was located approximately 630 km downrange in the north Atlantic Ocean.
- At T+2 minutes and 32 seconds, the nine main engines on the first stage shut down in a sequence of pairs in an event referred to as Main Engine Cut-Off (MECO). Stage separation follows about three seconds later, and the MVac engine on the second stage ignites around five seconds later to push the 53 Starlink satellites into low Earth orbit. Ten seconds after ignition, the fairing halves separate from the rocket and begin preparations for the reentry and recovery sequence.
- The 53 satellites deployed into their parking orbit as planned.
- Orbit: Final altitude of 550 km with an inclination of 53.2º.
• Launch 41: On March 19, 2022 at 12:42 a.m. EDT (04:42 GMT), SpaceX launched a set of 53 Starlink satellites into orbit atop a Falcon 9 rocket after midnight Saturday from Cape Canaveral (SLC-40), Florida. 33)
- The booster flying early Saturday, designated B1051, landed on SpaceX’s drone ship “Just Read the Instructions” parked around 400 miles (640 km) downrange in the Atlantic Ocean, roughly due east of Charleston, South Carolina.
- The mission, numbered Starlink 4-12 in SpaceX’s launch schedule, marked the resumption of Falcon 9 launches toward the northeast from Florida’s Space Coast. Since the start of the year, SpaceX’s launches with Starlink satellites have headed southeast, taking a different route to the same orbit at an inclination of 53.2º to the equator.
- The Starlink 4-12 aimed to deliver another batch of spacecraft into orbit for SpaceX’s privately-funded Starlink broadband network, the company’s sixth straight launch dedicated to lofting satellites for the internet mega-constellation.
- The booster flying on the Starlink 4-12 mission debuted in March 2019 with the unpiloted test flight of SpaceX’s Crew Dragon spacecraft, which paved the way for subsequent SpaceX launches with astronauts. The booster has launched from all three of SpaceX’s active pads in Florida and California, including the Crew Dragon test flight in 2019, a mission with three Canadian Radarsat Earth-imaging satellites, SiriusXM’s SXM 7 radio broadcasting satellite, and eight Starlink flights.
- While the Falcon 9 rocket’s first stage returned to Earth for an offshore landing east of the Carolinas, the second stage fired its single engine to reach a preliminary transfer orbit. Another burn about 45 minutes after liftoff placed the Starlink satellites into the proper orbit for separation.
- The flat-packed spacecraft deployed from the Falcon 9’s upper stage around 59 minutes after liftoff.
- The Starlink satellites will extend solar arrays and use on-board ion thrusters to reach their operational orbit at an altitude of 335 miles (540 km), where they will enter commercial service for SpaceX.
- SpaceX has now launched 2,335 Starlink satellites to date, including spacecraft that were decommissioned or suffered failures. More than 2,000 of those satellites are in orbit and functioning as of Saturday, according to a list maintained by Jonathan McDowell, an astrophysicist who closely tracks spaceflight activity.
• Launch 40: On March 9, 2022 at 8:45 a.m. EST (13:45 UTC) on Wednesday, SpaceX launched 48 Starlink satellites from pad 40 at Cape Canaveral Space Force Station in Florida. 34)
- The mission continued SpaceX’s weekly launch cadence this year. It was SpaceX’s 10th mission of 2022, and came six days after the most recent Starlink mission on March 3.
- Wednesday’s mission, designated Starlink 4-10, mimicked SpaceX’s recent Starlink launches from Florida’s Space Coast. The Falcon 9 rocket, powered by nine Merlin 1D engines, steered southeast from Cape Canaveral Space Force Station.
- Arcing over the Atlantic Ocean, the rocket’s first stage booster turned off its main engines and separated from the Falcon 9’s upper stage at T+plus 2 minutes, 34 seconds. While the second stage powered into orbit with the 48 Starlink satellites, the first stage came back to Earth for a landing on SpaceX’s drone ship “A Shortfall of Gravitas” parked in the Atlantic northeast of the Bahamas.
- The reusable booster flying Tuesday made its fourth launch into space. The rocket, tail number B1052, flew its first two missions as a side booster on SpaceX’s Falcon Heavy rocket. After a conversion effort, SpaceX flew the booster again as the first stage of a Falcon 9 rocket Jan. 31 with an Italian radar remote sensing satellite.
- Now, 37 days later, the booster took off for a fourth time. After a hypersonic descent back into the atmosphere, rocket landed on SpaceX’s drone ship at T+plus 8 minutes, 51 seconds, around 400 miles (650 km) southeast of Cape Canaveral. The vessel will return the booster to Port Canaveral for offloading and refurbishment before another mission.
- The second stage shut down at T+plus 8 minutes, 45 seconds, after reaching a parking orbit. Following a 48-minute coast halfway around the world, the Falcon 9 relit its second stage engine for a one-second burn to place the Starlink satellites into the proper orbit for deployment.
- The Falcon 9 released the flat-packed satellites, each weighing about 250 kg, nearly 66 minutes after launch. The rocket’s guidance computer targeted an orbit ranging between 189 miles and 197 miles (305-by-317 km) in altitude, with an inclination of 53.2º to the equator.
- The Starlink satellites will extend solar arrays and use on-board ion thrusters to reach their operational orbit at an altitude of 335 miles (540 km), where they will enter commercial service for SpaceX.
• Launch 39: On March 3, 2022 at 9:25 a.m. EST (14:25 UTC) Thursday, SpaceX launched 47 Starlink satellites from Launch Complex 39A (LC-39A) at Kennedy Space Center in Florida. This was the 11th flight for the Falcon 9 first stage booster supporting this mission, which previously launched GPS III-3, Turksat-5A, Transporter 2, and now eight Starlink missions. 35) 36)
- A second burn by the upper stage engine delivered the 47 satellites to a near circular orbit at an altitude of almost 200 miles (320 km). The flat-packed, quarter-ton satellites released from the rocket all at once just shy of the 66-minute mark in the mission.
Figure 12: SpaceX’s first stage on the drone ship “Just Read the Instructions.”(image credit: SpaceX)
- Once free of the rocket Thursday, the 47 new Starlink spacecraft — built by SpaceX in Redmond, Washington — were expected to extend their solar panels and turn on ion engines to begin climbing to an operational altitude of 335 miles (540 km). They will also activate their communications payloads, including antennas, transmitters, receivers, and laser cross-links to pass data between the satellites in orbit.
- SpaceX doesn’t release information on the health and status of its Starlink satellites.
• Launch 38: SpaceX launched another set of Starlink satellites Feb. 25 as the company argues its satellite constellation is consistent with the safe and sustainable use of low Earth orbit. 37)
- A Falcon 9 lifted off at 12:12 p.m. EST (17:12 UTC)) from Space Launch Complex 4E at Vandenberg Space Force Base in California. The rocket deployed its payload of 50 Starlink satellites into an orbit at an altitude of about 315 kilometers a little more than an hour later.
- The Falcon 9 first stage landed on a droneship in the Pacific Ocean downrange of Vandenberg nearly nine minutes after liftoff. The booster previously launched the Sentinel-6A Michael Freilich and Double Asteroid Redirection Test (DART) spacecraft for NASA as well as one Starlink mission.
- SpaceX noted in its webcast of the launch that it is now offering services in 29 countries, most recently Brazil and Bulgaria. The company also worked with the government of Tonga to provide connectivity after a volcanic eruption in January broke submarine cables providing internet connectivity for the Pacific island nation. While the main international cable serving Tonga has been repaired, the government is using Starlink antennas to provide connectivity to outlying islands where cables may not be repaired for months.
Starlink’s sustainability case
- This launch came four days after another Falcon 9 launched 46 Starlink satellites from Cape Canaveral, Florida. The company now has 1,970 Starlink satellites in orbit, a constellation far larger than any other satellite system today.
- SpaceX is seeking permission from the Federal Communications Commission to place as many as 30,000 next-generation Starlink satellites into orbit, prompting objections and other criticism. One example was a Feb. 8 letter from NASA outlining its concerns about SpaceX’s proposal, such as increased conjunctions between Starlink satellites and other space objects as well as interference with satellite and ground-based science.
- In an apparent response to that criticism, SpaceX published Feb. 22 a lengthy statement arguing that it is committed to space sustainability. “SpaceX has demonstrated this commitment to space safety through action, investing significant resources to ensure that all our launch vehicles, spacecraft, and satellites meet or exceed space safety regulations and best practices,” the company wrote.
- It cited as proof of that commitment designing “highly reliable, maneuverable” satellites designed to break up completely upon reentry; placing satellites initially in very low orbits after launch for initial checkouts; operating the entire constellation at altitudes below 600 kilometers, so that satellites will naturally reenter within 25 years of the end of their life if they are not deliberately deorbited; and the use of an autonomous collision avoidance system.
- While the statement largely reiterated past arguments by the company about the overall safety of the Starlink system, it did offer some new data points. SpaceX said that Starlink satellites performed 3,300 collision avoidance maneuvers in the second half of 2021, with more than 1,600 involving close approaches to debris and 1,400 with other satellites. Each Starlink satellite is designed to “duck” to avoid potential collisions by moving its large solar array to create the smallest possible cross-section to an approaching object. Doing so can further reduce the odds of a collision by a factor of 4 to 10.
- SpaceX said it has the ability to build 45 satellites, the approximate payload of a single launch, per week. Of the more than 2,000 satellites launched to date, SpaceX claimed only 1% have failed after going into their operational orbits. The company said it can deorbit a satellite within four weeks by first using onboard propellant to lower its orbit then initiating a “high drag mode” to maximize atmospheric drag for reentry.
- “SpaceX has safely deorbited over 200 satellites utilizing this approach,” the company said. “By building reliable, debris minimizing satellites, planning for active deorbit and designing for full demisability, we ensure we’re keeping space sustainable and safe.”
• Launch 37: SpaceX launched a set of Starlink satellites Feb. 21 after more than three-fourths of the satellites from the previous launch were lost because of a solar storm. 38)
Figure 13: A SpaceX Falcon 9 lifts off Feb. 21 carrying 46 Starlink satellites (image credit: Space Launch Delta 45)
- A Falcon 9 lifted off from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida at 9:44 a.m. EST (14:44 UTC) after a one-day delay because of recovery weather. The Falcon 9 upper stage deployed its payload of 46 Starlink satellites 62 minutes after liftoff, although confirmation of a successful deployment didn’t come until about 20 minutes later because of a lack of ground station coverage.
- The rocket’s first stage completed it eleventh flight with a landing on a droneship near the Bahamas. The stage had previously launched the Demo-2 commercial crew mission, CRS-21 cargo mission, the Anasis-2 satellite, two Transporter rideshare missions and five Starlink missions. The booster is the second in SpaceX’s fleet to have performed 11 launches.
- The launch was the seventh Falcon 9 mission this year, keeping the company on a pace for approximately 50 launches this year. This was the fourth Starlink launch this year, with the other launches carrying the CSG-2 radar imaging satellite for Italy, the Transporter-3 rideshare mission and a classified payload for the National Reconnaissance Office.
- This was the first launch since a Feb. 3 mission that placed 49 Starlink satellites into orbit. However, the company announced five days later that up to 40 of them would reenter because of a solar storm that increased atmospheric drag at the low altitudes the satellites were placed into, keeping their electric propulsion systems from raising their orbits. Ultimately 38 of the 49 satellites reentered.
- SpaceX took a different approach with this mission. The previous launch deployed the satellites after a single burn of the upper stage, placing the satellites into orbit with a perigee of 210 kilometers. This flight conducted a second burn to place the satellites into a near circular orbit at an altitude of about 330 kilometers. The higher altitude reduces the atmospheric drag, but may also explain why this launch carried three fewer satellites than previous recent missions.
- Another set of Starlink satellites is scheduled to launch as soon as Feb. 25 on a Falcon 9 from Vandenberg Space Force Base in California.
• Launch 36: SpaceX launched another set of Starlink satellites Feb. 3 as it prepares to offer a faster, more expensive premium service for the broadband network. 39)
- A Falcon 9 carrying 49 Starlink satellites launched from Launch Complex 39A at Florida’s Kennedy Space Center at 1:13 p.m. EST (18:13 UTC).
- About 90 minutes later, SpaceX confirmed the satellites had been deployed from the upper stage to low Earth orbit through a social media post.
- Shortly after launch, the rocket’s first stage landed on SpaceX’s drone ship in the Atlantic Ocean. The booster has previously supported five earlier SpaceX launches, including satellites and missions to the International Space Station.
- The payload’s fairing, which parachutes to the ocean to be recovered by boat after separating from the upper stage, has also been used multiple times.
- According to SpaceX, one half was used for five previous Starlink missions. The other half supported two earlier Starlink launches in addition to Transporter-1, SpaceX’s first dedicated rideshare program mission in January 2021.
- SpaceX has launched 2,091 satellites for its LEO constellation, according to statistics kept by astrophysicist and spaceflight analyst Jonathan McDowell, including two prototype spacecraft.
- Extrapolating McDowell’s figures following SpaceX’s latest launch, around 1,920 of those Starlink satellites are currently in orbit.
- SpaceX is currently authorized to deploy 4,408 satellites in LEO to build out the network’s global coverage.
- The company also seeks regulatory permission for a second-generation constellation of nearly 30,000 satellites to improve performance.
- For the areas it is available, Starlink’s website says users “can expect to see download speeds” of 100-200 Mbit/s and “latency as low as” 20 milliseconds “in most locations.”
- Users are charged $499 for hardware that includes an antenna and $99 per month for the service.
- However, SpaceX CEO Elon Musk announced a more expensive service tier via Twitter Feb. 2 called Starlink Premium, which he said will include an antenna with “twice the area of our standard phased array with broader scan angle.”
- According to Starlink Premium’s website, the new service is specifically designed for small offices, storefronts, and high-demand users who can expect download speeds of 150-500 Mbit/s.
- “Designed specifically for high demand users, Starlink Premium helps ensure bandwidth for critical operations even during times of peak network usage,” the website says.
- Starlink Premium users will be charged $2,500 for hardware and a $500 monthly fee for the service.
- The company expects to start making deliveries for Starlink Premium in the second quarter of 2022.
• Launch 35: SpaceX passed the threshold of more than 2,000 Starlink satellites launched after a Falcon 9 placed another set of broadband internet spacecraft into orbit Jan. 18. 2022. 40)
- The Falcon 9 lifted off from Launch Complex 39A the Kennedy Space Center at 9:02 p.m. EST (02:02 UTC on 19 January 2022). The launch was originally scheduled for 7:04 p.m. EST , but SpaceX postponed the launch to the second of two opportunities that evening. The company did not disclose the reason for the delay.
Figure 14: An ascending Falcon 9 rocket illuminates Kennedy Space Center’s Launch Complex 39A during an evening launch Jan. 18 (image credit: SpaceX webcast)
- The Falcon 9 second stage released its payload of 49 Starlink satellites into low Earth orbit 15 and a half minutes after liftoff. However, the deployment took place in a part of the orbit without ground station coverage, so confirmation did not come until the stage passed over a ground station in Alaska about an hour later.
- The rocket’s first stage landed on a droneship in the Atlantic eight and a half minutes after liftoff. The stage made its 10th flight, after previously launching a GPS 3 satellite, the Turksat 5A communications satellite, the Transporter-2 rideshare mission, and six other Starlink missions. This is the fourth Falcon 9 booster to have completed at least 10 missions, including one that has launched and landed 11 times.
- The 49 satellites on this mission, called Starlink 4-6 by SpaceX, bring the total number of Starlink satellites launched by the company to 2,042, according to statistics kept by astrophysicist and spaceflight analyst Jonathan McDowell. That figure includes two prototype “Tintin” satellites launched in February 2018 and the series of Starlink launches, carrying up to 60 satellites at a time, that started in May 2019.
- Not all those 2,042 satellites are operational or even still in orbit. McDowell counts 1,879 satellites in orbit, counting this latest set of satellites, with 1,495 satellites in operational orbits. SpaceX Chief Executive Elon Musk, in a Jan. 15 tweet, said there were 1,469 satellites active, with 272 moving to operational orbits.
- SpaceX’s current Starlink constellation is authorized for 4,408 satellites, all in orbits at around 550 kilometers. The company is seeking a Federal Communications Commission license for a second-generation system of approximately 30,000 satellites that it says would launch using its Starship vehicle under development.
- In a paper published Jan. 17 in The Astrophysical Journal Letters, astronomers assess the effect that Starlink had on one observatory, the Zwicky Transient Facility (ZTF) at Palomar Observatory in California. The research found a sharp increase in the number of images taken near dawn and dusk that had streaks from satellites (see ”Mission status” in this file below).
• Launch 34: After setting a record for launch activity in 2021, SpaceX started 2022 with the Falcon 9 launch of a set of Starlink satellites January 6. 41)
- The Falcon 9 lifted off from Launch Complex 39A at the Kennedy Space Center in Florida at 4:49 p.m. EST (21:49 UTC) on a mission designated Starlink 4-5 by SpaceX. Its payload of 49 Starlink satellites separated from the upper stage 15 and a half minutes after liftoff, but because of a lack of ground station coverage, confirmation of the separation did not take place until about an hour later.
- The rocket’s first stage landed on a droneship in the Atlantic Ocean near The Bahamas nearly nine minutes after liftoff. The booster completed its fourth flight, having previously been used for two GPS 3 satellite launches and the Inspiration4 commercial Crew Dragon mission.
- The launch took an unusual southeastern trajectory, rather than the northeastern trajectory used for previous Starlink launches from Florida. A Space Force official said it was the first of several projected for January that would go on southern, or polar, trajectories.
- “The 2022 launch pace is going to be exceptionally busy with up to five polar, and seven total launches, projected for the month of January alone,” Maj. Jonathan Szul, director of operations for the First Range Operations Squadron at Cape Canaveral Space Force Station, said in a Jan. 4 statement. “While three polar missions successfully launched in the past year and a half, Cape Canaveral has never had five southern trajectory launches in a single month.”
- He did not list the polar launches expected in January beyond Starlink 4-5. One of them is Transporter-3, the dedicated rideshare Falcon 9 launch currently scheduled for Jan. 13. Another is likely the Falcon 9 launch of a Cosmo-SkyMed Second Generation radar imaging satellite for the Italian space agency ASI, expected in late January. The other polar launches may be Starlink missions.
- The greater use of launches on southern trajectories was a concern for Space Launch Delta 45, the Space Force unit that operates the Eastern Range, because of different airspace and maritime restrictions that pilots and boaters may not be used to. “Due to the unique southerly trajectories, there will be a larger potential impact to air and sea traffic along the southeast coast of Florida,” Szul said.
- This first SpaceX launch of 2022 — also the first orbital launch worldwide of the new year — comes after SpaceX set a company record in 2021 with 31 orbital launches, all on Falcon 9 rockets.
- SpaceX has not announced a goal for 2022, but in a panel discussion at Euroconsult’s World Satellite Business Week Dec. 13, Tom Ochinero, vice president of commercial sales at SpaceX, said the company’s plans for 2022 included at least three crewed missions and five launches of the Falcon Heavy, which last launched in 2019. “Next year will be more exciting,” he said of 2022.
• Launch 33: A SpaceX Falcon 9 launched a new set of Starlink satellites Dec. 18, setting a new reusability mark for the vehicle in the process. 42)
- The Falcon 9 lifted off from Space Launch Complex 4E at Vandenberg Space Force Base in California at 12:41 UTC (7:41 a.m. EST). The rocket’s upper stage deployed a payload of 52 satellites into a mid-inclination orbit (53.2º) nearly 16 minutes later.
- The rocket’s first stage landed on the droneship “Of Course I Still Love You” about eight and a half minutes after liftoff. The booster completed its eleventh flight, a record for SpaceX. The stage was first used for the Demo-1 commercial crew test flight in March 2019 and subsequently launched the Radarsat Constellation Mission, SMX-7 radio satellite and seven sets of Starlink satellites.
- With this mission, SpaceX has launched nearly 1,950 Starlink satellites, of which about 1,800 are in orbit. Of SpaceX’s 29 Falcon 9 launches this year — another record for the company — 17 had Starlink satellites as the primary payload.
- SpaceX continues to both expand the Starlink constellation and its customer base. Speaking at Euroconsult’s World Satellite Business Week, Jonathan Hofeller, vice president of Starlink and commercial sales at SpaceX, said the company had more than 100,000 consumer and enterprise customers so far. “We’re just getting warmed up,” he said.
- Starlink is currently operating in 20 countries. “There’s probably several dozen more that are in work,” he said, citing efforts by a dedicated market access team at SpaceX.
- A major theme at the conference (in Reykjavík, Iceland) was the ability to provide “multi-orbit” solutions, combining geostationary orbit communications satellites with low or medium Earth orbit constellations. Advocates of such approaches, primarily GEO satellite operators, argue that multi-orbit systems combine the best of both geostationary and non-geostationary systems, with GEO systems providing more capacity in targeted areas, like cities, while NGSO systems provide low-latency services where needed.
- Hofeller said SpaceX was not seeking to offer Starlink as part of a multi-orbit solution in partnership with a GEO operator. “We’re open to exploring where LEO plus GEO makes sense, and we continue to be open,” he said. “We have yet to find that exact solution that works best.”
- “I challenge the convention that the benefit of GEO is that it’s high density in certain areas,” he continued. “There’s no reason why LEO can’t be high density, hand bandwidth in high-density areas.”
- “If given the choice between a more complex hybrid solution, or one that can provide low latency and high speed all the time and meet their speed and bandwidth demands, they’ll choose the simpler solution with the simpler architecture that LEO provides,” he said.
• Launch 32: On 02 December 2021 at 23:12 UTC (6:12 p.m. EST), SpaceX deployed 48 more satellites for its Starlink broadband constellation, along with two remote sensing spacecraft for BlackSky (BlackSky-12 & -13) in a mission that breaks the record for Falcon 9 launches in a calendar year. 43)
- All satellites successfully separated from the Falcon 9 in low Earth orbit, according to SpaceX, after lifting off from the Space Launch Complex 40 in Cape Canaveral, Florida. The spacecraft were deployed into an orbit of 430 km altitude with an inclination of 53.2º.
- After completing its mission, the Falcon 9’s reusable first stage successfully performed its ninth landing as it touched down on a drone ship in the Atlantic Ocean.
- This marks SpaceX’s 27th Falcon 9 mission so far this year, beating the previous record of 26 that the company set in 2020.
- Many of the Falcon 9 missions in 2021 have carried payloads for Starlink, and SpaceX has now launched more than 1,890 satellites for the broadband network as it builds out global coverage.
Figure 16: On Thursday, December 2 at 6:12 p.m. EST, Falcon 9 launched 48 Starlink satellites and two BlackSky spacecraft to orbit from Space Launch Complex 40 (SLC-40) at Cape Canaveral Space Force Station in Florida. This was the ninth launch and landing of this Falcon 9 first stage booster, which previously launched GPS III-3, Turksat 5A, Transporter-2, and now six Starlink missions (image credit: SpaceX)
• Launch 31: SpaceX launched 53 Starlink internet satellites into orbit on top of a Falcon 9 rocket Saturday from foggy Cape Canaveral, commencing a new phase of deploying the global broadband network with the first launch into a new “shell” some 335 miles (550 km) above Earth. 44)
Figure 17: A Falcon 9 rocket climbs above a fog layer at Cape Canaveral Space Force Station with 53 Starlink internet satellites (image credit: SpaceX)
- The mission was the 31st Falcon 9 launch in two-and-a-half years dedicated to carrying satellites for the Starlink internet network, bringing the total number of Starlink spacecraft launched to 1,844.
- Veiled in fog, the Falcon 9 lifted off from pad 40 at Cape Canaveral at 7:19:30 a.m. EST (12:19:30 GMT) on 13 November 2021. Nine Merlin main engines throttled up to produce 1.7 million pounds of thrust, powering the launcher off the pad and quickly through the ground-hugging fog layer.
- SpaceX showed views of the booster — designated B1058 in SpaceX’s fleet — falling back through the atmosphere. A landing burn using the rocket’s center engine slowed the vehicle down for an on-target touchdown on SpaceX’s drone ship “Just Read the Instructions” positioned east of Charleston, South Carolina.
- The landing concluded the ninth trip to space and back for the booster, which debuted in May 2020 with the launch of astronauts Doug Hurley and Bob Behnken on SpaceX’s first crew mission. The historic launch ended a nine-year drought of orbital crew launches from U.S. soil.
- Most of the Starlink satellites launched so far have deployed into a 341-mile-high (550 km), 53º inclination orbit, the first of five orbital shells SpaceX plans to complete full deployment of the Starlink network. SpaceX finished launching satellites in that shell with a series of Starlink flights from Cape Canaveral from May 2019 through May of this year.
- Since May, SpaceX has rushed to complete development of new inter-satellite laser terminals to put on all future Starlink satellites. The laser crosslinks, which have been tested on a handful of Starlink satellites on prior launches, will reduce the reliance of SpaceX’s internet network on ground stations.
- The ground stations are expensive to deploy, and come with geographical — and sometimes political — constraints on where they can be positioned. Laser links will allow the Starlink satellites to pass internet traffic from spacecraft to spacecraft around the world, without needing to relay the signals to a ground station connected to a terrestrial network.
- “Inter-satellite laser communications means Starlink can carry data at speed of light in vacuum all around Earth before touching ground,” tweeted Elon Musk, SpaceX’s founder and CEO. “Over time, some amount of communication can simply be from one user terminal to another without touching the internet.”
- The completion of the first Starlink shell enables the network to provide high-speed, low-latency internet services to lower latitudes, such as the southern United States. The partial deployment of satellites into the first orbital shell initially provided service over northern regions of the United States, Canada, and Europe, as well as higher-latitude regions in the southern hemisphere.
- SpaceX is currently providing interim internet services through the Starlink satellites to consumers who have signed up for a beta testing program.
- Musk tweeted Saturday that the Starlink network should work for maritime customers by mid-2022, once SpaceX has launched enough laser-equipped satellites. “Until then, it will be patchy when far from land,” he tweeted.
- A Falcon 9 lifted off from Space Launch Complex 4E at Vandenberg Space Force Base in California at 11:55 p.m. EDT on 13 Sept. (03:55 UTC on 14 September). The rocket’s payload of 51 Starlink satellites deployed 15 and a half minutes after launch, although it took an additional 11 minutes to confirm the satellites separated as expected.
Figure 18: A SpaceX Falcon 9 ascends after liftoff from Vandenberg SFB, California, carrying a payload of Starlink satellites (image credit: SpaceX webcast)
- The rocket’s first stage, making its tenth flight, landed on a droneship in the Pacific Ocean nearly nine minutes after liftoff. The booster, the second to have reached the ten-flight milestone, had previously launched seven other Starlink missions as well as the Telstar 18 Vantage and Iridium-8 missions.
- The launch was the first dedicated Starlink launch since May 26, although three Starlink satellites were included on the Transporter-2 rideshare mission that launched June 30. The launch was also the first dedicated launch of Starlink satellites to polar orbit (70º inclination).
- SpaceX blamed the long gap in Starlink launches on delays in completing a new series of satellites that include laser intersatellite links. Those links will minimize the number of ground stations the network needs to provide service in the polar regions and over the oceans.
- At a panel session during the 36th Space Symposium Aug. 24, Gwynne Shotwell, president and chief operating officer of SpaceX, said delays in equipping those satellites with crosslinks was “why we have been struggling” to perform a Starlink launch. She estimated then that the next launch would be “roughly three weeks,” which proved accurate.
- Shotwell said that all future Starlink satellites with have laser intersatellite links, a point the company confirmed on the launch webcast. SpaceX also confirmed it’s working on a new version of the Starlink user terminal that will be cheaper and faster for the company to produce.
- Previous Starlink missions to mid-inclination orbits carried 60 satellites, while this mission carried 51. SpaceX didn’t explain if the reduced number of satellites was because of the higher inclination of the mission, increased size or mass of the satellites because of their new crosslinks, or some combination of those factors.
• Launch 29: A SpaceX Falcon 9 launched another set of 60 Starlink satellites on 26 May 2021 at 18:59 UTC (2:59 p.m. EDT) from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida. The rocket’s upper stage released its payload of 60 Starlink satellites into orbit 64 minutes later. 47)
- The rocket’s first stage landed on a droneship in the Atlantic eight and a half minutes after liftoff. In contrast to some recent Starlink launches, where the Falcon 9 boosters had launched as many as 10 times, this Falcon 9 first stage was on only its second launch, having previously been used to launch the Sentinel-6 Michael Freilich ocean science satellite in November 2020.
- SpaceX did set a different kind of reuse milestone on this launch. One of two halves of the payload fairing was on its fifth flight, the first time a payload fairing section had flown five times. The fairing half flew on four previous Starlink launches dating back to 2019. The second fairing half was on its third launch, having been used previously on a Starlink launch and the Transporter-1 rideshare mission in January.
- The launch was also the 40th Falcon 9 mission to fly at least one reused payload fairing half. The company had quietly made regular use of previously flown payload fairings, which deploy parachutes after separation from the rocket’s upper stage and are recovered in the ocean by boats.
- SpaceX Chief Executive Elon Musk said several years ago that the company would attempt to recover and reuse payload fairings because of their expense: about $6 million each. “Imagine if you had $6 million in cash in a pallet flying through the air, and it was going to smash into the ocean. Would you try to recover that? Yes, yes you would,” Musk said in 2017, after the company launched its first reused Falcon 9.
- Unlike the booster landings, which the company broadcasts on its launch webcasts, the fairing recoveries take place out of view. SpaceX would occasionally provide video of attempts to catch the descending fairings in large nets strung above ships, but more recently has moved to simply recovering fairings from the water after splashdown.
- This launch also marked the 100th consecutive successful Falcon 9 launch, a streak that started after a June 2015 launch failure on a NASA commercial cargo mission. That streak does not include the loss of the Amos-6 satellite when a Falcon 9 exploded during preparations for a static-fire test days before its scheduled launch in September 2016.
- The launch brings the total number of Starlink satellites in orbit to 1,664. Viasat filed a motion with the Federal Communications Committee May 21 to stay its approval of a modification of SpaceX’s license that allows the company to increase the number of Starlink satellites it can operate in orbits about 550 kilometers high from 1,584 to 4,408. That would effectively block SpaceX from launching additional satellites until the FCC completed an environmental review of the constellation demanded by Viasat.
- The FCC has not yet acted on the motion, and SpaceX did not mention the dispute in its launch webcast, which instead noted that the company has expanded the beta test of the Starlink service to residents of Belgium and the Netherlands.
• Launch 28: On Saturday, May 15 at 22:56 UTC (6:56 p.m. EDT) a SpaceX Falcon 9 vehicle launched a set of 52 Starlink satellites, the Capella-6 SAR microsatellite, and a Tyvak-0310 nanosatellite (6U CubeSat) from Launch Complex 39A (LC-39A) at Kennedy Space Center in Florida. 48)
- The rocket’s first stage, making its eighth launch dating back to the Demo-2 commercial mission nearly a year ago, landed on a droneship in the Atlantic. 49)
Figure 19: A Falcon 9 lifts off from the Kennedy Space Center May 15 carrying 52 Starlink satellites and two rideshare payloads (image credit: SpaceX webcast)
- The rocket’s primary payload, 52 Starlink satellites, separated from the rocket’s upper stage 1 hour and 38 minutes after liftoff. The launch brings the total number of Starlink satellites in orbit to more than 1,600. This was the fourth Falcon 9 launch of Starlink satellites in 17 days, and the ninth Falcon 9 launch of Starlink satellites since the beginning of March.
- This launch did not carry the usual complement of 60 Starlink satellites as SpaceX included two rideshare payloads on the rocket that were released from the upper stage about an hour after liftoff. One was the latest in a series of synthetic aperture radar (SAR) imaging satellites for Capella Space. The company launched two other SAR satellites on Transporter-1, a SpaceX Falcon 9 dedicated rideshare mission in January.
- The other was Tyvak-0130, a 6U CubeSat built by Tyvak Nano-Satellite Systems. Neither Tyvak nor SpaceX disclosed details about the satellite, including basic information such as its size and mission. A September 2019 document by NOAA’s Commercial Remote Sensing Regulatory Affairs office described Tyvak-0130 as “an optical spectrum astronomy observation satellite” but did not disclose technical details or if the satellite was built for another customer.
- A February 2020 application for a ground station filed with the Federal Communications Commission said that the antenna would be used to communicate with both Tyvak-0130 and Tyvak-0129. The latter is a 6U CubeSat launched in December 2019 designed to test what Tyvak called “next-generation spacecraft systems” it planned to use on future spacecraft.
- Kate Tice, the host of the SpaceX webcast, said that the company “offers multiple launch opportunities each month for small satellites to ride to space on existing low Earth orbit missions.” However, this is only the second mission of the year to carry rideshare payloads, after Transporter-1 launch in January. Several Falcon 9 launches of Starlink satellites last year carried rideshare payloads for BlackSky and Planet.
- SpaceX also announced it had started beta testing Starlink in parts of the Netherlands. The company has been gradually expanding the beta test program, recently adding Austria and France.
• Launch 27: On Sunday, May 9 at 6:42 UTC 2021 (2:42 a.m. EDT), Falcon 9 launched 60 Starlink satellites (Starlink V1.0-L27 ) from Space Launch Complex 40 (SLC-40) at Cape Canaveral Space Force Station in Florida. After stage separation, Falcon 9’s first stage returned to Earth and landed on the “Just Read the Instructions” droneship. -The rocket’s upper stage deployed its payload of 60 Starlink satellites into low Earth orbit nearly 65 minutes later. 50)
- This was the first Falcon 9 first-stage booster to complete a tenth launch and landing. The first-stage booster previously supported Crew Dragon’s first demonstration mission to the International Space Station, the RADARSAT Constellation Mission, SXM-7 satellite for SiriusXM, and now seven Starlink missions.
Figure 20: Schematic view of the Launch, first-stage Landing, and Deployment of the SpaceX mission phases (image credit: SpaceX)
- SpaceX had long identified 10 flights as a goal for Falcon 9 reuse in order to justify the significant investment the company made into reusability. In recent months, though, company executives have suggested that the booster can fly more than 10 times.
- “There doesn’t seem to be any obvious limit to the reusability of the vehicle,” Elon Musk, chief executive of SpaceX, said at an April 23 NASA press conference after the Crew-2 launch.
- The company has been using its own Starlink missions to push the boundaries of booster reuse. That has uncovered issues, such as a February launch where the Starlink payload reached orbit but the booster failed to land. That booster was making its sixth flight, but some engine components, such as “boots” or covers around the engines, were life leaders. One of those covers had a hole that allowed hot gas from the engine exhaust get into other parts of the engine, triggering a shutdown that prevented the stage from landing.
- “We do intend to fly the Falcon 9 booster until we see some kind of a failure with the Starlink missions, have that be a life-leader,” Musk said at the briefing, noting at the time that a tenth flight of a booster was upcoming. “We’re learning a lot of about reusability. It’s a hard problem for rockets.”
- SpaceX has not disclosed whether it will attempt to use this booster for an eleventh launch, but the successful landing at least preserves that possibility. “This booster gets to live again,” Michael Andrews, the host of the SpaceX launch webcast, said shortly after the landing.
• Launch 26: SpaceX continued the deployment of its Starlink broadband megaconstellation May 4 with the second launch of 60 satellites in less than a week. A Falcon 9 lifted off from Kennedy Space Center’s Launch Complex 39A at 19:01 UTC (3:01 p.m. EDT). The rocket’s second stage released its payload of 60 Starlink satellites 64 minutes later. 52)
- The rocket’s first stage landed on the center of a droneship in the Atlantic Ocean, completing its ninth flight. The booster previously launched the Telstar 18 Vantage communications satellite, a set of Iridium satellites, and six other Starlink missions. This is the second booster SpaceX has flown nine times.
- SpaceX had previously suggested Falcon 9 boosters could fly up to 10 times, but more recently indicated those stages could have longer lifetimes. “I don’t think the number 10 is a magic number,” Hans Koenigsmann, senior adviser for build and flight reliability at SpaceX, said in February. Once a booster reaches the 10-flight milestone, “we will continue to look at that booster and make an assessment whether we can move forward with it.”
- That milestone could come soon. The next Falcon 9 Starlink launch, scheduled for no earlier than May 9, is expected to use the other Falcon 9 booster that has flown nine times, most recently in March. The company is using its internal Starlink missions to test the limits of booster reusability.
- “There doesn’t seem to be any obvious limit to the reusability of the vehicle,” Elon Musk, chief executive of SpaceX, said at an April 23 NASA press conference after the Crew-2 launch. “We do intend to fly the Falcon 9 booster until we some kind of a failure with the Starlink missions, have that be a life-leader.”
- This launch comes less than a week after the previous Falcon 9 Starlink launch April 28. Of the 13 Falcon 9 launches so far this year, 10 have been dedicated to Starlink satellites while the eleventh, the Transporter-1 rideshare mission, carried 10 Starlink satellites, bringing the total number of Starlink satellites launched so far in 2021 to 610. Nearly 1,500 Starlink satellites are currently in orbit.
- SpaceX is continuing to build out its Starlink constellation, buoyed by a Federal Communications Commission decision April 27 to approve a license modification sought by SpaceX. That modification will allow SpaceX to operate 2,814 satellites originally planned for orbits between 1,100 and 1,300 kilometers to orbits of 540 to 570 kilometers.
- The Starlink service remains in a beta test phase in the United States and several other countries, although Musk suggested last month that the beta test could end as soon as this summer as the constellation is built out.
- Siva Bharadvaj, the SpaceX engineer who hosted the webcast of this latest launch, said that “over half a million people have placed an order or put down a deposit for Starlink.” He did not disclose how many people are actively using the service, though.
Figure 21: A set of Starlink satellites separates from the Falcon 9’s upper stage after its April 28 launch (image credit: SpaceX webcast)
- The Falcon 9 rocket lifted off from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida at 11:44 p.m. Eastern. The rocket’s upper stage deployed its payload of 60 Starlink satellites into low Earth orbit nearly 65 minutes later.
- The launch took place a day after the Federal Communications Commission approved SpaceX’s request to modify its Starlink constellation. The modification will move 2,814 satellites originally approved for launch in orbits of 1,100 to 1,300 km to orbits of 540 to 570 km, similar to the 550-km orbits used by existing Starlink satellites.
- SpaceX did not mention the FCC’s decision in its webcast. However, it did discuss how it chose lower orbits for spaceflight safety, ensuring that satellites will deorbit within several years of the end of their lives. It also mentioned its work with the 18th Space Control Squadron, sharing data on the orbits of Starlink satellites for collision avoidance activities, as well as a recent agreement with NASA to coordinate maneuvers between Starlink and NASA spacecraft in low Earth orbit.
- “We are extremely proud of our efforts to not only provide internet access to the disconnected, but also ensure space remains a place where human spaceflight continues to grow,” Jessie Anderson, host of the webcast, said.
- With this launch, SpaceX has now placed 1,505 Starlink satellites into orbit, of which 1,434 remain in orbit. The company was approaching its previous authorization of 1,584 satellites in 550-km orbits when the FCC approved its license modification to allow more satellites in those lower orbits.
- SpaceX has been using the Starlink launches to push the limits of reusability of the Falcon 9 first stage. “There doesn’t seem to be any obvious limit to the reusability of the vehicle,” Elon Musk, chief executive of SpaceX, said at an April 23 NASA press conference after the Crew-2 launch. “We do intend to fly the Falcon 9 booster until we some kind of a failure with the Starlink missions, have that be a life-leader.”
- Musk’s comments came after the first launch of a reused Falcon 9 first stage on a crewed mission. The Crew-2 launch used the same first stage that flew the Crew-1 mission the previous November.
- Musk said he and NASA have discussed what the optimal number of launches of a booster might be. “Do you want to be on a brand-new booster?” he asked. “You probably don’t want to be on the life leader for a crewed mission, but it’s probably good to have a flight or two under its belt.” He suggested a “couple of flights” might be best for a booster launching a crewed mission.
- “It’s a hard problem for a rocket,” he said of reusability.
- SpaceX also used the launch to honor Michael Collins, the Apollo 11 astronaut who died earlier that day at the age of 90. “Godspeed Apollo 11’s Michael Collins,” the SpaceX launch director said as the rocket lifted off. “May the pursuit of exploration live on.”
• Launch 24: SpaceX continued the rollout of its Starlink broadband constellation with another launch of 60 satellites April 7, edging closer to providing continuous global service. 54)
- A Falcon 9 lifted off from Space Launch Complex 40 at Cape Canaveral Space Force Station at 12:34 p.m. EDT (16:34 UTC) on 7 April 2021. The rocket’s upper stage deployed its payload of 60 Starlink satellites into orbit a little more than an hour later.
- The rocket’s first stage landed on a droneship in the Atlantic eight and a half minutes after liftoff. This was the seventh flight for this booster, which first launched the Demo-2 commercial crew mission last May and most recently launched another set of Starlink satellites March 11.
- This was the 10th Falcon 9 launch of the year for SpaceX, eight of which have been dedicated to Starlink satellites. The company now has 1,378 satellites in orbit when accounting for those launched and subsequently deorbited, according to statistics maintained by Jonathan McDowell.
- That constellation is now nearing the size needed to provide at least basic service globally. “We do have global reach, but we don’t have yet have full connectivity globally,” Gwynne Shotwell, president and chief operating officer of SpaceX, said during an April 6 panel discussion at the Satellite 2021 LEO Digital Forum.
- “We hope after about 28 launches we’ll have continuous coverage throughout the globe,” she added. This launch is the 23rd of v1.0 satellites, although a few v0.9 satellites launched nearly two years ago remain in orbit, along with 10 v1.0 satellites launched into polar orbit on a rideshare mission in January. That suggests the company will reach the continuous coverage milestone after four to five more launches.
- Those launches would push SpaceX against its current FCC authorization, which allows the company to operate up to 1,584 satellites in orbits at approximately 550 km. The company’s current license from the Federal Communications Commission allows it to operate 2,825 additional satellites at altitudes of 1,100 to 1,300 km. SpaceX had filed a request with the FCC to modify that license, moving those additional satellites to 550 km.
- The FCC has yet to rule on that modification, but SpaceX’s current launch rate means the company will hit its current limit of satellites at 550 km within a couple months. Shotwell mentioned during the panel that the company is “bringing our satellites down from our original altitude” to address space sustainability concerns. She did not, though, address the FCC license modification issue beyond saying that the company would continue launching satellites “as we’re allowed.”
- Shotwell said the company would press ahead with Starlink launches even after hitting the threshold of continuous global coverage. “The plan after that is to continue to add satellites to provide additional capacity,” she said. That includes launching additional satellites to polar orbit beginning this summer from Vandenberg Air Force Base in California. Those polar satellites, she said, will likely include laser intersatellite links that the company has experimented with on a few Starlink satellites.
- The element of the overall Starlink effort that has attracted the most attention is the series of launches that has created the world’s largest satellite constellation in less than two years. That has not necessarily been the biggest challenge for SpaceX, though.
- “The satellites and launch have been pretty straightforward for us. We thought we’d struggle a little bit more on the satellites, but it turns out our Dragon, which is a very sophisticated satellite, helped us tremendously in figuring out the satellite architecture for Starlink,” she said.
- Starlink remains in a beta test in the United States and several other countries. Shotwell said there are no plans to end the beta test and move into full commercial service in the near future. “We still have a lot of work to do to make the network reliable,” she said. “We’ll move out of beta when we have a really great product that we are very proud of.”
- Another area of effort has been on the ground equipment used by Starlink subscribers, notably the electronically steerable antenna. Shotwell said the company has been working to reduce the cost of that equipment, which is required to win wide-scale adoption.
- “We have made great progress on reducing the cost of our terminal,” she said. That equipment originally cost about $3,000. “We’re less than half of that right now.”
- Customers currently pay about $500 for that equipment, meaning that SpaceX is still significantly subsidizing those terminals. That may change, though, as the company makes continued progress to lower costs. “We do see our terminals coming in the few-hundred-dollar range within the next year or two.”
- Shotwell appeared on a panel with executives of several other satellite operators, many of whom argued that hybrid systems that use satellites in low and medium Earth orbits as well as geostationary orbit, or GEO satellites alone, offer better solutions. “We see absolutely no way, no possibility, that those low-orbit constellations can fulfill the latent demand of all the unserved population today,” said Rodolphe Belmer, chief executive of Eutelsat.
- As Belmer and other executives on the panel expressed their reservations about LEO constellations, Shotwell smiled. “I just always smile, by the way, when people make projections about what can and can’t be done with technology,” she said. “I don’t think we have any idea how technology can evolve five years from now.”
• Launch 23: A SpaceX Falcon 9 launched another set of Starlink satellites 24 March 2021, 15 years to the day after the company’s first, unsuccessful launch. 55)
- The Falcon 9 lifted off from Space Launch Complex 40 at Cape Canaveral Space Force Station at 08:28 UTC (4:28 a.m. EDT). The rocket’s upper stage deployed its payload of 60 Starlink satellites into low Earth orbit 64 minutes later.
- The rocket’s first stage, on its sixth flight, landed on a droneship in the Atlantic Ocean eight and a half minutes after liftoff. That booster, which first launched last June carrying a GPS satellite, also launched Turksat 5A in January as well as three other Starlink missions.
- This launch, by coincidence, took place exactly 15 years after SpaceX conducted the first launch of its Falcon 1 rocket from Kwajalein Atoll in the Pacific Ocean. That March 24, 2006, launch was unsuccessful, as the first stage’s single engine failed about half a minute after liftoff.
- Two subsequent Falcon 1 launches also failed before the fourth Falcon 1 launch, carrying a test payload, reached orbit in September 2008. The Falcon 1 flew one more mission in 2009 before SpaceX retired the vehicle in favor of the far larger Falcon 9, which has become the company’s workhorse with more than 110 launches since its introduction in 2010.
- This launch was the ninth Falcon 9 mission of 2021 and the fourth this month. Seven of those nine launches, including all four in March, have been dedicated to Starlink, increasing the size of the constellation to more than 1,300 satellites.
Growing capacity and international expansion
- The growth of that constellation has been enabled by both the high launch cadence of the Falcon 9 and mass production of satellites. “We’re currently building roughly six satellites a day at our factory in Seattle, which is pretty remarkable,” Jonathan Hofeller, SpaceX vice president for Starlink, said at Spacetide, a Japanese space business conference, held online March 23. He said the company has maintained that production rate for about a year so far.
- The satellites launched to date, he said, are all first-generation, or “Gen 1,” spacecraft. “We’re already working on the Gen 2 constellation,” he said. “These satellites will be continuously refreshed as we continue to increase both the network capacity and the density by orders of magnitude. We’re excited to be able to eventually provide a lot more internet than we’re even doing now.” He didn’t disclose additional details about the Gen 2 satellites or their schedule.
- SpaceX plans to have global coverage for Starlink by the end of this year. However, as the company expands beta tests in the United States and several other countries, Hofeller noted that the satellite constellation alone is just one element of that rollout. Other key factors include establishing ground stations to serve as gateways as well as the regulatory process, which varies from country to country.
- Japan, he suggested, is one the countries where that regulatory process is stretched out. Hofeller said the company identified Japan as a country where it wanted to provide service relatively early, and thanked those who have advocated for Starlink to Japanese regulators. “Anything they can do to speed up the regulatory process will be greatly appreciated,” he said, projecting that Starlink service could begin in Japan “as soon as the very end of this year.”
- SpaceX has largely marketed Starlink directly to consumers, a move he said is intended to reduce costs to those customers while also providing a direct feedback loop to SpaceX to help it improve the service. However, as the company expands Starlink into other markets, which range from backhaul services for telecommunications providers to mobility applications, Hofeller said the company would be open to working with partners.
- “We are a rocket company,” he said. “As we grow the capacity, it could be inevitable that we have partners globally.”
• Launch 22: A Falcon 9 launched another set of 60 Starlink satellites March 14, 2021, with the rocket’s first stage setting a record with its ninth launch and landing. 56)
- The Falcon 9 lifted off from Launch Complex 39A at the Kennedy Space Center at 6:01 a.m. EST (10:01 UTC) . The upper stage deployed its payload of 60 Starlink satellites into orbit 65 minutes later, bringing the size of the broadband internet constellation to 1,260 satellites.
- The launch was the eighth for the Falcon 9 this year, and took place a little more than 72 hours after another Falcon 9 launch of Starlink satellites. Six of the eight Falcon 9 launches this year have been dedicated to Starlink, and one of the other two, the Transporter-1 dedicated rideshare flight, also carried 10 Starlink satellites.
- The rocket’s first stage landed on a droneship in the Atlantic Ocean eight and a half minutes after liftoff. That booster was on its ninth flight, a record for the Falcon 9. The rocket, which first launched a Crew Dragon spacecraft on the uncrewed Demo-1 mission in March 2019, later launched the RADARSAT Constellation Mission and the SXM-7 satellite for SiriusXM. It launched five Starlink missions before this one, including the booster’s previous flight Jan. 20.
- The booster is now approaching the goal SpaceX set of being able to fly 10 times. However, one company official recently said it may be possible to exceed that goal.
- “We’re learning a lot about refurbishment and we’re learning where the areas are where we need to pay attention to,” said Hans Koenigsmann, senior adviser for build and flight reliability at SpaceX, during a panel discussion at the 47th Spaceport Summit last month. Those areas that require special attention include the booster’s heat shield and engine components. “We’ve been learning with every single landing.”
- Some of those lessons have been hard ones. One booster failed to land after a Feb. 15 launch, breaking a streak of successful landings lasting nearly a year. The company later said an engine shut down during flight when hot gas got through a hole in an engine cover that was a “life leader” in the Falcon 9 fleet, with more launches than any others in the Falcon 9 fleet. The shutdown meant the booster did not have enough thrust for a landing on a droneship.
- “The more you fly, the more you learn,” Benji Reed, senior director for human spaceflight programs at SpaceX, said of the failed landing at a March 1 briefing about the upcoming NASA Crew-2 commercial crew mission. “That’s a great lesson that we learned from these very long life leader components and vehicles.” Those lessons, he said, included revised plans to inspect and replace components.
- Once a booster reaches the milestone of 10 flights, “we will continue to look at that booster and make an assessment whether we can move forward with it,” Koenigsmann said. He suggested the booster may be able to continue to operate, perhaps after replacing some components that wear out. “I don’t think the number 10 is a magic number.”
• Launch 21: A SpaceX Falcon 9 launched another set of 60 Starlink satellites March 11, 2021 (08:13 UTC) as the company expanded international service in several countries. 57)
- The Falcon 9 lifted off from Space Launch Complex 40 at Cape Canaveral Space Force Station at 3:13 a.m. EST. The rocket’s upper stage deployed its payload of 60 Starlink satellites 65 minutes after liftoff.
Figure 22: A Falcon 9 launch March 11 brought the total number of Starlink satellites in orbit to 1,200 (image credit: SpaceX webcast)
- SpaceX now has 1,200 Starlink satellites in orbit, having launched 310 of them this year alone. Five of SpaceX’s seven Falcon 9 missions in 2021 have been dedicated for Starlink, with the other two launching Transporter-1 and the TurkSat-5A geostationary communications satellite. The Transporter-1 launch included 10 Starlink satellites, the first deployed into polar orbit.
- As SpaceX expands the Starlink satellite constellation, the company is also expanding the coverage for its ongoing beta test of the broadband internet service those satellites provide. The company originally limited the beta test to the northern tier of the continental United States, later expanding it to include southern Canada and parts of the United Kingdom.
- During the webcast for this Starlink launch, the company said it is now expanding its service in the U.K., which had been limited to southern England, to the rest of England, Scotland and Wales. SpaceX is also starting service in western Germany and the South Island of New Zealand, with plans to expand in both countries in the coming weeks.
- SpaceX has kept expectations low for the beta test, called “Better Than Nothing” by the company, with average speeds of 50 to 150 Mbit/s and occasional outages. In online forums, though, some users have reported much higher speeds at times, exceeding 300 Mbit/s, but still with intermittent outages.
• Launch 20: Launching through a blanket of low-hanging clouds and light mist, a SpaceX Falcon 9 rocket thundered into the sky over Florida’s Space Coast early Thursday and delivered 60 more Starlink internet satellites to orbit. The rocket’s first stage touched down on SpaceX’s floating landing platform in the Atlantic Ocean to complete its eighth trip to space and back. 58)
Figure 23: A Falcon 9 rocket disappears in a blanket of clouds shortly after launching from NASA’s Kennedy Space Center early Thursday. (image credit: SpaceX)
- The successful landing marked the 75th intact recovery of a Falcon rocket booster since December 2015. The booster on Thursday mission — designated B1049 — made its eighth launch and landing after debuting in September 2018, tying another first stage for the most number of flights in SpaceX’s fleet.
- A Falcon 9 booster on SpaceX’s previous launch Feb. 15 failed to land on the drone ship after one of its nine main engines shut down prematurely during ascent.
- After reaching a preliminary parking orbit, the upper stage coasted halfway around the world before firing its engine again for a one-second orbit adjustment burn over the Indian Ocean. The 60 Starlink satellites deployed from the Falcon 9’s upper stage at 4:29 a.m. EST (09:29 GMT) while flying 172 miles (278 km) above Earth just south of New Zealand.
- The on-target launch came after a series of delays kept the mission grounded since late January. The delays were caused by weather and unspecified technical issues, and two other Falcon 9 missions with Starlink satellites took off from nearby pad 40 at Cape Canaveral Space Force Station while the flight from pad 39A stayed earthbound.
- The change in the order of missions meant the batch launched Thursday was on the 20th Falcon 9 flight dedicated to carrying Starlink satellites, despite its designation on the military-run Eastern Range as Starlink V1.0-L17. Launches No. 18 and 19 ended up flying before No. 17.
- The 60 Starlink satellites, each weighing about a quarter-ton, will unfurl their solar panels and switch on ion krypton thrusters to begin raising their altitude to 341 miles (550 km) in the coming weeks. At that altitude, the satellites will join more than 1,000 active Starlink satellites flying in orbits inclined 53 degrees to the equator, taking them above nearly all of the world’s populated regions.
- SpaceX has launched 1,205 Starlink satellites to date with the 60 fresh relay stations delivered to orbit Thursday. But 63 of the Starlinks have been intentionally deorbited or re-entered the atmosphere after failing, and another 20 are not maneuvering or appear to be in the process of deorbiting, according to a tally of Starlink satellites from Jonathan McDowell, an astronomer and respected tracker of spaceflight activity.
- SpaceX is well on the way to finish deployment of its initial tranche of 1,584 Starlink stations — including spares — later this year. SpaceX won’t stop there, with plans to launch additional orbital “shells” of Starlink satellites into polar orbit to enable global coverage, with a first-generation fleet totaling some 4,400 spacecraft.
- The Federal Communications Commission has authorized SpaceX to eventually operate up to 12,000 Starlink satellites.
- The company is already providing an interim level of service over parts of the Earth, such as Canada, northern parts of the United States, and the United Kingdom. Beta testing of the Starlink services is already underway with users in those regions. SpaceX is also accepting pre-orders from Starlink consumers, who can pay $99 to reserve their place in line to get Starlink service when it becomes available in their area. For people in the southern United States and other lower-latitude regions, that should come by late 2021, SpaceX says.
- Once confirmed, customers will pay $499 for a Starlink antenna and modem, plus $50 in shipping and handling, SpaceX says. A subscription will run $99 per month.
• Launch 19: SpaceX successfully launched another Falcon 9 rocket carrying a set of 60 Starlink V1.0 minisatellites into space on 16 February 2021 (03:59 UTC, corresponding to 10:59 p.m. EST on 15 February) from Cape Canaveral SLC-40. The SpaceX rocket released its payload of 60 Starlink satellites in orbit 65 minutes after liftoff. 59)
Figure 24: A set of 60 Starlink satellites deploys from the upper stage of its Falcon 9 rocket to conclude a Feb. 15 launch (image credit: SpaceX webcast)
- This time around, the rocket's first stage suffered a rare failed landing. The first stage did not land on a droneship in the Atlantic Ocean as planned. Video from the droneship around the time of landing showed a glow in the distance, suggesting a problem with the booster that either caused it to go off-course or to deliberately divert from the landing attempt. SpaceX did not immediately disclose what took place during the failed landing.
- The failure broke a streak of 24 consecutive Falcon 9 launches with successful landings, either on droneships or on land. The last failure took place in March 2020, and was the second failure in three Falcon 9 launches. The March failure was caused by engine cleaning fluid that was trapped inside and interfered with a sensor, while the earlier failure was blamed on incorrect wind data.
- The booster on this launch made its sixth flight. It first flew in December 2019 on a cargo Dragon mission, then was used for another cargo Dragon in March 2020. It subsequently launched a set of Starlink satellites, along with three SkySats for Planet, in June, followed by SAOCOM-1B in August and the NROL-108 mission for the National Reconnaissance Office in December.
- The primary purpose of the mission, though, was a success, adding to the growing constellation of Starlink satellites. SpaceX is expanding its beta testing program, and now has more than 10,000 users in the United States, Canada and the United Kingdom, according to a Feb. 3 filing with the Federal Communications Commission.
- SpaceX, though, is facing renewed opposition from some organizations regarding the nearly $885.5 million in FCC Rural Digital Opportunity Fund (RDOF) awards it won in December. In a recent white paper, the National Rural Electric Cooperative Association and National Rural Telecommunications Cooperative (NRTC) argued that the FCC should closely scrutinize SpaceX’s plans to provide broadband internet service via satellite. Those groups say bids by rural cooperatives for RDOF funding to provide broadband service were shut out by both SpaceX as well as fixed wireless networks.
- “I’m really struggling on the physics and economics” of satellite broadband, said Tim Bryan, chief executive of the NRTC, in a Feb. 4 call with reporters. He claimed there were “anecdotal reports” of people who signed up for Starlink beta but were having problems getting connections any faster than four megabits per second, but didn’t elaborate.
- “Starlink’s performance is not theoretical or experimental,” SpaceX noted in its Feb. 3 FCC filing. The company said it had already demonstrated it could meet or exceed key performance tiers, including 100 megabits per second of data to customers and 20 megabits per second of data from them, as well latencies of 31 milliseconds or less.
- Bryan said his group’s issue was how Starlink could scale up to serve larger numbers of customers. “My concern is mostly around the capacity not of one or two users, but what happens when you get to 20 or 30 or 40 or 50 thousand users,” he said.
- “I have no doubt that the Starlink constellation could be successful in some areas, and in some cases, providing coverage over areas like the deep blue seas and those sorts of places,” he said. “I struggle to see how it’s going to reliably deliver 100-megabit service to the literally hundreds and thousands of customers in the census block groups that it bid for.”
• Launch 18: SpaceX successfully launched another set Starlink satellites February 4, 2021 in the first of back-to-back Falcon 9 launches scheduled from Cape Canaveral. The Falcon 9 rocket lifted off at 1:19 a.m. Eastern (06:19 UTC) from Space Launch Complex 40 at Cape Canaveral Space Force Station. Its payload of 60 Starlink satellites separated from the rocket’s upper stage 65 minutes later. 60)
- The rocket’s first stage landed on a droneship in the Atlantic Ocean eight and a half minutes after liftoff. The booster was on its fifth flight, having been used most recently for the launch of the Turksat 5A satellite Jan. 8.
- The launch is the first of two back-to-back Falcon 9 Starlink missions from Florida. A second Falcon 9 is scheduled to launch Feb. 5 from Launch Complex 39A at the Kennedy Space Center, also carrying 60 Starlink satellites.
- For a time, SpaceX planned launching both rockets Feb. 4, less than four and a half hours apart. The company said late Feb. 2 that the launch doubleheader was pending favorable weather and range approvals. While the 45th Space Wing announced Feb. 3 that it approved SpaceX’s launch plans, the company announced later that day it was delaying the launch from LC-39A, which had been scheduled for 5:36 a.m. Eastern, by a day for additional pre-launch checks. — Note: The next launch of SpaceX with a set of 60 Starlink satellites is now postponed to February 15.
- The last time two launches took place from the Eastern Range, which includes Cape Canaveral Space Force Station and KSC, in a single day was in November 1966, with launches of NASA’s Gemini 12 mission and its Atlas Agena docking target 99 minutes apart. SpaceX proposed carrying out two Falcon 9 launches in one day in August 2020, but one of the two launches was scrubbed by weather.
• Launch 17: SpaceX first Rideshare mission called Transporter-1. On January 24, 2021 at 15:00 UTC (10 a.m. EST), SpaceX launched a Falcon 9 Block 5 rocket from the Cape Canaveral Air Force Station (SLC-40) with 143 small satellites, a record number of spacecraft on a single mission, giving a boost to startup space companies and stressing the U.S. military’s tracking network charged with sorting out the locations of all objects in orbit. 61)
- This SpaceX mission carried also 10 Starlink satellites into orbit. The other satellites on this Rideshare mission will be listed in the separate Transporter-1 file on the eoPortal.
- SSO orbit of Rideshare mission:
SpaceX sent this mission with its 10 Starlink satellites into a polar
SSO (Sun-Synchronous Orbit) with permission of the FCC (Federal
Communications Commission). Altitude of 560 km and inclination of
97.6º (Ref. 96).
Figure 25: This photo shows the stack of 143 small satellites aboard SpaceX’s Transporter-1 mission before encapsulation inside the Falcon 9 rocket’s payload shroud (image credit: SpaceX)
• Launch 16: SpaceX launched its latest set of 60 Starlink satellites Jan. 20, 2021, bringing the total number of spacecraft launched so far for that broadband constellation to more than 1,000. 62) 63)
- The rocket’s first stage, making its eighth flight, landed on a droneship in the Atlantic Ocean. SpaceX cautioned during the webcast of the launch that the potential for high ground-level winds made the landing an “envelope expansion” attempt. However, the stage landed without incident in the center of the droneship.
- The launch was the first time SpaceX flew a booster eight times. The booster, first used to launch the Demo-1 commercial crew test flight in March 2019, was most recently flown on the SXM-7 launch Dec. 13. The 38-day turnaround time between launches is also a record for the shortest time between flights of the same booster.
- With this launch, SpaceX has now delivered 1,015 Starlink satellites into orbit, dating back to the two “Tintin” prototypes launched in February 2018. Of those 1,015, 951 are still in orbit, according to statistics maintained by spaceflight observer Jonathan McDowell.
- SpaceX ramped up deployment of Starlink last year, with 14 launches. The rapid growth of the constellation has alarmed astronomers, who are concerned that Starlink and other megaconstellations could disrupt their observations.
- Speaking during a session of the 237th Meeting of the American Astronomical Society Jan. 14, Patricia Cooper, vice president of satellite government affairs at SpaceX, argued that the company has taken major steps to reduce the impact of Starlink satellites on astronomy over the last year.
- “We at SpaceX have certainly enjoyed what I would call a thoughtful and creative technical collaboration with an ever-widening group of astronomers,” she said, resulting in a “deeper and fuller technical understanding of the intersection of the satellite constellation sector and specific projects affect ground-based astronomy.”
- That has resulted in the development of a version of the Starlink satellites called VisorSat, which is equipped with visors to prevent sunlight from reflecting off antennas and other surfaces on the satellites, reducing their brightness. Every Starlink satellite launched after August 2020 is equipped with visors, accounting for more than 400 satellites, she said.
- The goal of the VisorSats is to reduce the brightness of the Starlink satellites to magnitude 7 or fainter. Observations of those satellites that have reached their final orbit, though, indicate they have an average magnitude of 6.5, said Pat Seitzer of the University of Michigan during the conference session.
- Cooper said SpaceX is committed to continue to work with astronomers to mitigate the effect of Starlink, but also emphasized the benefits of the system. “It’s important to keep the purpose of this disruption to astronomy, from your perspective, in context of the goal of the constellation we’re deploying, which is broadband connectivity,” she said.
- “This collaboration needs to continue,” she added, because those discussions are “what’s getting us to a much better, more successful way of coexisting.”
Figure 26: A Falcon 9 rocket, flying with a first stage flown on seven previous missions, climbs through the atmosphere Wednesday (20 January) over Florida’s Space Coast (image credit: SpaceX)
• Launch 15: The 100th flight of a Falcon 9 rocket delivered 60 satellites to orbit for SpaceX’s Starlink network on 25 November 2020 (02:13 UTC, corresponding to 09:13 p.m. EST on 24 November), adding another building block to a planned fleet of thousands of solar-powered space-based relay stations to beam broadband connectivity around the world. 64)
Figure 27: A Falcon 9 rocket climbs away from pad 40 at Cape Canaveral Air Force Station on 24 November 2020 (image credit: SpaceX)
- The successful mission also set a new record for SpaceX’s rocket reuse program — one that could be broken again within months if SpaceX maintains its feverish launch cadence. For the first time, a reusable Falcon 9 booster completed its seventh trip to space and back on this flight.
- The rocket's 15-story first stage booster dropped away from the Falcon 9 upper stage about two-and-a-half after liftoff, setting a course for a controlled touchdown on SpaceX’s drone ship “Of Course I Still Love You” positioned several hundred miles northeast of Cape Canaveral in the Atlantic Ocean.
- The booster — designated B1049 in SpaceX’s rocket inventory — reignited its center engine for a braking maneuver just before touchdown, then extended a landing gear before settling onto the deck of the drone ship. The apparently flawless landing punctuated the seventh mission of the B1049 vehicle, making it SpaceX’s “fleet leader.”
- Along with its reused first stage booster, the Falcon 9 launched with a recycled clamshell-like payload shroud, half of which flew on two previous missions. The other half of the fairing was a veteran one prior launch.
- While the booster and fairing shells descended back to Earth, the Falcon 9’s upper stage guided the 60 flat-panel Starlink satellites into a transfer orbit inclined 53 degrees to the equator. Around 15 minutes after liftoff, the upper stage released retention rods to allow the stack of 60 spacecraft to fly free from the rocket over the North Atlantic Ocean.
- The Falcon 9 aimed to place the satellites into an elliptical orbit ranging between 132 miles (213 km) and 227 miles (366 km). A member of SpaceX’s launch team confirmed on a mission audio loop that the rocket achieved an on-target orbital insertion.
- The quarter-ton Starlink satellites, built by SpaceX in Redmond, Washington, were expected to unfurl power-generating solar arrays and prime their krypton ion thrusters to begin raising their orbits to an operational altitude of 341 miles (550 km), where they will join more than 800 other Starlink relay stations to beam broadband internet signals across most of the populated world.
- With this launch, SpaceX has deployed 955 Starlink satellites into orbit.
• Launch 14: SpaceX successfully deployed 60 more Starlink internet satellites in orbit Saturday, continuing a record launch cadence while engineers assess a concern with Falcon -9 rocket engines that has delayed other missions, including the next crew flight to the International Space Station. 65)
- The 60 Starlink satellites were launched from SLC-40 at Cape Canaveral Air Force Station at 15:31:34 GMT on 24 October 2020. The mission was delayed from Thursday to allow time for engineers to assess a problem with a camera on the Falcon-9 rocket’s upper stage.
- The rocket’s first stage shut down its engines and separated two-and-a-half minutes into the mission, beginning a controlled descent to a pinpoint landing on a floating platform parked some 630 km northeast of the launch site.
- The landing concluded the third trip to space and back for the reusable Falcon-9 booster — designated B1060 — and the touchdown occurred moments before the rocket’s upper stage delivered the 60 Starlink satellites into a preliminary parking orbit.
- SpaceX did not try to catch the Falcon-9’s two-piece payload fairing as they fell back to Earth under parachutes. A nose cone structure damaged a net on one of SpaceX’s fairing recovery vessels on the company’s most recent launch Oct. 18.
- Instead, SpaceX dispatched one of the boats from its fleet to retrieve the fairing structures from the Atlantic Ocean for inspections, refurbishment, and potential use on a future flight.
- After coasting across the Atlantic Ocean, Europe and the Middle East, the Falcon-9’s upper stage briefly reignited its single engine at T+plus 44 minutes to inject the Starlink satellites into a near-circular orbit at an altitude of roughly 275 km with an inclination of 53º to the equator.
- All 60 satellites, which were flat-packed on top of the Falcon 9 rocket for launch, separated from the upper stage at 16:34 GMT. A live video feed from the rocket showed the flat-panel satellites receding from view as they flew south of Tasmania.
- The satellites, built by SpaceX in Redmond, Washington, were expected to unfurl power-generating solar arrays and prime their krypton ion thrusters to begin raising their orbits to an operational altitude of 550 km, where they will join more than 800 other Starlink relay stations to beam broadband internet signals across most of the populated world.
- SpaceX says the Starlink network — designed for low-latency internet service — is still in its early stages, and engineers continue testing the system to collect latency data and speed tests. In a filing with the FCC dated Oct. 13, SpaceX said it has started beta testing of the Starlink network in multiple U.S. states, and is providing internet connectivity to previously unserved students in rural areas.
Launch 13: SpaceX launched 60 more Starlink internet relay platforms into orbit on 18 October 2020 (Sunday, 12:25:57 UTC) from LC-39A at the Kennedy Space Center, as the company ramps up network testing in Washington state and touts a streak of nearly 300 satellites launched since June without a spacecraft failure. 66)
- After 2.5 minutes into the flight, the first stage booster shut down its engines and detached to begin descending toward SpaceX’s drone ship “Of Course I Still Love You” in the Atlantic Ocean.
- The first stage booster nailed its landing on SpaceX’s drone ship around 400 miles (630 km) northeast of Cape Canaveral. It was the sixth trip to space and back for this particular booster — designated B1051 — after its debut on an unpiloted test flight of the Crew Dragon spacecraft in March 2019.
- At the same time, the Falcon 9’s upper stage delivered the 60 Starlink internet satellites into a preliminary orbit. The upper stage engine later reignited to maneuver the payloads into a near-circular orbit 278 km above Earth, with an inclination of 53 degrees to the equator.
- The 60 flat-panel satellites separated from the rocket at 9:29 a.m. EDT (13:29 GMT) to conclude SpaceX’s 70th straight successful mission. A camera on the upper stage showed the 60 satellites — each with a mass of about a quarter-ton — flying free of the Falcon 9 over the Indian Ocean.
- SpaceX said its two fairing recovery ships caught both halves of the fairing from Sunday’s launch as the clamshells came back to Earth under parachutes. The net on one of the vessels gave way as the fairing settled into orbit, but SpaceX said its ocean-going recovery team was OK.
- With the satellites launched Sunday, SpaceX has placed 835 Starlink broadband relay stations into orbit, including prototypes that won’t be used for commercial service. That extends SpaceX’s lead in operating the largest fleet of satellites in orbit.
• October 18, 2020: With this launch, SpaceX has now placed 835 Starlink satellites into orbit. However, more than 50 of those satellites have since reentered, including 45 of the 60 “v0.9” Starlink satellites launched in May 2019 and the first two “Tintin” prototypes launched in February 2018. 67)
- Starlink is currently in a private beta test of its broadband internet system, and the company has said it plans to offer a more public beta test before the end of the year. In both the launch webcast as well as recent filings with the Federal Communications Commission, the company has highlighted early users of the system, such as the emergency management department in the state of Washington, which used Starlink to provide connectivity during recent wildfires in the state, as well as the Hoh tribe in the state, which previously had no broadband access because of its remote location.
- The launch is the second Starlink mission in less than two weeks as SpaceX seeks to maintain a rate of roughly two Starlink launches a month to build out the constellation. Those launches have moved ahead while another Falcon 9, carrying a GPS 3 navigation satellite for the U.S. Space Force, remains grounded after a last-second abort Oct. 2 blamed on a problem with gas generators in the rocket’s first-stage engines.
- That scrub led NASA to postpone a Falcon 9 launch of the Crew-1 commercial crew mission, which had been scheduled for Oct. 31. NASA announced Oct. 10 it was postponing the launch to the first half of November while the investigation into the scrub continues.
- NASA has not issued any updates on the status of the Crew-1 launch, although one NASA webpage lists a launch of no earlier than Nov. 11. “That investigation is ongoing,” Tim Dunn of NASA’s Launch Services Program said at an Oct. 16 briefing about the scheduled Nov. 10 launch of the Sentinel-6 Michael Freilich ocean science satellite, which will also use a Falcon 9.
- Dunn said that there has been a “tremendous amount of testing” since the GPS 3 launch scrub, including taking the Merlin engines from that rocket back to SpaceX’s McGregor, Texas, test site for further study. That investigation has involved NASA and Space Force personnel working with SpaceX.
- He did not elaborate, though, on the specific problem with the engines or when either the GPS 3 or Crew-1 missions might launch. “We’ve learned a lot. There’s going to be some hardware implications as we move forward, depending on the engines installed on various rockets,” he said.
- However, he did not expect the engine issue to delay the Sentinel-6 Michael Freilich launch. “As of today, we have a path forward that allows us to do whatever necessary rework may be required and still maintain that 10 November launch date.”
Launch12: Sixty more SpaceX Starlink broadband satellites rocketed into orbit on 6 October 2020 (11:29:34 UTC) from LC-39A at the Kennedy Space Center, breaking a streak canceled launch attempts at the Florida spaceport in recent weeks and nudging the Starlink network closer to reaching a wider population. 68)
- The Falcon 9’s first stage nailed the landing — the 61st successful recovery of a SpaceX rocket booster — as the second stage injected the mission’s 60 Starlink satellites into orbit.
- The reusable booster completed its third trip to space and back, following flights earlier this year to help send NASA astronauts Doug Hurley and Bob Behnken into orbit on a Crew Dragon capsule in May, and a launch in July with South Korea’s Anasis 2 military communications satellite.
- One half of the two-piece, clamshell-like payload fairing on this mission was also making its third flight. A recovery boat in the Atlantic caught the reusable fairing half again as it descended under a parachute.
- The Falcon 9’s upper stage ignited a second time to place the 60 Starlink payloads into an on-target near-circular orbit around 170 miles (275 km) above Earth, with an inclination of 53 degrees to the equator.
- The 60 flat-panel satellites separated from the Falcon 9’s upper stage around 12:31 GMT. A live video feed from the rocket showed the payloads drifting away into space.
- The 60 spacecraft, built by SpaceX in Redmond, Washington, were expected to unfurl solar panels and activate krypton ion thrusters to begin raising their altitude to 550 km, where they will begin providing broadband service.
- With this launch, SpaceX has deployed 775 Starlink satellites to date, including two prototype platforms and 773 satellites on 13 Falcon 9 launches since May 2019.
- SpaceX plans to operate an initial block of around 1,500 Starlink satellites in orbits 550 km above Earth. The company, founded by billionaire Elon Musk, has regulatory approval from the Federal Communications Commission to eventually field a fleet of up to 12,000 small Starlink broadband stations operating in Ku-band, Ka-band, and V-band frequencies.
Launch 11: The next 60 Starlink relay nodes blasted off on 3 September 2020 (Thursday, 12:46:14 GMT) from Cape Canaveral LC -39A on top of a Falcon 9 rocket, riding SpaceX’s workhorse launcher into orbit. 69)
- The Falcon 9’s reusable first stage booster landed on SpaceX’s drone ship “Of Course I Still Love You” holding position in the Atlantic Ocean a couple hundred miles east of Charleston, South Carolina.
- The propulsive pinpoint landing marked the 60th time SpaceX has recovered a Falcon 9 booster, and it completed the second trip to space and back for the specific rocket flown on Thursday.
Figure 28: A Falcon 9 rocket lifts off from pad 39A of Cape Canaveral, Florida, with 60 more Starlink satellites (image credit: SpaceX)
- Meanwhile, the Falcon 9’s upper stage engine injected the 60 Starlink satellites into an on-target orbit tilted 53 degrees to the equator. Retention rods released to allow the flat-panel satellites to fly free of the Falcon 9 rocket around 15 minutes after liftoff.
- SpaceX declared success on the mission, which was the company’s second launch in less than four days from separate pads on Florida’s Space Coast.
- After their deployment from the Falcon 9 rocket, the Starlink satellites were expected to extend solar panels and activate krypton ion thrusters to begin raising their orbit to the Starlink network’s operational shell roughly 550 km above Earth.
- With the 60 fresh satellites launched today, SpaceX has delivered 713 Starlink satellites to orbit on 12 Falcon 9 rocket missions since May 2019. Some of the satellites, including those on the first Starlink launch last May, are being moved to lower altitudes and deorbited.
- SpaceX eventually plans to launch thousands of Starlink satellites, but the first tranche of Starlinks will number 1,440 spacecraft, according to Jonathan Hofeller, SpaceX’s vice president of Starlink and commercial sales.
- Each flat-panel Starlink satellite has a mass of about 250 kg, and they are built at a SpaceX facility in Redmond, Washington, near Seattle. Extending on SpaceX’s penchant for building hardware in-house, the aerospace company is manufacturing its own Starlink satellites, user terminals and ground stations.
- Hofeller said last month that SpaceX is building six Starlink spacecraft per day, and plans to launch Starlink missions at intervals of every two to three weeks until completing the initial Starlink network of around 1,440 satellites.
- In a discussion at the ASCEND Space Science and Technology Summit last month, Hofeller said that the private beta testing is being rolled out in the Pacific Northwest. With roughly 700 satellites, the Starlink network has enough coverage to provide connectivity to users at high latitudes, but more launches are required to expand coverage to other regions.
- SpaceX has asked people interested in participating in the public beta test phase to sign up on the Starlink website.
- SpaceX said Thursday that the tests so far show the network has “super low latency” with download speeds greater than 100 Mbit/s. That’s fast enough to stream multiple HD movies at once, and still have bandwidth to spare, according to SpaceX.
Launch 10: A Falcon 9 rocket loaded with 58 more broadband relay nodes for SpaceX’s Starlink Internet network took off on 18 August 2020 (14:31:16 UTC) from Cape Canaveral LC40, bringing the total number of Starlink spacecraft launched since May 2019 to 653 satellites. 70)
- The reusable Falcon 9 booster that powered the 58 Starlink satellites toward space was making its sixth flight, setting a new record for SpaceX’s liquid-fueled rocket family.
- The fresh Starlink craft launched today widened SpaceX’s lead in fielding the largest fleet of satellites, and also added to the constellation of Earth-imaging satellites owned by Planet. Planet’s satellite fleet is the second-biggest after SpaceX’s Starlink network.
- Three commercial SkySat Earth observation satellites hitched a ride into orbit on the Falcon 9 rocket, joining around 150 other small spacecraft in the Planet’s fleet.
- Two-and-a-half minutes after liftoff, the Falcon 9’s first stage shut down its nine Merlin engines and separated to begin a descent toward SpaceX’s drone ship “Of Course I Still Love You” positioned in the Atlantic Ocean around 400 miles (630 km) northeast of Cape Canaveral.
- After ignition of the Falcon 9’s upper stage engine, the rocket shed its clamshell-like payload shroud at T+plus 3 minutes, 12 seconds. The two halves of the nose cone came back to Earth under parachutes for retrieval by a pair of SpaceX recovery boats.
- The 15 story first stage nailed its return to SpaceX’s offshore landing platform nearly nine minutes after liftoff, completing its sixth round-trip flight to space and back. That’s a new record for SpaceX’s fleet of Falcon boosters, which previously had flown no more than five times a piece.
- Designated B1049 in SpaceX’s fleet, the booster used on Tuesday’s mission first flew from Cape Canaveral in September 2018 in the launch of Telesat’s Telstar 18 VANTAGE communications satellites. After landing on a SpaceX drone ship, the booster launched again from California in January 2019 with 10 Iridium voice and data relay satellites, and again returned to a propulsive touchdown on an offshore recovery vessel.
- The Falcon first stage launched three more times with satellites for SpaceX’s Starlink broadband network, most recently on June 3. SpaceX says the Falcon 9’s first stage booster is capable of at least 10 flights without a major overhaul, though engineers perform routine inspections and refurbishment between each mission.
- SpaceX later confirmed one of the two halves of the payload shroud used on Tuesday’s launch was successfully caught by a net aboard one of the company’s two fairing recovery vessels. The other fairing clamshell parachuted into the Atlantic Ocean and will be retrieved for return to Cape Canaveral, SpaceX said. — The fairing on today’s mission was reused from a previous Falcon 9/Starlink launch.
- The Falcon 9’s upper stage delivered its 61 satellite passengers into an on-target elliptical orbit around Earth ranging in altitude between 128 miles (207 km) and 229 miles (370 km). The three SkySats, mounted on top of the Starlink satellite array, separated at 30-second intervals beginning about 12-and-a-half minutes into the mission.
- After flying halfway around the world, the upper stage released the 58 Starlink payloads over the Indian Ocean about 46 minutes after liftoff.
- Beginning with the Starlink launch earlier this month, SpaceX says all of the Starlink satellites are equipped with sunshade visors (see Figure 31) to reduce their reflectivity, a measure aimed at mitigating concerns that thousands of Starlink spacecraft might interfere with astronomical observations using ground-based telescopes.
- SpaceX says it needs 24 launches to provide Starlink Internet coverage over nearly all of the populated world, and 12 launches could enable coverage of higher latitude regions, such as Canada and the northern United States.
- SkySats: The three Planet-owned Earth observation satellites deployed in orbit Tuesday are the last three of 21 SkySat high-resolution reconnaissance platforms the San Francisco-based company plans to launch.
- The SkySats join 18 others Planet has launched aboard U.S., European and Indian rockets since 2013, supplying regularly-updated sharp images of the world’s cities, forests, farms, waterways, and other regions of interest to government and commercial users.
- Planet confirmed its ground team acquired the first radio signals from all three satellites minutes after Tuesday’s launch, confirming the spacecraft were alive and well in orbit.
- The SkySats offer Planet’s customers high-resolution views of Earth, while a flock of more than 100 smaller Dove CubeSats provide wider area coverage at lower resolution.
- Planet launched three identical SkySats on a Falcon-9/Starlink launch June 13, and the three new spacecraft launched on 18 August will bring the SkySat fleet to 21 satellites.
- The SkySats taking off on rideshare missions with SpaceX’s Starlink satellites fly at a lower-inclination orbit inclined 53º to the equator. Planet says the new satellites “will offer more targeted coverage and raw image capacity in key geographic regions.”
Figure 29: Three Planet SkySat Earth-imaging satellites (SkySat-19, -20 and -21) accompanied 58 SpaceX Starlink satellites on a Falcon-9 rocket on Launch 11 (image credit: SpaceX)
Launch 9: On 7 August 2020 (05:12:05:UTC), SpaceX launched their 10th Starlink mission, carrying 57 minisatellites and two commercial microsatellites of the BlackSky Global (a division of Spaceflight Industries) Earth observation constellation of Seattle WA, USA (BlackSky's fifth and sixth satellites - named Global 7 and 8, each with a mass of 55 kg). The launch site was LC-39A (Launch Complex 39A) at NASA’s Kennedy Space Center in Florida. The launch vehicle was Falcon-9. With this launch, SpaceX will have delivered 595 Starlink satellites to orbit since May 2019. 71) 72)
Figure 30: BlackSky’s fifth and sixth operational Earth-imaging satellites are pictured inside a SpaceX processing facility at Cape Canaveral (image credit: SpaceX)
The mission was previously scheduled for 26 June, but the flight was scrubbed around three hours ahead of liftoff when SpaceX tweeted that they needed more time for pre-launch checkouts.
According to SpaceX, Falcon 9’s first stage previously supported Crew Dragon’s first demonstration mission to the International Space Station, the launch of the RCM (RADARSAT Constellation Mission), and the fourth and seventh Starlink missions.
Following stage separation, Falcon 9’s first stage landed on the “Of Course I Still Love You” droneship stationed in the Atlantic Ocean.
The BlackSky Global spacecraft deployed sequentially beginning 1 hour and 1 minute after liftoff, and the Starlink satellites deployed approximately 1 hour and 33 minutes after liftoff.
This is the first launch of SpaceX to carry a full set of Starlink satellites equipped with new sunshades, or visors, in an attempt to make the spacecraft less visible to ground-based telescopes, addressing concerns voiced by astronomers that thousands of Starlink satellites could interfere with scientific observations.
Figure 31: SpaceX plans to debut a new sunshade structure on its future Starlink satellites (image credit: SpaceX)
Launch 8: On June 13, 2020 (9:21 UTC), SpaceX successfully launched their ninth Starlink mission, carrying 58 Starlink satellites and three of Planet’s SkySat Earth Observation microsatellites (110 kg each) from the Cape Canaveral Air Force Station in Florida — this mission marked SpaceX’s first SmallSat Rideshare Program launch. 73)
- SpaceX deployed the SkySat satellites first, about 13 minutes after liftoff, followed by the Starlink satellites about 39 minutes after liftoff.
- The mission used a Falcon 9 booster that flew two cargo missions to the International Space Station for NASA, the last being CRS-20 in March. The rocket featured a previously flown payload fairing, with one half recovered from the Jcsat-18/Kacific-1 satellite mission in December, and the other from SpaceX’s third Starlink mission, which took place in January.
- SpaceX recovered the rocket’s first-stage for a third time, landing the booster on the drone ship “Of Course I Still Love You” in the Atlantic Ocean.
- SpaceX Lead Manufacturing Engineer Jessie Anderson said the launch contract covering Planet’s three SkySat satellites was signed six months ago. Planet’s Saturday launch, and a second Starlink rideshare scheduled for July will complete the operator’s constellation of 21 SkySats, a fleet that complements Planet’s larger constellation of Dove CubeSats.
- Once all 21 SkySats are in orbit, Planet says it will be able to image locations an average of seven times a day, with some locations seeing up to 12 revisits a day, at 50-centimeter resolution. Planet’s CubeSats collect imagery in 3-5 meter resolution.
- Another Earth-observation company, BlackSky, said in a recent interview that it has two satellites scheduled to launch June 24 on a Starlink rideshare mission. Barring schedule slips, that would be three Starlink launches in June, which would be the highest number of Starlink launches conducted in a month.
- SpaceX was targeting two Starlink launches a month throughout 2020, but has averaged one Starlink launch a month so far. The company has launched 540 Starlink satellites to date, counting two prototypes, out of a planned system comprising several thousand.
Launch 7: On June 4 2020 (01:25 UTC, or at 9:25 pm EDT on June 3), SpaceX launched the eighth batch of Starlink communication satellites on a flight-proven Falcon 9 rocket from Cape Canaveral’s Space Launch Complex 40 (LC-40). The successful launch boosted the number of Starlink satellites circling the Earth to 480, by far the greatest number of any communications network. 74)
- At about 2 minutes, 45 seconds after launch, the nine main engines of the rocket's first stage shut off, and that stage re-entered the Earth's atmosphere for recovery off Florida on the SpaceX barge named Just Read the Instructions. - The first stage landed mostly inside a bull's-eye on the flat deck.
- The second stage carried the satellites into orbit successfully, SpaceX engineers said. Video showed the Starlink cluster deploying roughly 15 minutes after liftoff.
- The size of the Starlink constellation already is large enough for "minor" Internet coverage around the world, according to SpaceX founder Elon Musk's statements to the press before the first Starlink launch in 2019.
- But SpaceX hasn't released more information about the network's operation or its intended customers.
- Starlink aims to provide next-generation broadband Internet service to the globe, outpacing that offered by such players as Iridium or Intelsat. SpaceX said in 2019 it aimed to launch 1,600 satellites in the first phase.
- At that point, the satellites would transmit data to each other via laser pulses through the vacuum of space — a far faster method than even fiber optic cables on Earth.
- Starlink, which the company said could cost $10 billion to develop and launch, has boosted the value of SpaceX and its recent rounds of investment, according to stock analysts and SpaceX's filings with the Securities and Exchange Commission.
- SpaceX raised $567 million, according to the commission documents filed in the last few months.
- "We are modeling for $10 billion to $15 billion from 2020-2025 for Starlink, with the potential for more from ground terminals, 30,000 additional satellites and replacement of satellites" and other SpaceX endeavors, according to a recent note from analysts at Morgan Stanley.
- Starlink also would owe some of its speed to its much lower orbit than previous communication satellite networks — 340 miles (550 km) up.
- By comparison, Iridium satellites are about 485 miles (780 km ) up. The Kármán line that defines space is 62 miles high, and the International Space Station is more than 250 miles (400 km) high.
- On this mission, SpaceX was to launch the first Starlink satellite with a visor to block sunlight from hitting the brightest spots of the spacecraft. Musk announced April 27 that the sunshade, which he called a VisorSat, would be included in the next Starlink launch.
- VisorSat is designed to prevent the satellites from reflecting sunlight back to the Earth, which can interrupt astronomy observations.
- This was the second Starlink launch during restrictions on access to the Air Force station due to the coronavirus pandemic. The launch also came on the heels of Saturday's (31 May) successful SpaceX launch of the first flight of NASA astronauts from U.S. soil since 2011.
- The first-stage booster for this launch previously flew four times, including the launch of an Iridium satellite in January 2019, and two separate Starlink missions in May 2019 and January 2020.
Launch 6: On 22 April 2020 (19:30: 30 UTC), SpaceX launched 60 more Starlink satellites from Launch Complex 39A (LC-39A) at NASA’s Kennedy Space Center in Florida. 75)
Two-and-a-half minutes after liftoff, the Falcon 9’s first stage booster shut down and separated to begin a controlled descent back into the atmosphere. The rocket’s single-engine upper stage ignited seconds later, and the Falcon 9 released its clamshell-like payload fairing more than three minutes into the mission.
Flying into space for the fourth time, the reusable first stage nailed a pinpoint landing on SpaceX’s drone ship in the Atlantic Ocean east of Charleston, South Carolina. Two recovery ships were stationed in the Atlantic to retrieve the rocket’s two-piece payload shroud, which was also recycled from a previous flight.
The satellites were each expected to extend their power-generating solar panel wing go through an activation sequence. Krypton ion thrusters on the spacecraft will boost them from their preliminary elliptical transfer orbit to an operational altitude of 550 km over the coming weeks and months.
With this launch, SpaceX has delivered 422 Starlink satellites to space, including two prototypes that are now being deorbited. Since last May, SpaceX has orbited 420 Starlink spacecraft. Three of those relay stations are no longer in orbit, according to publicly-available U.S. military tracking data.
Launch 5: SpaceX launched their 6th Starlink mission of 60 satellites on March 18, 2020 (12:16 UTC). The company's Falcon 9 launch vehicle lifted off from Launch Complex 39A (LC-39A) at NASA’s Kennedy Space Center in Florida. 76) 77)
Falcon 9’s first stage previously supported the Iridium-7 NEXT mission in July of 2018, the SAOCOM 1A mission in October of 2018, the Nusantara Satu mission in February of 2019, and the second launch of Starlink in November of 2019. Falcon 9’s fairing previously supported the first launch of Starlink in May 2019.
he Starlink satellites deployed in an elliptical orbit approximately 15 minutes after liftoff. Prior to orbit raise, SpaceX engineers conducted data reviews to ensure all Starlink satellites are operating as intended. Once the checkouts are complete, the satellites will then use their onboard ion thrusters to move into their intended orbits and an operational altitude of 550 km.
An attempt to land the Falcon 9's first stage in the Atlantic Ocean on SpaceX's drone ship "Of Course I Still Love You" was unsuccessful.
And despite the loss of one of its nine engines, SpaceX CEO Elon Musk said they were still able to deliver the 60 Starlink satellites on board the Falcon 9, which went exactly as planned. That’s due in part to the redundancy built into the design of the Falcon 9 launch vehicle, which uses nine Merlin engines working together.
Launch 4: On February 17, 2020 (15:06 GMT), 60 more satellites for SpaceX’s Starlink broadband network launched Monday on a Falcon 9 rocket from Cape Canaveral, bringing the total number of Starlink platforms deployed in orbit since last May to 300. 78)
Two-and-a-half minutes into the mission, the Falcon 9’s first stage booster shut down its engines and separated, allowing a single Merlin engine on the launcher’s second stage to fire into orbit.
Seconds later, the Falcon 9’s payload shroud jettisoned as the rocket soared into space, revealing the launcher’s more than 15.6-metric ton payload package, comprised of 60 flat-panel signal relay nodes for SpaceX’s Starlink network.
While the second stage accelerated into orbit, the first stage of the Falcon 9 descended back through the atmosphere and attempted landing on SpaceX’s football field-sized drone ship “Of Course I Still Love You” holding position nearly 630 km northeast of Cape Canaveral.
But the rocket missed the drone ship and appeared to make a soft landing in the water nearby, according to streaming video from the offshore vessel. The missed landing marked the first time a first stage booster on a Falcon 9 rocket has missed a landing attempt on a SpaceX drone ship since 2016.
The Falcon rocket used on Monday’s mission was a veteran of three previous launches and landings. It’s not likely to be reused after landing in sea water.
Two other SpaceX vessels were positioned in the Atlantic Ocean to try to catch the two halves of the Falcon 9’s payload shroud. SpaceX did not announce the results of the fairing recovery attempt, but a company employee said engineers are still experimenting with catching the aerodynamic shroud using fast-moving ships fitted with giant nets. Previous catch attempts have been hit or miss.
After firing thrusters to enter a controlled spin, the upper stage released retention rods holding the Starlink satellites to the rocket. That allowed the spacecraft to fly away from the Falcon 9 as the vehicles soared over the North Atlantic Ocean.
One change introduced Monday different from past Starlink missions was the release of the Starlink payloads into an elliptical transfer orbit, instead of a circular orbit.
“We are executing a direct inject of the Starlink satellites into an elliptical orbit,” said Jessica Anderson, a manufacturing engineer at SpaceX. “In prior Starlink missions, we deployed the satellites into a 290-kilometer circular orbit, which required two burns of the Merlin vacuum engine on the second stage.
“Keep in mind the stack of 60 Starlink satellites combined is one of the heaviest payloads we fly, so putting them directly into this orbit requires more vehicle performance and makes recovery more challenging,” she said. “Going forward, and starting with today, we will deploy the satellites shortly after the first burn of the second stage, putting the Starlink satellites into an elliptical orbit.
“Once checkouts are complete, the satellites will then use their on-board ion thrusters to move into their intended orbits at an operational altitude of 550 km.”
According to preflight predictions, the Starlink craft on Monday were programmed for deployment in an elliptical, or egg-shaped, orbit ranging between 212 and 386 kilometers in altitude, with an inclination of 53º to the equator.
As a result of the orbit change, the Falcon 9’s second stage remained in orbit after release the Starlink satellites Monday. It is expected to passively re-enter the atmosphere in the coming months, instead of performing a controlled de-orbit burn, as the stage did after previous Starlink launches.
Like SpaceX’s previous Starlink launches, the satellites deployed in a tight cluster. SpaceX ground teams will activate krypton ion thrusters and other systems on the satellites to maneuver them into a higher orbit, targeting an altitude of 341 miles (578 km) for operational service broadcasting signals in Ku-band.
The first phase of SpaceX’s Starlink program, which aims to beam consumer broadband to customers around the world, will include 1,584 of the flat-panel satellites — including spares — in orbit 578 km above Earth.
SpaceX has approval from the Federal Communications Commission to operate nearly 12,000 Starlink satellites in Ku-band, Ka-band and V-band frequencies, with groups of spacecraft flying at different altitudes with various orbital inclinations.
Launch 3: On January 29, 2020, SpaceX launched a Falcon 9 rocket carrying it's third batch of 60 Starlink satellites. The launch was at 9:06 a.m EST (14:06 GMT) Wednesday from Cape Canaveral Air Force Station, Fla. Two-and-a-half minutes after liftoff, the rocket’s first stage shut down its engines and dropped away from the Falcon 9’s second stage. Seconds later, the upper stage’s single Merlin engine — modified with an enlarged nozzle for better performance in space — ignited to accelerate the 60 Starlink satellites into orbit. 79)
The Falcon 9 jettisoned its clamshell-like payload fairing nearly three-and-a-half minutes into the mission.
Flying tail first, the rocket’s first stage booster reignited three of its nine engines to guide it toward SpaceX’s drone ship “Of Course I Still Love You” positioned around 630 km northeast of Cape Canaveral. A final landing burn using the center engine slowed the booster for a controlled vertical touchdown on the football field-sized barge, marking the 49th time SpaceX has recovered one of its rockets intact.
The booster flown Wednesday was making its third trip to space, following successful launches and landings in March 2019 and June 2019 on flights carrying SpaceX’s Crew Dragon spacecraft and Canada’s Radarsat Constellation Mission. With Wednesday’s mission, the booster has launched from all three of SpaceX’s active launch pads in Florida and California.
SpaceX said the rocket did its job placing the satellites into the proper orbit, and live video from the Falcon 9’s second stage showed the 60 flat-panel satellites separating from the launch vehicle as it flew south of Australia about one hour after liftoff from Cape Canaveral.
The Starlink satellites, built at a SpaceX facility in Redmond, Washington, filled the volume of the Falcon 9’s payload fairing. Each satellite has a mass of 260 kg, and the Starlink spacecraft stacked together form the heaviest payload SpaceX has ever launched.
With Wednesday’s launch, SpaceX has deployed 240 Starlink satellites on four dedicated missions since last May. That makes SpaceX the owner of the world’s largest fleet of commercial satellites.
Figure 33: A view of the 60 Starlink satellites stacked before Wednesday’s launch (image credit: SpaceX)
SpaceX says 24 launches are needed to provide global broadband service through the Starlink service. But the company could provide an interim level of service over parts of the Earth later this year, once SpaceX has launched around 720 satellites on 12 Falcon 9 flights.
Launch 2: On 7 January 2020 (02:19 UTC), SpaceX launched its third batch of 60 Starlink minisatellites (Starlink V1.0-L2) into orbit on a Falcon-9 Block 5 vehicle from Cape Canaveral SLC-40. 80)
- SpaceX wants to begin limited Internet service through the Starlink network later this year, then expand to global service to beam Internet signals to consumers in far-flung locales outside the reach of terrestrial wired broadband connections. Users on airplanes, ships and the U.S. military could also be Starlink customers.
- Blazing a similar trail to two previous Starlink satellite launches last year, a SpaceX Falcon 9 rocket lifted off from pad 40 at Cape Canaveral at 9:19:21 p.m. EST Monday (02:19:21 GMT on 7 January) and turned on a northeasterly heading over the Atlantic Ocean.
- Nine kerosene-fueled Merlin 1D engines on the base of the first stage powered the rocket off the launch pad with 1.7 million pounds of thrust.
- After two-and-a-half minutes, the nine main engines shut down and the first stage separated to begin descent maneuvers toward a landing on SpaceX’s drone ship “Of Course I Still Love You” in the Atlantic Ocean.
- The first stage — flying for the fourth time on Monday night’s mission — nailed its landing on the drone ship, marking the 48th time SpaceX has successfully landed a Falcon booster since the company’s first rocket recovery in 2015. An attempt to catch one half of the Falcon 9’s clamshell-like payload fairing in a net fastened to an ocean-going vessel was unsuccessful, SpaceX said.
- The Falcon 9’s second stage ignited its Merlin engine two times to place the 60 Starlink satellites into an orbit with a target altitude of 180 miles (290 kilometers) and an inclination of 53 degrees to the equator. SpaceX confirmed the Falcon 9 injected the payloads close to the planned orbit.
Figure 34: SpaceX’s Falcon 9 rocket streaks downrange to the northeast from Cape Canaveral Monday night with 60 Starlink satellites for the company’s planned global Internet network (image credit: SpaceX)
Launch 1: Sixty upgraded satellites for SpaceX’s Starlink broadband network (Starlink V1.0-L1) rocketed into orbit on Monday,11 November 2019 (14:56 UTC) from Florida’s Space Coast (SLC-40), debuting performance enhancements and notching new firsts in SpaceX’s list of rocket reuse accomplishments. 81)
- SpaceX’s second batch of Starlink satellites joined 60 previous broadband-beaming spacecraft in orbit after deployment from a Falcon 9 rocket, adding to a network that may eventually include thousands of satellites broadcasting high-speed Internet signals from space.
- The Falcon 9’s first stage shut down and detached from the rocket’s second stage around two-and-a-half minutes into the flight. Moments later, the Falcon 9’s second stage lit its single Merlin powerplant to propel itself into orbit with the Starlink payloads, then the rocket’s nose cone opened and fell away, revealing the Starlink satellites after transiting through the thick, lower layers of the atmosphere.
- The first stage booster returned to a propulsive landing on SpaceX’s drone ship “Of Course I Still Love You” holding position around 250 miles downrange from Cape Canaveral in the Atlantic Ocean, roughly due east of Charleston, South Carolina. The rocket completed its fourth mission, following three previous launches and landings — two last year, and one in February that helped loft into space an Indonesian communications satellite and the Israeli Beresheet moon lander.
- This launch was the first time SpaceX flew a Falcon 9 booster on a fourth mission. It also marked another first for SpaceX, which demonstrated its capability to reuse a payload fairing recovered from a previous launch.
- The bulbous payload shroud protects satellites during the first few minutes of flight, then drops away from the rocket in two halves. The fairing halves flown on 11 November originally launched on a Falcon Heavy mission April 11, then parachuted into the Atlantic Ocean, where SpaceX teams pulled them from the sea for inspections, refurbishment and reuse.
- Pursuing the prime objective of Monday’s mission, the Falcon 9’s second stage engine switched off about nine minutes after launch, and the rocket coasted over Europe and the Middle East before reigniting its engine at around 10:41 a.m. EST (15:41 GMT) to circularize its orbit. The Falcon 9 aimed for an altitude of around 174 miles (280 km) for deployment of the Starlink satellites, and a member of SpaceX’s launch team confirmed the rocket achieved an on-target orbit.
- The Falcon 9 sent commands at 10:56 a.m. EST (15:46 GMT) to release retention pins holding the Starlink satellites to the launcher, and live video from a camera on-board the rocket showed the 60 flat-panel spacecraft receding in the blackness of space.
Figure 35: Sixty Starlink satellites separated from the Falcon 9 rocket about one hour after launch Monday. The spacecraft deployed in one piece, then will disperse over the coming hours and days (image credit: SpaceX)
- The satellites, monitored at the SpaceX Control Center facility in Redmond, Washington, are designed to gradually disperse over the coming hours and days. Ion thrusters fed by krypton fuel will maneuver the satellites into their orbits at an altitude of 550 km with an inclination of 53º.
- SpaceX says 1,440 of the satellites are needed to provide Internet service over the “populated world,” a service level the company says could be achieved after 24 launches.
- The Starlink network could offer service for northern parts of the United States and Canada after six launches, according to SpaceX.
- SpaceX could launch thousands more Starlink satellites if merited by market demand. The Federal Communications Commission has authorized SpaceX to operate nearly 12,000 Starlink satellites broadcasting in Ku-band, Ka-band and V-band frequencies, with groups of spacecraft positioned at different altitudes and in various planes in low Earth orbit.
- The Starlink network is rapidly becoming a core business area for SpaceX, which is competing with companies like OneWeb and Amazon’s Project Kuiper to deploy fleets of thousands of small satellites in low Earth orbit to beam broadband Internet signals from space to users around the world.
- Developers of the so-called “mega-constellations” in low Earth orbit say their networks offer key advantages over traditional satellite Internet architectures, which relay on satellites in higher orbits, where radio transmissions — even traveling at the speed of light — take longer to reach.
Figure 36: Artist’s illustration of the distribution of satellites in SpaceX’s Starlink network (image credit: SpaceX)
- “Since the most recent launch of Starlink satellites in May, SpaceX has increased spectrum capacity for the end user through upgrades in design that maximize the use of both Ka- and Ku-bands,” SpaceX wrote in a press kit for Monday’s launch. “Additionally, components of each satellite are 100% demisable and will quickly burn up in Earth’s atmosphere at the end of their life cycle — a measure that exceeds all current safety standards.”
- SpaceX said the new Starlink spacecraft design can provide a 400 percent increase in data throughout per satellite, and each satellite carries double the number of steerable phased array broadband beams than on earlier Starlink platforms.
- Gwynne Shotwell, SpaceX’s president and chief operating officer, said last month that the company plans to begin launching Starlink spacecraft equipped with inter-satellite laser crosslinks some time mid-to-late next year.
- Three of the 60 satellites launched in May have stopped communicating with ground controllers, but SpaceX officials say they are pleased with the overall performance of the initial block of Starlink spacecraft.
- The U.S. Air Force is testing Internet connections between aircraft and SpaceX’s Starlink satellites to evaluate the network’s suitability for future military use, and Elon Musk, SpaceX’s founder and CEO, said he sent a tweet last month through a Starlink satellite.
- “We still have ways to go from tweets to 4K cat videos, but we are on our way,” joked Lauren Lyons, a SpaceX engineer who hosted the company’s webcast of Monday’s launch.
Launch : The first demonstation flight of SpaceX's Starlink satellite constellation launched on 24 May ,2019 (02:30 UTC) with the twice-flown Falcon-9 rocket from SLC-40 (Space Launch Complex-40) at Cape Canaveral Air Force Station, Florida. The Falcon vehicle contained a payload of 60 minisatellites, each with a mass of 227 kg. 82) 83)
Figure 37: Image of the first launch of SpaceX's Starlink satellite constellation on 24 May 2019 at 2:30 UTC (image credit: Satnews Daily)
Today’s launch is a major step towards the final goal of launching and operating 12,000 satellites in orbit to beam internet to the ground by the 2020s, reaching those who are not yet connected, with reliable and affordable broadband internet services. It’s estimated that 4 billion people in the world remain unconnected to the internet.
Eight minutes after the launch, the first stage of the rocket successfully landed on the drone ship Of Course I Still Love You (OCISLY) in the Atlantic Ocean. This was the third flight for the first stage booster, having flown on the Telstar 18 VANTAGE mission in September 2018, and the Iridium-8 mission in January 2019.
An hour later, the Falcon-9 rocket began to release the satellites at an altitude of 450 km. The satellites then had to separate and use their thrusters to take up their positions in a relatively low orbit of 550 km. 84)
"Successful deployment of 60 Starlink satellites confirmed!", the company said on its official Twitter account.
• March 26, 2022: Intelsat is buying Starlink terminals and services and reselling them as part of a multi-layer, multi-orbit managed network. 85)
- If you can’t beat them, join them. That is the thinking behind a new managed network service offered by satellite operator Intelsat that integrates geostationary satellites, SpaceX’s Starlink low Earth orbit constellation and cellular broadband.
- “A lot of our customers would like to use Starlink and many have been using it,” Don Claussen, Intelsat’s vice president of business development, told SpaceNews at last week’s Satellite 2022 conference.
- Satellite communications companies “spend so much time fighting each other over what orbits are better, what band is better,” he said. “If we’re really listening to our customers, what they are saying is ‘we kind of need all of you.’”
- Intelsat is buying Starlink terminals and services and reselling them as part of a multi-layer, multi-orbit managed network that includes geostationary satcom and LTE connectivity. “We combine them in one gateway so the user has one interface,” said Claussen.
- “We’re still working with OneWeb but they’re just not as far along as Starlink,” Claussen said. “And our government users have been testing Starlink terminals. So we already see that demand is there.”
- Intelsat operates 52 geostationary satellites. Starting this month, users of the company’s Flex satcom service can opt for a bundle with the Starlink service and cellular. “Our government customers can get the whole package and just pay one bill,” said Claussen. Starlink has more than 2,000 operational satellites in orbit.
- A key target customer for the service is the Defense Department, he said. Military units could bring the entire network to the field in two large suitcases, he said. One would have a Satcube geostationary terminal, cables and a gateway. The other would have the Starlink terminal and cables, and they would all plug into the gateway.
- The Starlink setup is relatively easy, said Claussen. “I actually had my daughter do it a couple of weeks ago at my house.”
- Starlink has been “great to work with,” he added. “And the feedback that we got from customers about it is that it makes sense. Now the government and the industry have to come together to figure out how we get this in the hands of users.”
Figure 38: Intelsat deployed a mobile network in Haiti after an earthquake destroyed the country’s terrestrial communication network (image credit: Intelsat)
• February 9, 2022: Up to 80% of the Starlink satellites launched by SpaceX last week (on Feb. 3) will soon reenter, or have already done so, because a geomagnetic storm kept the spacecraft from raising their orbits. 86)
- SpaceX said late Feb. 8 that the 49 satellites it launched Feb. 3 were affected by a geomagnetic storm the next day. Such storms, triggered by solar activity like coronal mass ejections, can increase the density of the upper atmosphere, including at the initial low orbit SpaceX uses to check out Starlink satellite before raising them to their higher operational orbits. 87)
- “Onboard GPS suggests the escalation speed and severity of the storm caused atmospheric drag to increase up to 50 percent higher than during previous launches,” the company said. “The Starlink team commanded the satellites into a safe-mode where they would fly edge-on (like a sheet of paper) to minimize drag—to effectively ‘take cover from the storm’—and continued to work closely with the Space Force’s 18th Space Control Squadron and LeoLabs to provide updates on the satellites based on ground radars.”
- Exacerbating the problem is the low orbit used by SpaceX for deployment of Starlink satellites, with a perigee of only 210 kilometers. The company says it intentionally uses the low orbit so that any spacecraft that fails initial tests after reaching orbit will quickly deorbit naturally.
- That safe mode, though, kept the satellites from raising their orbits using their onboard electric propulsion, and was also not enough to counteract the increased atmospheric drag. “Preliminary analysis shows the increased drag at the low altitudes prevented the satellites from leaving safe-mode to begin orbit raising maneuvers, and up to 40 of the satellites will reenter or already have reentered the Earth’s atmosphere,” SpaceX stated.
- While SpaceX emphasized the severe nature of the storm, forecasts before the launch, and data collected during it, indicated only a minor storm. NOAA’s Space Weather Prediction Center said Feb. 2 it expected a moderate geomagnetic storm, rated G2 on a scale of G1 to G5, that day, going down to G1 on Feb. 3, the day of the launch. The Space Force’s Space Launch Delta 45 predicted only a low risk from space weather in the last forecast it issued before the launch. Other satellite operators have not reported issues with their spacecraft, but were not in SpaceX’s unique position of having satellites in very low orbits.
- The incident could be a precursor for more space weather problems in the future as the sun moves into a more active phase of its 11-year cycle. Solar events have occasionally in the past caused problems for individual satellites, such as damaging or disabling electronics.
- This solar cycle, though, will take place amid a boom in the deployment of small satellites in low Earth orbit, many of which do not use customized and expensive radiation-hardened electronics. In a presentation at the SmallSat Symposium here Feb. 8, Carissa Christensen, founder and chief executive of Bryce Space and Technology, said the number of active satellites has grown from about 1,000 five years ago to more than 5,000 today. “That’s a big leap,” she said.
Figure 39: A Falcon 9 lifted off from the Kennedy Space Center Feb. 3 carrying 49 Starlink satellites. Up to 40 of those satellites will reenter after a geomagnetic storm kept the spacecraft from raising their orbits (image credit: SpaceX)
• January 17, 2022: Since 2019, SpaceX has been launching an increasing number of internet satellites into orbit around Earth. The satellite constellation, called Starlink, now includes nearly 1,800 members orbiting at altitudes of about 550 kilometers. Astronomers have expressed concerns that that these objects, which can appear as streaks in telescope images, could hamper their scientific observations. 88)
- To quantify these effects, a team of researchers studied archival images captured by the National Science Foundation (NSF)-funded Zwicky Transient Facility (ZTF), an instrument that operates from Caltech's Palomar Observatory near San Diego. ZTF scans the entire night sky every two days, cataloguing cosmic objects that explode, blink, or otherwise change over time. This includes everything from supernovae to near-Earth asteroids. The Zwicky team members say they decided to specifically study the effects of Starlink satellites because they currently represent the largest low-Earth orbit, or LEO, constellation, and they have well-characterized orbits.
- The findings, reported in the January 17 issue of The Astrophysical Journal Letters, shows 5,301 satellite streaks appear in archival images taken between November 2019 and September 2021. 89) — The streaks are most apparent in so-called twilight observations, those taken at dawn or dusk, which are important for finding near-Earth asteroids that appear close to the sun in the sky. ZTF has discovered several asteroids of this nature, including 2020 AV2, the first asteroid spotted with an orbit that fits entirely within the orbit of Venus.
- "In 2019, 0.5 percent of twilight images were affected, and now almost 20 percent are affected," says Przemek Mróz, study lead author and a former Caltech postdoctoral scholar who is now at the University of Warsaw in Poland.
- In the future, the scientists expect that nearly all of the ZTF images taken during twilight will contain at least one streak, especially after the Starlink constellation reaches 10,000 satellites, a goal SpaceX hopes to reach by 2027.
- "We don't expect Starlink satellites to affect non-twilight images, but if the satellite constellation of other companies goes into higher orbits, this could cause problems for non-twilight observations," Mróz says.
- Yet despite the increase in image streaks, the new report notes that ZTF science operations have not been strongly affected. Study co-author Tom Prince, the Ira S. Bowen Professor of Physics, Emeritus, at Caltech, says the paper shows a single streak affects less than one-tenth of a percent of the pixels in a ZTF image.
- "There is a small chance that we would miss an asteroid or another event hidden behind a satellite streak, but compared to the impact of weather, such as a cloudy sky, these are rather small effects for ZTF."
- Prince says that software can be developed to help mitigate potential problems; for example, software could predict the locations of the Starlink satellites and thus help astronomers avoid scheduling an observation when one might be in the field of view. Software can also assess whether a passing satellite may have affected an astronomical observation, which would allow astronomers to mask or otherwise reduce the negative effects of the streaks.
- The new study also looked at the effectiveness of visors on the Starlink satellites, which SpaceX added beginning in 2020 to block sunlight from reaching the spacecraft. According to the ZTF observations, the visors reduce the satellite brightness by a factor of about five. That dims the satellites down to an apparent brightness level of 6.8 magnitude (the brightest stars are first magnitude, and the faintest stars we can see with our eyes are about sixth magnitude).
- This is still not dim enough to meet standards outlined by the Satellite Constellations 1 (SATCON1) workshop in 2020, a gathering sponsored by the NOIRLab (National Optical-Infrared Astronomy Research Laboratory) and the AAS (American Astronomical Society) to bring together astronomers, policymakers, and other experts to discuss the impact of large satellite constellations on astronomy and society. The group called for all LEO satellites to be at seventh magnitude or fainter.
- The study authors also note their study is specific to ZTF. Like ZTF, the upcoming Vera C. Rubin Observatory, under construction in Chile, will also survey the sky nightly, but due to its more sensitive imager, astronomers predict that it may be more negatively affected by satellite streaks than ZTF.
- ZTF (Zwicky Transient Facility) is funded by NSF and an international collaboration of partners. Additional support comes from the Heising-Simons Foundation and Caltech. ZTF data are processed and archived by Caltech's IPAC astronomy center. NASA supports ZTF's search for near-Earth objects through the Near-Earth Object Observations program.
• September 16, 2021: Two years after the close approach of a Starlink satellite with a European Space Agency satellite alarmed some in the space industry, SpaceX says it’s working closely with a wide range of satellite operators to ensure safe space operations. 90)
Figure 41: SpaceX says it's working closely with a number of government and commercial satellite operators to coordinate close approaches involving Starlink satellites with their spacecraft (image credit: SpaceX)
- In September 2019, ESA announced it maneuvered an Earth science satellite called Aeolus when the agency determined it would pass dangerously close to a Starlink satellite. The incident was exacerbated by a breakdown in communication between ESA and SpaceX in the days leading up to the close approach.
- After that incident “we went to work coordinating” with both commercial and government satellite operators, said David Goldstein, principal guidance navigation and control engineer at SpaceX, during a panel discussion at the AMOS (Advanced Maui Optical and Space Surveillance Technologies Conference) here Sept. 16 (AMOS 14-17, September 2021, Wailea, Maui, Hawai'i).
- The best-known example of that coordination is a Space Act Agreement between NASA and SpaceX announced in March. Under the terms of that agreement, SpaceX agreed to move its Starlink satellites in the event of any close approaches with NASA spacecraft, a move intended to avoid scenarios when both parties maneuvered their satellites.
- In addition to that agreement, Goldstein said the company has a Cooperative Research and Development Agreement with the U.S. Space Force and a “good working relationship” with ESA and the European Union’s Space Surveillance and Tracking program.
- Those partnerships extend even to OneWeb, a company that complained in Federal Communications Commission filings about a close approach one of its newly launched satellites had with a Starlink satellite in March. “We have a great working relationship with OneWeb after that conjunction in March,” Goldstein said. “Just fantastic coordination at the operational level.”
- He specifically praised OneWeb for its support for the ongoing Inspiration4 crewed mission, saying “they jumped through a lot of hoops” to provide updated information about the orbits of its satellites. Goldstein appeared by video on the panel from SpaceX’s headquarters because, he said, he is providing collision avoidance support for Inspiration4, which launched Sept. 15 for what’s scheduled to be a three-day mission.
- SpaceX recently signed a contract with LeoLabs, which provides commercial space traffic management services using data from a network of tracking radars it operates. “They’re doing great work, and we’re super proud of the accomplishments they’ve had and the help they’re providing to us and others,” he said.
- Goldstein also expressed interest in Slingshot Beacon, a collaboration platform developed by Slingshot Aerospace to help satellite operators share space traffic information. That tool, he said, could make it easier for companies to share data and coordinate potential conjunctions.
- One of the more controversial aspects of Starlink is its automated collision avoidance system, where the satellites maneuver 12 hours before the time of closest approach if the risk of a collision exceeds a set threshold.
- Goldstein said he did not have up-to-date information on the number of such maneuvers the Starlink fleet has performed to date. However, he said the company informed the FCC that, from December 2020 through May 2021, Starlink satellites made more than 2,000 collision avoidance maneuvers.
- “The average per satellite during that time is one to two,” he said. “That’s not a terribly high number for that many spacecraft.” SpaceX currently has nearly 1,700 Starlink satellites in orbit.
- Goldstein appeared on a panel that was discussing developing “right of way” procedures for determining who should maneuver in the event of a close approach. “We need a sense of urgency to address things that we can do to avoid the Kessler Syndrome,” or a runaway growth of orbital debris. “There are things that we can do to make space safer, and we all need a sense of urgency to do what we can to avoid that.”
• May 13, 2021: SpaceX will install ground stations within Google’s data centers for its Starlink broadband satellites under a new cloud partnership. 91)
- The alliance aims to expand the reach of Google Cloud customers to their data, services and applications without the need for nearby cell towers.
- After connecting to a Starlink constellation that is becoming increasingly available worldwide, they can increase performance by running applications within Google data centers.
- SpaceX president and chief operating officer Gwynne Shotwell said that, in return, Starlink customers will leverage Google’s infrastructure and capabilities for secure connections.
- Urs Hölzle, senior vice president of infrastructure at Google Cloud, said in a statement: “Applications and services running in the cloud can be transformative for organizations, whether they’re operating in a highly networked or remote environment.
- “We are delighted to partner with SpaceX to ensure that organizations with distributed footprints have seamless, secure, and fast access to the critical applications and services they need to keep their teams up and running.”
- They expect to provide enterprise customers with new services based on this partnership in the second half of this year.
- Although there are currently more than 1,550 Starlinks in orbit following SpaceX’s latest launch May 9, the company remains in beta testing.
Figure 42: A row of servers inside Google's data center in Douglas County, Georgia (image credit: Google)
Battle in the clouds
- Starlink’s Google partnership appears to be more integrated than an alliance announced in October with Microsoft, which will also use the satellites to expand cloud services.
- Microsoft said Starlink will support its new space-focused, modular cloud business called Azure Space, which will offer mobile cloud computing data centers that can be deployed anywhere in the world.
- O3b internet satellites that SES operates in medium Earth orbit (MEO) also empower that initiative, supporting customers who use space-based data but are unwilling to invest in ground infrastructure directly to process and analyze it.
- SES is jointly investing with Microsoft in Azure Orbital ground stations and MEO gateways, primarily targeting the Earth observation market.
- The Luxembourg-based company became the first satellite operator in 2019 to implement ONAP, an open-source platform telecoms companies use to automate their networks, with network functions virtualization (NFV) technology on Azure cloud services.
- Cloud computing companies and satellite operators are increasingly coming together to drive down costs and improve network access amid improving virtualization technologies.
- In September, Microsoft unveiled a “ground-station as a service” business called Azure Orbital to compete with AWS Ground Station, which is part of Amazon’s cloud-computing branch Amazon Web Services (AWS).
- Although Project Kuiper has yet to launch a single satellite, Amazon has set aside $10 billion to accelerate its development.
- In 2018, established LEO satellite operator Iridium Communications partnered with AWS to develop a network called CloudConnect, targeting the market for connecting internet of things (IoT) devices to the internet.
- Established broadband operators with satellites in geostationary orbit (GEO) have also been ramping up their cloud partnerships in recent years.
- Intelsat, Inmarsat and Viasat, for example, are working with Microsoft as an ‘ExpressRoute’ partner, helping send customer data to the Azure network of fiber-linked data centers.
• March 8, 2021: SpaceX is seeking regulatory permission to connect moving vehicles to its rapidly expanding Starlink constellation, branching the broadband network out of fixed homes and offices. 92)
- The company is asking the FCC (Federal Communications Commission) for authorization similar to the blanket license it already has for up to a million end-user customer Earth stations.
- David Goldman, SpaceX’s director of satellite policy, said in a regulatory filing that its Earth Stations in Motion (ESIM) equipment is “electrically identical to its previously authorized consumer user terminals but have mountings that allow them to be installed on vehicles, vessels and aircraft, which are suitable for those environments.”
- SpaceX recently told the FCC it has more than 10,000 Starlink users in the United States and abroad, after launching more than 1,100 high-speed internet satellites.
- The possibility of diversifying into more markets will raise eyebrows in the satellite mobility industry, as Elon Musk’s launch company continues to raise sizable funding rounds to back its capital-intensive plans.
- Satellite operators Inmarsat, SES and Intelsat are among those likely to feel the most disruption in the land-mobile market, Northern Sky Research principal analyst Brad Grady said.
- Depending on the exact form factors and use cases, Grady said mobile-satellites service (MSS) businesses at Inmarsat and Iridium Communications might see disruption akin to when maritime products transitioned to VSATs (Very-Small-Aperture Terminals).
- However, antenna maker Kymeta and other players in the communications on the pause (COTP) market segment are likely to feel more of an impact from early Starlink adoption.
- “Right now, there really isn’t a high-bandwidth/low latency form factor solution for that market segment that would match the terminal form factor of Starlink,” Grady said.
- “Perhaps once [SES’ next-generation constellation] mPower and their terminal segment develops in the next couple of years we’ll see another competitor there, but the COTP market is a far easier nut to crack in my view.”
- Almost all other non-GEO high-throughput satellite (HTS) constellations have been diversifying into other markets, and Grady said investors and industry have already “priced-in” Starlink as a competitive threat, potential partner or solution as they prepare for its eventual entrance.
- Starlink is likely eying opportunities at Tesla, Musk’s electric vehicle and energy company, which makes cars that currently rely on terrestrial telecoms companies for connectivity.
- Last year, SpaceX sought FCC permission to test Starlink services on private jets, as well as the vessels its rockets land on for reuse.
Figure 43: Starlink's $499 self-install starter kit includes a phased array antenna that industry veterans say likely costs SpaceX $1,000 or more to manufacture (image credit: SpaceX)
• February 19, 2021: To realize his dream of satellite-powered internet, tech billionaire Elon Musk needs to install antennas around the world. In northern France, a village hopes he'll decide to keep those antennas far away. 93)
- Saint-Senier-de-Beuvron, population 350, is none too thrilled to have been picked as a ground station for Musk's Starlink project for broadband from space.
- "This project is totally new. We don't have any idea of the impact of these signals," said Noemie Brault, a 34-year-old deputy mayor of the village just 20 km (12 miles) from the majestic Mont Saint-Michel abbey on the English Channel.
- "As a precaution the municipal council said no," she explained.
- Musk, founder of SpaceX and electric carmaker Tesla, plans to deploy thousands of satellites to provide fast internet for remote areas anywhere in the world.
- It's a high-stakes battle he is waging with fellow billionaire Jeff Bezos of Amazon as well as the London-based start-up OneWeb.
- Antennas on the ground will capture the signals and relay them to individual user terminals connected by cable.
- Starlink's contractor had already secured French regulatory approval to install nine "radomes" — three-meter-tall globes protecting the antennas — in Saint-Senier, one of four sites planned for France.
- But the refusal was based on a technicality, and the contractor, Sipartech, told AFP (Agence France Presse) that it plans to refile its request, which the council will likely be unable to block.
- "That worries us because we have no data" on the eventual effects of the signals on the health of humans or animals, said Brault, herself a farmer.
- "And when you hear that he wants to implant a chip in people's brains, it's frightening," she said, referring to Musk's Neuralink project.
- 'Not technophobes'
- Francois Dufour, a Greens council member and retired farmer, said he believes residents had reason to worry.
- "The risks from electromagnetic waves is something we've already seen with high-voltage power lines, which have disturbed lots of farmers in the area," he said.
- Besides, "social networks, internet, they exist already — why do we need to go look for internet on the moon?" he said.
- France's national radio frequency agency ANFR, which approved Starlink's stations, says they present no risks to residents, not least because they will be emitting straight up into the sky.
- There are already around 100 similar sites across France dating from the first satellite launches from 50 years ago, it adds.
- That hasn't convinced Jean-Marc Belloir, 57, who worries that his cows will start producing less milk.
- "On our farm, we're always online. My cows are linked up; my smart watch warns me when they're going to calve," Belloir said. "But when you see the range of these antennas, there has to be some research" on the potential impacts.
- Still, he baptized his latest calf "SpaceX du Beuvron," combining Musk's firm with the name of the creek that runs through his village.
- "We're not attacking Elon Musk," said Anne-Marie Falguieres, who lives just 60 meters from the future Starlink station with her husband and two children.
- "We're not technophobes. I'm a guide on the bay, I have an internet site, my husband works from home. But these antennas are completely new, at least in France, and we want to know if they're dangerous or not," she said.
- She also thinks the project is hardly necessary and unlikely to interest many, based on reports from the US.
- "In the testing phase, they made you pay $500 for the dish and then you had to pay $100 a month for a subscription," she said. "I don't think everyone's going to be able to pay that."
• February 4, 2021: SpaceX disclosed in a public filing on Thursday that its Starlink satellite internet service now has “over 10,000 users in the United States and abroad.” 94)
- “Starlink’s performance is not theoretical or experimental ... [and] is rapidly accelerating in real time as part of its public beta program,” SpaceX wrote in a filing with the Federal Communications Commission.
- Elon Musk’s company began a public beta program of Starlink in October, with service priced at $99 a month, in addition to a $499 upfront cost to order the Starlink Kit, which includes a user terminal and Wi-Fi router to connect to the satellites.
- The company is offering the service to select customers in the northern U.S., Canada, and the U.K.
- Starlink is SpaceX’s ambitious project to build an interconnected internet network with thousands of satellites, known in the space industry as a constellation, designed to deliver high-speed internet to consumers anywhere on the planet. The FCC two years ago approved SpaceX to launch 11,943 satellites, with the company aiming to deploy 4,425 satellites in orbit by 2024.
- SpaceX noted in the filing that Starlink’s service is “meeting and exceeding 100/20 Mbit/s throughput to individual users,” while the vast majority of users were seeing latency “at or below 31 milliseconds.”
- The update on Starlink’s customer base came in a petition to the FCC, with SpaceX asking that Starlink be designated an “Eligible Telecommunications Carrier” or ETC.
- The company noted that receiving this designation is necessary for Starlink to provide service to regions in “Alabama, Connecticut, New Hampshire, New York, Tennessee, Virginia and West Virginia.”
- SpaceX was awarded access to those regions under the FCC’s Rural Digital Opportunities Fund, an auction to bring broadband services to rural areas.
- “Designating Starlink Services as an ETC is in the public interest because it will enable the company to receive support that will facilitate rapid deployment of broadband and voice service to the Service Areas at speeds and latency comparable to terrestrial systems in urban locations,” SpaceX wrote in the filing on Thursday.
- “Starlink Services respectfully requests that the Commission grant this petition by June 7, 2021 in order for Starlink Services to meet the Commission’s deadline for ETC designation for the purposes of receiving RDOF support.”
Figure 44: A Starlink user terminal installed on the roof of a building in Canada (image credit: SpaceX)
- SpaceX’s rapid Starlink user growth is notable given the service has been in a public beta for just over three months.
- But customer demand was apparent before Starlink began offering early access, as SpaceX said in July that it received interest in the service from “nearly 700,000 individuals” across the United States. Those individuals’ interest came within the first two months of SpaceX allowing potential customers to sign up on the company’s website for updates on service availability.
• January 18, 2021: The German Astronomical Society (AG), the German association of amateur astronomers (VdS) and the Society of German-Speaking Planetariums (GDP) comment on the rapid increase in the number of satellites in the night sky. Artificial satellites have significant impact on the perception of the natural starry sky and the exploration of our universe. 95)
- Astronomical research institutes, observatories and planetariums have received a large number of concerned inquiries in recent months. The reason for this is the many satellites launched into Earth orbit by the private US space company SpaceX since May 2019, which are moving across the sky in groups.
- With Starlink, SpaceX hopes to provide a satellite-based network of high-speed internet connections worldwide. The final constellation will consist of more than 30,000 satellites, which far exceeds the number of all satellites in Earth orbit to date. Other companies such as OneWeb, Amazon and others are planning or in some cases already enacting similar projects. German companies also have corresponding plans to launch large numbers of microsatellites cheaply into Earth orbits. Astronomy is aware of the importance of connecting remote regions of the Earth to the internet, as well as other technological developments. Nevertheless, implementation via the enormous increase in artificial satellites in the sky also entails considerable restrictions and risks, the consequences of which must be weighed responsibly and reduced as far as possible.
- This will forever change the night sky, the sight of which has fascinated and inspired mankind since the beginning. In addition, the exploration of the universe for professional and amateur astronomy will be significantly affected. Images of night landscapes and celestial objects, which have always carried the fascination of astronomy to the general public and contributed to general education, will be significantly affected. Astronomy forms the basis for our exploration and use of space. With the development of sophisticated observatories, many advances have been made in the exploration of our universe. Modern telescopes scan the sky and peer into the depths of space, furthering our understanding of the universe. However, these observations are significantly threatened by the multitude of satellites. Of particular note are studies of the dynamic universe. Optical telescopes for wide-field imaging will be impacted (such as the future Vera C. Rubin Observatory), as well as the tracking and monitoring of small bodies in the solar system that could potentially collide with Earth. In addition to optical astronomy, observations in infrared and radio wavebands from space will also be significantly affected.
- Radio astronomy is already increasingly disturbed by man-made signals, for example by the steadily growing volume of mobile communications. Therefore, scientists set up their observatories in very remote areas. However, the expected large number of satellites will operate around the globe so there will be no escape for radio astronomy either. German researchers do not only operate Europe’s largest radiotelescope, the 100-m telescope at Effelsberg near Bonn, but they are also involved in a large number of state-of-the-art radio observatories around the world, such as the Atacama Large Millimeter Array (ALMA) and the Square Kilometer Array (SKA) under construction in Australia and South Africa. These sites will then also be affected.
- The current development also poses a threat to manned and unmanned space flight, as it inevitably increases the risk of collisions.
- The degradation of the night sky has a global impact, but the approval of satellite launches is done exclusively by national authorities, such as the Federal Communications Commission in the US. We hereby express our concern about this and call for international regulations for satellite constellations to ensure the protection of the night sky over the entire electromagnetic spectrum for research and as a human cultural asset.
• January 9, 2021: The FCC (Federal Communications Commission) will allow SpaceX to launch 10 Starlink satellites into polar orbit on an upcoming mission, but deferred a decision on a much broader modification of SpaceX’s license. 96)
- In an order published Jan. 8, the FCC granted SpaceX permission to launch 10 Starlink satellites into a 560-kilometer orbit with an inclination of 97.6 degrees. Those satellites will launch on a Falcon 9 no earlier than Jan. 14 as part of Transporter-1, a dedicated smallsat rideshare mission.
- SpaceX had been lobbying the FCC for weeks for permission to launch Starlink satellites into a polar orbital plane as the FCC considers a modification of the company’s license to lower the orbits of satellites originally authorized for higher altitudes. That included a Nov. 17 request to launch 58 satellites into a single polar orbital plane, citing “an opportunity for a polar launch in December” that it did not identify.
- In a Jan. 5 filing with the FCC, SpaceX said it spoke with FCC officials the previous day about this request. “SpaceX confirmed that if it receives the proper authorization, its forthcoming Transporter-1 mission will include 10 Starlink satellites targeted for operation in polar orbits,” the company stated.
- SpaceX argued in filings that adding at least some satellites into polar orbits would allow it to begin service in Alaska, which is not in the coverage area of existing Starlink satellites launched into mid-inclination orbits. The company said in its November filing that “launching to polar orbits will enable SpaceX to bring the same high-quality broadband service to the most remote areas of Alaska that other Americans have come to depend upon, especially as the pandemic limits opportunities for in-person contact.”
- Other satellite operators opposed the move. In a Nov. 19 filing, Viasat said that “commercial expediency” was not a sufficient reason for the FCC to grant SpaceX permission for launching satellites into polar orbit, raising concerns about the reliability of Starlink satellites and the orbital debris hazards they pose.
- It rejected Viasat’s opposition to the request, stating that allowing the 10 satellites “does not present concerns in connection with the issues raised by commenters.” That included orbital debris concerns about failed Starlink satellites. “We conclude that the addition of these ten satellites is unlikely to have any significant incremental effect on the operations of other satellites in the relevant orbital altitudes,” the order stated.
- The FCC, though, deferred a decision on SpaceX’s overall license modification request to lower the orbits of those satellites. In the order, the FCC didn’t state when it expected to rule on the full request.
• December 8, 2020: Observations conducted by the Murikabushi Telescope of Ishigakijima Astronomical Observatory in Japan confirmed that dark coating can reduce satellite reflectivity by half. There are concerns that numerous artificial satellites in orbit could impair astronomical observations, but these findings may help alleviate such conditions. 97) 98)
- Today's growing demand for space-based services has spawned a wave of satellite constellation projects which operate numerous artificial satellites in orbit. Since these satellites can shine by reflecting sunlight, the astronomy community has raised concerns about their potential impact on astronomical observations. In January 2020, SpaceX launched "DarkSat," an experimental satellite with an anti-reflective coating, and asked astronomers to assess how much this coating can reduce the satellite reflectivity. Brightness measurements of artificial satellites have already been conducted, but until now, there was no verification that a dark coating actually achieves the expected reflectivity reduction.
- The Murikabushi Telescope of Ishigakijima Astronomical Observatory can observe celestial objects simultaneously in three different wavelengths (colors). Comparing multicolor data obtained under the same conditions provides more accurate insight into how much the coating can reduce the satellite brightness. Observations conducted from April to June 2020 revealed for the first time in the world that artificial satellites, whether coated or not, are more visible at longer wavelengths, and that the black coating can halve the level of surface reflectivity of satellites. Such surface treatment is expected to reduce the negative impacts on astronomical observations. Further measures will continue to be implemented to pave the way for peaceful coexistence between space industries and astronomy.
• December 7, 2020: The Federal Communications Commission (FCC) on Monday awarded SpaceX's Starlink Internet venture $885 million in a broadband services auction for rural America. It was the fourth-largest award in recent competitive bidding. 99)
- The win provides new funding to Starlink, which recently provided free public testing in limited areas of the northwestern United States and Canada. The money also will help Starlink move toward bringing better-quality and faster Internet service to rural areas.
- Elon Musk's company has more than 900 Starlink communications satellites in orbit and intends to launch hundreds more.
- SpaceX won bids to provide broadband in 35 states, more states than any of the 180 companies that bid in the recent auction, which covered 49 states.
- The contracts are a significant win for SpaceX, said Shagun Sachdeva, who has worked as an analyst covering large satellite constellations and recently founded her own consulting company, France-based Kosmic Apple.
- "If SpaceX manages to get government and military contracts for Starlink, as they seem to be successfully doing so far, they can keep the commercial costs low enough to gain a decent market share," Sachdeva said.
- The FCC funding and recent public testing mean SpaceX is "most definitely one of the front runners now" in providing broadband service, she said.
- The companies that won more funding than SpaceX were LTD Broadband, which operates in the Upper Midwest, at $1.32 billion; Connecticut-based Charter Communications, $1.22 billion; and Rural Electric Cooperation Consortium, a nationwide collection of rural utilities, at $1.1 billion.
- SpaceX Starlink satellites operate at LEO (Low Earth Orbit) altitudes of roughly 550 km according to SpaceX.
- Winning bids in the auction allows SpaceX to submit formal applications for contract Internet service in rural areas. SpaceX has advertised Starlink at $99 a month after the purchase of a satellite dish receiver for $499, but the FCC funding is to be used partly to lower those costs for rural areas.
• August 26, 2020: Light pollution problem from large satellite constellations for astronomy
- For more than a year, astronomers have expressed concern that constellations of thousands of satellites could interfere with their observations. The satellites, visible through reflected sunlight, can leave bright streaks as they pass through the fields of view of telescopes.
- The workshop concluded that while there are a number of ways to reduce the problem, there is no panacea. “No combination of mitigations will eliminate the impact of satellite constellations on optical astronomy,” said Connie Walker of NOIRLab, one of the co-chairs of the workshop, in an Aug. 25 press conference. The exception, she said, was not to launch such systems at all, but acknowledged “it’s not viable for industry.”
- Instead, the report offered a set of recommendations to mitigate the effects of megaconstellations on astronomy, including ways for companies to reduce the brightness of their satellites and the amount of time they are visible in the night sky. Those steps include placing satellites in orbits no higher than 600 kilometers, as well as darkening them and controlling their attitude to reduce their reflectivity.
- Even before the SATCON1 workshop, astronomers had been working with SpaceX on mitigation measures along the lines of those steps described in the report. The Starlink satellites operate at an altitude of 550 kilometers, and the company has tested measures to both darken the satellites to reduce their reflectivity as well as to install visors to block sunlight from hitting reflective surfaces.
- The first “VisorSat” satellite launched in June and, earlier this month, reached its operational orbit. Astronomers said it was still too soon to measure its effectiveness. “We don’t have a complete set of observations yet,” said Lori Allen of NOIRLab, who chaired a SATCON1 working group on observations. “We do have some initial observations, but those are still under analysis.”
- Allen said that the effort to measure the brightness of VisorSat had been affected by observatories that remain closed because of the pandemic. However, some amateur satellite observers have observed the first VisorSat this month and estimate its brightness at seventh magnitude, enough of a reduction to reduce the worst impacts on astronomy.
- The efforts to reduce the brightness of Starlink satellites are much further along than those of other satellite constellations, such as OneWeb and Amazon’s Project Kuiper. OneWeb, which paused the deployment of its constellation after filing for Chapter 11 bankruptcy in March, worries astronomers because its satellites are in orbits 1,200 kilometers high, making them visible longer each night. The company also recently filed a proposal to operate as many as 48,000 additional satellites.
- “SpaceX is leading the charge in terms of trying to understand these issues and designing mitigations on their satellites,” said Tony Tyson, chief scientist of the Vera Rubin Observatory and chair of a SATCON1 working group devoted to mitigation measures.
- “Others are getting interested,” he added, notably OneWeb and Amazon, which participated in the workshop, “but we’re nowhere near any kind of down-to-earth engineering discussions on how to do this.”
- The report included recommendations for astronomers as well, such as development of software to plan observations to avoid or minimize the number of satellites passing through the field of view, as well as software to identify and remove trails created by passing satellites. It also recommended astronomers and satellite operators work together to coordinate observations of satellites to measure changes in brightness over time, and to share more accurate satellite position data to enable astronomers to more effectively avoid satellites.
- “We need to greatly increase the precision of publicly available positions” of satellites, said Jeff Hall of Lowell Observatory, the other co-chair of the SATCON1 workshop. “They’re not accurate enough for observatories to work around some of the issues that we’re facing.”
- The report did not examine regulatory or policy issues involving satellite megaconstellations and astronomy. That will be the subject of a second workshop tentatively scheduled for the first half of 2021.
- The SATCON1 workshop is not the only study of the topic. The NSF commissioned a report from the independent JASON scientific advisory group on the effects megaconstellations have on astronomy in general. Ralph Gaume, director of the NSF’s astronomical sciences division, said at an Aug. 25 meeting of the Astro2020 decadal survey steering committee that he received an initial “letter report” from the group a week ago, and expected the final report around October 1.
- Phil Puxley, vice president for special projects at the Association of Universities for Research in Astronomy, which operates NOIRLab for the NSF, noted at the SATCON1 briefing that astronomers previously built observatories in remote locations to avoid terrestrial light pollution. But with constellations, he said, “there are no remote locations that are immune. There is no place to hide.”
• May 15, 2020: Every two weeks, late in the evening, people are able to see a swarm of strikingly bright points of light crossing the night sky. An array of images and spectacular videos of such sightings circulate on social media. Word soon gets around that these glowing strings of light are not, in fact, an alien fleet. Rather, they are the Starlink satellites from SpaceX, the US space company run by Elon Musk, streaking across the night sky in 'trains'. 102)
- This visual spectacle and the ambitious project behind it, which is on an enormous scale, are fascinating. Felix Huber and Manfred Gaida explain the background to the project in an interview. They talk about the impact that these strings of light have on astronomy and space, and answer the questions that people sent to DLR when it put out a call on social media.
- Felix Huber is Director of DLR Space Operations and Astronaut Training. This is the central institution for spaceflight operations in Germany. Manfred Gaida is an astronomer and researcher at the DLR Space Administration and an expert on satellite-based space research and optical astronomy.
Figure 45: Eye-catching newcomers to the sky (image credit: Giancarlo Foto4U CC-BY 2.0)
• April 27, 2020: SpaceX Chief Executive Elon Musk said April 27 that he hopes to test a new way to reduce the brightness of the company’s Starlink satellites on the next launch for the broadband megaconstellation. 103)
- In a briefing to a committee working on the next astrophysics decadal survey, Musk said the experimental “VisorSat,” along with a new approach for orienting Starlink satellites as they raise their orbits, should address concerns raised by astronomers that the Starlink constellation could interfere with their observations.
- “Our objectives, generally, are to make the satellites invisible to the naked eye within a week, and to minimize the impact on astronomy, especially so that we do not saturate observatory detectors and inhibit discoveries,” Musk said.
- While DarkSat has shown some promise, appearing about one magnitude darker than untreated Starlink satellites, the company is moving in a different direction. “We found an option that is even better than that, which is basically to give the satellites shades,” he said.
- Musk and others at SpaceX have previously discussed a sunshade that they compared to a patio umbrella that would deploy from a satellite, keeping the antennas in shadow. Musk, at the committee meeting, described a concept called VisorSat that would deploy panels, like sun visors mounted on a car windshield, to block the sun.
- “We have a radio-transparent foam that will deploy nearly upon the satellite being released, and it blocks the sun from reaching the antennas,” he said. “They’re sun visors, essentially: they flip out and block the sun and prevent reflections.” He predicted that the visors would have a “massive effect” on the brightness of the satellites.
- SpaceX is planning test VisorSat on the company’s next Starlink launch. “It’s a bit of a challenge, but that’s our goal,” he said. He didn’t say how many satellites would be equipped with visors, or when the launch was scheduled. SpaceX has been performing Starlink launches at the rate of at least one a month so far this year, most recently April 22.
- A second effort involves the brightness of the satellites as they raise their orbits after launch. Musk said the satellites appear bright because of the orientation of the solar panels, which are aligned differently during orbit raising than once at their operational orbit.
- As soon as this week, Musk said SpaceX will try an “orientation roll” to change the alignment of the solar panels relative to the Earth, reducing the amount of sunlight they reflect to the ground. “Early indications are this will have a significant effect on the brightness during orbit raise,” he said. “The satellites will be significantly less visible from the ground.”
- The measures SpaceX has taken have come after months of discussions with astronomers, who have been worried about the effects a full constellation of Starlink satellites — about 12,000 according to current plans, with proposals for up to 30,000 more — would have on astronomy. The situation was of particular concern to those operating telescopes with wide fields of view, like the Vera Rubin Observatory under construction in Chile, where Starlink satellites would be visible in a large fraction of images taken each night.
- In a separate presentation to the committee earlier in the day, Tony Tyson, chief scientist for the Rubin Observatory, said the concern was that the brightness of unmodified Starlink satellites would cause “nonlinear crosstalk,” or severe image artifacts, in the observatory’s camera. “We would be left with all of these fake trails, fake galaxies, etc., in our data, damaging the science,” he said.
- SpaceX has already made progress darkening the satellites, with newer satellites about one magnitude darker than the original “v0.9” satellites launched in May 2019 even without the darkening treatments used on DarkSat. If the satellites can be made about a factor of two darker than DarkSat, Tyson said a technique to correct for the nonlinear crosstalk can work, although it is computer intensive and won’t correct for the original streak left in the images by passing satellites.
- The new approaches won’t address the issue of brightness of existing Starlink satellites, but Musk said their lifetime is limited. He estimated the initial generation of satellites will be deorbited in about three to four years to make way for improved satellites. “We’ll just have far greater throughput capability with version two” of the Starlink satellites, he said.
- While the focus of the committee presentation and subsequent discussion, which lasted for more than an hour, was on Starlink, there was some talk about the role SpaceX could play in supporting space-based astronomy, which is not affected by Starlink or other megaconstellations.
- “I’m very excited about the future of space-based telescopes that could be very large,” he said. He mentioned Starship, the company’s next-generation large reusable launch system, which will begin regular flights “I think within a couple of years,” he promised. “It allows for space telescopes to be transported to orbit at probably an order of magnitude lower cost than in the past.”
- “I’m pretty interested in trying to figure out how to help launch and possibly build a big observatory in space,” he said, offering to meet with astronomers to discuss mission concepts. “Like a planet imager or something like that.”
• March 19, 2020: SpaceX, the largest commercial satellite constellation operator in the world, has ambitious plans of installing 12,000 satellites in low-orbit over a span of several years, as part of its Starlink project to provide low-cost broadband internet service. 104)
A well-known astronomer and satellite tracker has voiced concerns that efforts to scan the skies for potentially dangerous near-Earth asteroids might be in jeopardy due to ambitious plans by SpaceX to deploy over 12,000 satellites in low-Earth orbit over the next several years.
The study "The Low Earth Orbit Satellite Population and Impacts of the SpaceX Starlink" by Jonathan McDowell from the Harvard-Smithsonian Center for Astrophysics analyses the impact that the broadband service mega-constellation could have on different observatories. 105)
"Astronomers - and casual viewers of the night sky - must expect a future in which the low Earth orbit population includes tens of thousands of relatively large satellites."
The researcher has modelled how many satellites in a constellation of 12,000 that the FCC has already approved for SpaceX would be lit up by the Sun and above the horizon from three different latitudes on Earth.
"We see that several hundred satellites are above the horizon at all times of night; during winter twilight, and all summer night long, most of them are illuminated," writes McDowell.
Since Elon Musk's SpaceX began launching batches of satellites in 2019, astronomers have been voicing concerns that the expanding number of huge satellite constellations, driven by Starlink's target plan of installing up to 42,000 satellites in low orbit could wreak havoc on scientific observations of space.
Both skywatchers and astronomers were shocked by the bright lights of the satellites that were obstructing the view for major telescopes and potentially corrupting between 30 to 40 percent of astronomical images.
Satellites from companies other than SpaceX, such as OneWeb pose a similar problem, as many observatories with particularly wide fields of view, like the Vera C. Rubin Observatory currently under construction in Chile, are likely to be impacted.
According to a recent study from the European Southern Observatory (ESO), satellite mega-constellations are projected as "severely" affecting between 30 and 50 percent of observations taken by the Rubin Observatory.
"However, there appear to be other science projects which may be more severely affected... For example, searches for near-Earth asteroids include observations taken in twilight, a time when the satellites are illuminated year-round," writes McDowell.
The astronomer has recently been expounding the importance of continued, unhampered observation of asteroids that may pose a danger to the Earth due to the close proximity in which they move.
When it comes to detection of near-Earth objects travelling close to the Sun, researchers typically search for them after sunset, when Starlink's satellites illuminate the sky.
While urging additional regulation, which he claimed might help solve the issue, he stressed measures being proposed at the moment are not effective.
There has been no official comment from SpaceX.
Previously, to allay concerns, SpaceX CEO Elon Musk stated the company would work with astronomers to develop solutions to mitigate any impact on scientific observation. In response to the criticism, Elon Musk tweeted in May 2019 that the amount of light the satellites have been sending down toward Earth would be studied and measures to mitigate the effects would be taken by modifying them to be less reflective.
"Agreed, sent a note to Starlink team last week specifically regarding albedo reduction. We'll get a better sense of value of this when satellites have raised orbits and arrays are tracking to Sun."
Meanwhile, the company continues to launch new batches of satellites, as a Falcon 9 rocket is geared up to carry 60 more satellites to space on 18 March.
SpaceX has plans to have over 1,500 satellites in space by the end of the year, with the long-term plan for the mega-constellation aiming at 42,000 satellites that would beam high-speed internet to every corner of the globe.
• March 5, 2020: Astronomers
have recently raised concerns about the impact of satellite
mega-constellations on scientific research. To better understand the
effect these constellations could have on astronomical observations,
ESO commissioned a scientific study of their impact, focusing on
observations with ESO telescopes in the visible and infrared but also
considering other observatories. The study, which considers a total of
18 representative satellite constellations under development by SpaceX,
Amazon, OneWeb and others, together amounting to over 26 thousand
satellites , has now been accepted for publication in Astronomy
& Astrophysics. 106) 107)
The study also finds that the greatest impact could be on wide-field surveys, in particular those done with large telescopes. For example, up to 30% to 50% of exposures with the US National Science Foundation's Vera C. Rubin Observatory (not an ESO facility) would be "severely affected”, depending on the time of year, the time of night, and the simplifying assumptions of the study. Mitigation techniques that could be applied on ESO telescopes would not work for this observatory although other strategies are being actively explored. Further studies are required to fully understand the scientific implications of this loss of observational data and complexities in their analysis. Wide-field survey telescopes like the Rubin Observatory can scan large parts of the sky quickly, making them crucial to spot short-lived phenomena like supernovae or potentially dangerous asteroids. Because of their unique capability to generate very large data sets and to find observation targets for many other observatories, astronomy communities and funding agencies in Europe and elsewhere have ranked wide-field survey telescopes as a top priority for future developments in astronomy.
Professional and amateur astronomers
alike have also raised concerns about how satellite mega-constellations
could impact the pristine views of the night sky. The study shows that
about 1600 satellites from the constellations will be above the horizon
of an observatory at mid-latitude, most of which will be low in the sky
— within 30 degrees of the horizon. Above this — the part
of the sky where most astronomical observations take place —
there will be about 250 constellation satellites at any given time.
While they are all illuminated by the Sun at sunset and sunrise, more
and more get into the shadow of the Earth toward the middle of the
night. The ESO study assumes a brightness for all of these satellites.
With this assumption, up to about 100 satellites could be bright enough
to be visible with the naked eye during twilight hours, about 10 of
which would be higher than 30 degrees of elevation. All these numbers
plummet as the night gets darker and the satellites fall into the
shadow of the Earth. Overall, these new satellite constellations would
about double the number of satellites visible in the night sky to the
naked eye above 30 degrees .
These numbers do not include the trains of satellites visible immediately after launch. Whilst spectacular and bright, they are short lived and visible only briefly after sunset or before sunrise, and — at any given time — only from a very limited area on Earth.
The ESO study uses simplifications and assumptions to obtain conservative estimates of the effects, which may be smaller in reality than calculated in the paper. More sophisticated modelling will be necessary to more precisely quantify the actual impacts. While the focus is on ESO telescopes, the results apply to similar non-ESO telescopes that also operate in the visible and infrared, with similar instrumentation and science cases.
Satellite constellations will also have an impact on radio, millimeter and submillimeter observatories, including the Atacama Large Millimeter/submillimeter Array (ALMA) and the Atacama Pathfinder Experiment (APEX). This impact will be considered in further studies.
ESO, together with other observatories, the International Astronomical Union (IAU), the American Astronomical Society (AAS), the UK Royal Astronomical Society (RAS), and other societies, is taking measures to raise the awareness of this issue in global fora such as the United Nations Committee on the Peaceful Uses of Outer Space (COPUOS) and the European Committee on Radio Astronomy Frequencies (CRAF). This is being done while exploring with the space companies practical solutions that can safeguard the large-scale investments made in cutting-edge ground-based astronomy facilities. ESO supports the development of regulatory frameworks that will ultimately ensure the harmonious coexistence of highly promising technological advancements in low Earth orbit with the conditions that enable humankind to continue its observation and understanding of the Universe.
• June 14, 2019: SpaceX’s ambitious Starlink project could eventually launch more than 10,000 satellites into orbit and rewrite the future of the internet. But Elon Musk’s company SpaceX has been taking heat from the astronomical community after an initial launch in late May released the first 60 satellites. The satellites with a mass of 227 kg were clearly visible in Earth’s night sky, inspiring concern that they could increase light pollution, interfere with radio signals, and contribute to the growing issue of space debris. 108)
This week, the American Astronomical Society, the International Astronomical Union, the British Royal Astronomical Society, and the International Dark-Sky Association (IDA) all issued statements expressing concern about Starlink’s potential to damage astronomical research by leaving bright streaks through images.
“The Starlink affair has raised the attention of the astronomy community in a way that I’ve not seen during my couple of decades in it,” says John Barentine, director of public policy at the IDA, which lobbies against light pollution. “I hope that this moment is the wake-up call that is needed to prompt a new discussion in the international community about the nature of outer space, especially near the Earth, in a commercial context.”
Musk had repeatedly assured people on Twitter that his satellites wouldn’t be visible at night, so the light caught some people by surprise. However, the satellites’ initial brightness is intended to wane as they climb higher into their permanent orbits.
“The observability of the Starlink satellites is dramatically reduced as they raise orbit to greater distance and orient themselves with the phased array antennas toward Earth and their solar arrays behind the body of the satellite,” a spokesperson for SpaceX said in an email.
Figure 47: Telescopes at Lowell Observatory in Arizona captured this image of galaxies on May 25, their images marred by the reflected light from more than 25 Starlink satellites as they passed overhead (image credit: Victoria Girgis/Lowell Observatory)
But Barentine and other astronomers aren’t so sure, especially given that this is only the beginning for Starlink. Plus, many other companies — including Amazon, Boeing, OneWeb, Telesat, LeoSat, and even Facebook — are planning other so-called “mega-constellations” for connecting the masses online.
“There are billions of people around the world who lack access to broadband internet,” a spokesperson for Amazon’s Project Kuiper said in an email. “Our vision is to provide low-latency, high-speed broadband connectivity to many of these unserved and underserved communities around the world .... Many of our satellite and mission design decisions are, and will continue to be, driven by our goals of ensuring space safety and taking into account concerns about light pollution.”
But there are already 22,000 artificial objects currently in orbit. And as the microlaunch space race kicks into high gear, that number is destined to double. Communications satellites aren’t the only things headed up, either. One group even proposed launching orbiting billboards that would shine ads back down to Earth. And an artist recently launched the “Humanity Star” – a purely artistic light beacon.
“Space is already crowded, and roughly doubling the number of objects in low- and near-Earth orbit will only add to the visual pollution of the night sky,” Barentine says. “Being in a dark place and seeing one satellite fly over every few minutes is one thing. But seeing literally dozens of them at any given time for hours every night is another story entirely.”
Part of the reason this problem stands to get worse, according to astrophysicist Laura Forczyk, is “there is no regulatory body in the United States that directs companies as to the kind of light pollution or the brightness of satellites. This is a fairly new topic and as always the government regulations are behind technology.”
But Forczyk, owner of the space consulting firm Astralytical, also says that changing the night skies isn’t the same thing as losing the night sky — and it’s a little too early to know what the total impact is going to be. After all, the Starlink satellites still haven’t reached their final orbit. “We’re very reactive when it comes to these kinds of things,” she says, but emphasizes miscommunication from both sides.
Whether the problem stands to worsen or not, most experts see the growth of these mega-constellations as inevitable.
“We can change the surface of the spacecraft so it is more absorptive and less reflective or we can even make it more transparent,” Metzger says. “We do have the ability to make electrical conductors completely transparent so we don’t need metal. You could have glass with transparent conductors in the glass ... I think we’ll probably be doing all of these things in the future.”
• January 9, 2020: The aerospace company SpaceX launched 60 of its Starlink broadband Internet satellites into orbit on 6 January 2020 — including one, called DarkSat, that is partially painted black. The probe is testing one strategy to reduce the brightness of satellite ‘megaconstellations’, which scientists fear could interfere with astronomical observations. 109)
Various companies plan to launch thousands of Internet satellites in the coming years; SpaceX, of Hawthorne, California, aims to launch 24 batches of Starlinks this year. By the mid-2020s, thousands to tens of thousands of new satellites could be soaring overhead. Bright streaks caused by light reflecting off them could degrade astronomical images.
“I was complaining to my wife that I can’t sleep very well these days because of this,” says Tony Tyson, a physicist at the University of California, Davis, and chief scientist of the Vera C. Rubin Observatory, a major US telescope under construction in Chile. (It was renamed this week from the Large Synoptic Survey Telescope to honor the late Rubin, who discovered evidence for the existence of dark matter.)
Astronomers discussed the potential impacts of the satellites on various telescopes, and what could be done about them, on 8 January at a meeting of the American Astronomical Society in Honolulu, Hawaii. “2020 is the window to figure out what makes a difference in reducing the impact,” says Jeffrey Hall, director of Lowell Observatory in Flagstaff, Arizona, and chair of the society’s committee on light pollution.
“SpaceX is absolutely committed to finding a way forward so our Starlink project doesn’t impede the value of the research you all are undertaking,” Patricia Cooper, SpaceX’s vice-president for satellite government affairs, told a session at the astronomy meeting.
Star light, star bright: Three batches of Starlinks have been launched, for a total of about 180 satellites so far. They are most obvious in the night sky immediately after launch, before they boost their orbits to higher altitudes where they are farther away and appear dimmer. It’s not yet clear how significant a problem Starlinks will be for astronomy; scientists have complained about trails in their images since the first launch, but if the company ultimately moves to paint most of the Starlinks black, the impact could be substantially reduced.
Many astronomers panicked in June, soon after SpaceX launched the first batch of 60 Starlinks and telescopes began photographing their trails. Their brightness came as a surprise, says Patrick Seitzer, an astronomer at the University of Michigan in Ann Arbor. “The new megaconstellations coming online have the potential to be brighter than 99% of everything else in Earth orbit, and that’s where the concern comes from,” he says.
Several factors contribute to their puzzling brightness, astronomers reported at the meeting. SpaceX says the position of the solar panels might have something to do with it: at lower elevations, before the orbit boost, the satellites’ panels are positioned like an open book to reduce drag. That temporary orientation could make them reflect more sunlight. The speed at which a satellite moves across a telescope’s field of view is also important — the slower it moves, the more brightness accumulates per pixel of imagery.
There are no regulations that control how bright or dim a satellite needs to be, notes Ralph Gaume, director of the astronomical-sciences division of the US National Science Foundation in Alexandria, Virginia.
Twilight zone: Calculations suggest the Starlink trails will interfere with astronomy most significantly during the hours surrounding twilight and dawn. That’s a particular problem for observations that need to be made during twilight, such as searches for some near-Earth asteroids. And on short summer nights, the satellite trails could be visible all night long.
The Rubin Observatory is particularly vulnerable because it will scan huge amounts of the sky very frequently. When it begins operating in 2022, it will photograph the entire night sky every three days, for ten years.
If telescope operators know precisely where each satellite will appear and at what time, they can swivel the telescope to point at a different part of the sky that does not have a satellite in it, says Tyson. That’s feasible if there are 1,000 satellites, but not if there are tens of thousands, because the telescope loses so much time maneuvering that “it’s hopeless”, he says.
That leaves darkening as a leading option. With DarkSat, SpaceX engineers painted surfaces on the satellite that scatter light or reflect light diffusely, says Cooper. That could make them faint enough to be invisible to anyone looking up at a typical night sky — but almost certainly still visible to most astronomical research telescopes.
“It’s still going to be very much a part of astronomers’ lives,” says Jonathan McDowell, an astronomer at the Harvard–Smithsonian Center for Astrophysics in Cambridge, Massachusetts. “Just not a part of everyone’s lives.”
1) Matt Williams, ”SpaceX’s Starlink Constellation Construction Begins. 2,200 Satellites Will go up Over the Next 5 years,” Universe Today, 16 April 2019, URL: https://www.universetoday.com/141980/spacexs-starlink-constellation-construction-begins-2200-satellites-will-go-up-over-the-next-5-years/
4) Jason Rainbow,”‘Mounting evidence’ shows need for Starlink Gen 2 environmental review, says Viasat,” SpaceNews, 2 May 2022, URL: https://spacenews.com/mounting-evidence-shows-need-for-starlink-gen-2-environmental-review-says-viasat/
5) Andy Lawrence, Meredith L. Rawls, Moriba Jah, Aaron Boley, Federico Di Vruno, Simon Garrington, Michael Kramer, Samantha Lawler, James Lowenthal, Jonathan McDowell & Mark McCaughrean, ”The case for space environmentalism,” Nature Astronomy, Volume 6, pp: 428-435, Published: 22 April 2022, https://doi.org/10.1038/s41550-022-01655-6, URL: https://www.nature.com/articles/s41550-022-01655-6.pdf
6) Jason Rainbow, ”Starlink signs first inflight Wi-Fi deal for services later this year,” SpaceNews, 22 April 2022, URL: https://spacenews.com/starlink-signs-first-inflight-wi-fi-deal-for-services-later-this-year/
7) Jason Rainbow, ”Starlink loses French spectrum license,” SpaceNews, 7 April 2022, URL: https://spacenews.com/starlink-loses-french-spectrum-license/
8) Jeff Foust, ”NASA outlines concerns about Starlink next-generation constellation in FCC letter,” SpaceNews, 9 February 2022, URL: https://spacenews.com/nasa-outlines-concerns-about-starlink-next-generation-constellation-in-fcc-letter/
9) Jason Rainbow, ”Pakistan is next to halt Starlink preorders,” SpaceNews, 19 January 2022, URL: https://spacenews.com/pakistan-is-next-to-halt-starlink-preorders/
10) Jason Rainbow, ”Starlink’s head of India resigns as SpaceX refunds preorders,” SpaceNews, 4 January 2021, URL: https://spacenews.com/starlinks-head-of-india-resigns-as-spacex-refunds-preorders/
11) Jason Rainbow, ”India orders halt on Starlink presales until it gives regulatory approval,” Space News, 29 November 2021, URL: https://spacenews.com/india-orders-halt-on-starlink-presales-until-it-gives-regulatory-approval/
12) Jason Rainbow, ”All future Starlink satellites will have laser crosslinks,” SpaceNews, 26 August 2021, URL: https://spacenews.com/all-future-starlink-satellites-will-have-laser-crosslinks/
13) Jason Rainbow, ”Viasat wants FCC to review Starlink’s government funding,” SpaceNews, 1 June 2021, URL: https://spacenews.com/viasat-wants-fcc-to-review-starlinks-government-funding/
14) Jeff Foust, ”FCC approves Starlink license modification,” SpaceNews, 27 April 2021, URL: https://spacenews.com/fcc-approves-starlink-license-modification/
15) Jeff Foust, ”SpaceX adds to latest funding round,” SpaceNews, 15 April 2021, URL: https://spacenews.com/spacex-adds-to-latest-funding-round/
16) J. D. Harrington, ”NASA, SpaceX Sign Joint Spaceflight Safety Agreement,” NASA Commercial Space, Press Release 21-011, 18 March 2021, URL: https://www.nasa.gov/press-release/nasa-spacex-sign-joint-spaceflight-safety-agreement
17) ”SpaceX launches public beta test of Starlink Internet service,” Space Daily, 27 October 2020, URL: https://www.spacedaily.com/reports/SpaceX_launches_public_beta_test_of_Starlink_Internet_service_999.html
18) ”SpaceX, Microsoft partner in global satellite Internet project,” Space Daily, 21 October 2020, URL: https://www.spacedaily.com/reports/SpaceX_Microsoft_partner_in_global_satellite_Internet_project_999.html
20) Stephen Clark, ”SpaceX’s brisk Starlink launch cadence to continue next week,” Spaceflight Now, 14 January 2020, URL: https://spaceflightnow.com/2020/01/14/spacexs-brisk-starlink-launch-cadence-to-continue-next-week/
21) Jeff Foust, ”SpaceX, astronomers working to address brightness of Starlink satellites,” Space News, 8 January 2020, URL: https://spacenews.com/spacex-astronomers-working-to-address-brightness-of-starlink-satellites/
22) ”SpaceX seeking many more satellites for space-based internet grid,” Space Daily, 16 October 2019, URL: http://www.spacedaily.com/reports/SpaceX_seeking_many_more_satellites_for_space-based_internet_grid_999.html
23) Eric Ralph, ”SpaceX CEO Elon Musk reveals radical Starlink redesign for 60-satellite launch,” Tesla Rati, 11 May 2019, URL: https://www.teslarati.com/spacex-starlink-satellites-tease-revolutionary-design/
24) Stephen Clark, ”FCC approves SpaceX’s plan to operate Starlink satellites at lower altitude,” Spaceflight Now, 30 April 2019, URL: https://spaceflightnow.com/2019/04/30/fcc-approves-spacexs-plan-to-operate-starlink-satellites-at-lower-altitude/
25) Eric Ralph, ”SpaceX’s first dedicated Starlink launch announced as mass production begins,” Tesla Rati, 8 April 2019, URL: https://www.teslarati.com/spacex-starlink-first-launch-date/
26) ”SpaceX gets nod to put 12,000 satellites in orbit,” Phys.org, 16 November 2018, URL: https://phys.org/news/2018-11-spacex-satellites-orbit.html
27) ”SpaceX Receives FCC's Stamp of Approval to Launch 4,425 Broadband Satellites,” Satnews Daily, 2 April 2018, URL: http://www.satnews.com/story.php?number=1759391214
28) Jon Brodkin, ”FCC approves SpaceX plan to launch 4,425 broadband satellites,” ars Technica, 30 March 2018, URL: https://arstechnica.com/information-technology/2018/03/spacex-gets-fcc-approval-to-build-worldwide-satellite-broadband-network/
29) ”SpaceX launches Falcon 9 with PAZ, Starlink demo and new fairing,” NASA Spaceflight.com, 22 February 2018, URL: https://www.nasaspaceflight.com/2018/02/spacex-falcon-9-paz-launch-starlink-demo-new-fairing/
30) Stephen Clark, ”More Starlink satellites ride into orbit on predawn launch of Falcon 9 rocket,” Spaceflight Now, 6 May 2022, URL: https://spaceflightnow.com/2022/05/06/more-starlink-satellites-ride-into-orbit-on-predawn-launch-of-falcon-9-rocket/
31) Jeff Foust, ”Falcon 9 busier than ever as Starship reviews delayed again,” SpaceNews, 01 May 2022, URL: https://spacenews.com/falcon-9-busier-than-ever-as-starship-reviews-delayed-again/
32) Alejandro Alcantarilla, ”SpaceX launch cadence moves forward with 53 more Starlink satellites to orbit,” NASA Spaceflight.com, 21 April 2022, URL: https://www.nasaspaceflight.com/2022/04/starlink-4-14-launch/
33) Stephen Clark, ”Live coverage: SpaceX launches Falcon 9 fleet-leader with more Starlink satellites,” Spaceflight Now, 19 March 2022, URL: https://spaceflightnow.com/2022/03/18/falcon-9-starlink-4-12-live-coverage/
34) Stephen Clark, ”Live coverage: SpaceX launches another Starlink mission,” Spaceflight Now, 9 March 2022, URL: https://spaceflightnow.com/2022/03/09/falcon-9-starlink-4-10-live-coverage/
36) Stephen Clark, ”After another Starlink mission, SpaceX on pace for one launch per week this year,” Spaceflight Now, 3 March 2022, URL: https://spaceflightnow.com/2022/03/03/after-another-starlink-mission-spacex-on-pace-for-one-launch-per-week-this-year/
37) Jeff Foust, ”SpaceX makes its case for space sustainability with latest Starlink launch,” SpaceNews, 25 February 2022, URL: https://spacenews.com/spacex-makes-its-case-for-space-sustainability-with-latest-starlink-launch/
38) Jeff Foust, ”SpaceX launches Starlink satellites to higher orbit,” SpaceNews, 21 February 2022, URL: https://spacenews.com/spacex-launches-starlink-satellites-to-higher-orbit/
39) Jason Rainbow, ”SpaceX launches latest Starlink batch ahead of premium service plan,” SpaceNews, 3 February 2022, URL: https://spacenews.com/spacex-launches-latest-starlink-batch-ahead-of-premium-service-plan/
40) Jeff Foust, ”SpaceX passes 2,000 Starlink satellites launched,” SpaceNews, 18 January 2022, URL: https://spacenews.com/spacex-passes-2000-starlink-satellites-launched/
41) Jeff Foust, ”SpaceX kicks off 2022 with Starlink launch,” SpaceNews, 6 January 2022, URL: https://spacenews.com/spacex-kicks-off-2022-with-starlink-launch/
42) Jeff Foust, ”Falcon 9 sets reuse milestone with Starlink launch,” SpaceNews, 18 December 2021, URL: https://spacenews.com/falcon-9-sets-reuse-milestone-with-starlink-launch/
43) Jason Rainbow, ”SpaceX breaks annual launch record as it deploys 48 more Starlink satellites,” SpaceNews, 02 December 2021, URL: https://spacenews.com/spacex-breaks-annual-launch-record-as-it-deploys-48-more-starlink-satellites/
44) Stephen Clark, ”SpaceX launch starts deployment of new Starlink orbital shell,” Spaceflight Now, 13 November 2021, URL: https://spaceflightnow.com/2021/11/13/spacex-launch-starts-deployment-of-new-starlink-orbital-shell/
45) Jeff Foust, ”SpaceX launches first dedicated polar Starlink mission,” SpaceNews, 14 September 2021, URL: https://spacenews.com/spacex-launches-first-dedicated-polar-starlink-mission/
46) Stephen Clark, ”New version of SpaceX’s Starlink internet satellites to begin launching Monday,” Spaceflight Now, 13 September 2021, URL: https://spaceflightnow.com/2021/09/13/new-version-of-spacexs-starlink-internet-satellites-to-begin-launching-monday/
47) Jeff Foust, ”SpaceX sets Falcon 9 fairing reuse mark with Starlink launch,” SpaceNews, 26 May 2021, URL: https://spacenews.com/spacex-sets-falcon-9-fairing-reuse-mark-with-starlink-launch/
49) Jeff Foust, ”SpaceX launches Starlink satellites and rideshare payloads,” SpaceNews, 15 May 2021, URL: https://spacenews.com/spacex-launches-starlink-satellites-and-rideshare-payloads/
51) Jeff Foust, ”SpaceX sets booster reuse milestone on Starlink launch,” SpaceNews, 9 May 2021, URL: https://spacenews.com/spacex-sets-booster-reuse-milestone-on-starlink-launch/
52) Jeff Foust, ”SpaceX continues Starlink deployment with latest launch,” SpaceNews, 4 May 2021, URL: https://spacenews.com/spacex-continues-starlink-deployment-with-latest-launch/
53) Jeff Foust, ”SpaceX launches Starlink satellites,” SpaceNews, 29 April 2021, URL: https://spacenews.com/spacex-launches-starlink-satellites/
54) Jeff Foust, ”SpaceX launches another set of Starlink satellites as it nears global coverage,” SpaceNews, 7 April 2021, URL: https://spacenews.com/spacex-launches-another-set-of-starlink-satellites-as-it-nears-global-coverage/
55) Jeff Foust, ”SpaceX marks anniversary of first launch with Starlink mission,” SpaceNews, 24 March 2021, URL: https://spacenews.com/spacex-marks-anniversary-of-first-launch-with-starlink-mission/
56) Jeff Foust, ”SpaceX sets new booster reuse mark with Starlink launch,” SpaceNews, 14 March 2021, URL: https://spacenews.com/spacex-sets-new-booster-reuse-mark-with-starlink-launch/
57) Jeff Foust, ”SpaceX launches Starlink satellites and expands international service,” SpaceNews, 11 March 2021, URL: https://spacenews.com/spacex-launches-starlink-satellites-and-expands-international-service/
58) Stephen Clark, ”SpaceX sticks 75th Falcon rocket landing after launching 60 more Starlink satellites,” Spaceflight Now, 4 March 2021, URL: https://spaceflightnow.com/2021/03/04/spacex-sticks-75th-falcon-rocket-landing-after-launching-60-more-starlink-satellites/
59) Jeff Foust, ”SpaceX launches Starlink satellites, but booster landing fails,” SpaceNews, 16 February 2021, URL: https://spacenews.com/spacex-launches-starlink-satellites-but-booster-landing-fails/
60) Jeff Foust, ”Falcon 9 launches Starlink satellites,” SpaceNews, 4 February 2021, URL: https://spacenews.com/falcon-9-launches-starlink-satellites/
61) Stephen Clark, ”SpaceX smashes record with launch of 143 small satellites,” Spaceflight Now, 24 January 2021, URL: https://spaceflightnow.com/2021/01/24/spacex-launches-record-setting-rideshare-mission-with-143-small-satellites/
62) Jeff Foust, ”SpaceX surpasses 1,000-satellite mark in latest Starlink launch,” SpaceNews, 20 January 2021, URL: https://spacenews.com/spacex-surpasses-1000-satellite-mark-in-latest-starlink-launch/
63) Stephen Clark, ”SpaceX sets new rocket reuse records with successful Starlink launch,” Spaceflight Now, 20 January 2021, URL: https://spaceflightnow.com/2021/01/20/spacex-sets-new-rocket-reuse-records-with-successful-starlink-launch/
64) Stephen Clark, ”SpaceX launches 60 more Starlink satellites on 100th Falcon 9 flight,” Spaceflight Now, 25 November 2020, URL: https://spaceflightnow.com/2020/11/25/spacex-launches-60-more-starlink-satellites-on-100th-falcon-9-flight/
65) Stephen Clark, ”SpaceX adds another 60 satellites to Starlink network,” Spaceflight Now, 24 October 2020, URL: https://spaceflightnow.com/2020/10/24/spacex-adds-another-60-satellites-to-starlink-network/
66) Stephen Clark, ”SpaceX launches another batch of Starlink satellites,” Spaceflight Now, 18 October 2020, URL: https://spaceflightnow.com/2020/10/18/spacex-launches-another-batch-of-starlink-satellites/
67) Jeff Foust, ”Falcon 9 investigation ongoing as SpaceX continues Starlink launches,” SpaceNews, 18 October 2020, URL: https://spacenews.com/falcon-9-investigation-ongoing-as-spacex-continues-starlink-launches/
68) Stephen Clark, ”SpaceX breaks cycle of scrubs with successful Falcon 9 launch,” Spaceflight Now, 6 October 2020, URL: https://spaceflightnow.com/2020/10/06/spacex-breaks-cycle-of-scrubs-with-successful-falcon-9-launch/
69) Stephen Clark, ”SpaceX launches more Starlink satellites, beta testing well underway,” Spaceflight Now, 3 September 2020, URL: https://spaceflightnow.com/2020/09/03/spacex-launches-more-starlink-satellites-beta-testing-well-underway/
70) Stephen Clark, ”SpaceX adds more satellites to ever-growing Starlink network,” Spaceflight Now, 18 August 2020, URL: https://spaceflightnow.com/2020/08/18/spacex-adds-more-satellites-to-ever-growing-starlink-network/
71) Stephen Clark, ”SpaceX closes out busy week with launch of more Starlink satellites,” Spaceflight Now, 7 August 2020, URL: https://spaceflightnow.com/2020/08/07/spacex-closes-out-busy-week-with-launch-of-more-starlink-satellites/
72) ”SpaceX launched 10th Starlink batch,” Space Daily, 07 August 2020, URL: https://www.spacedaily.com/reports/SpaceX_launched_10th_Starlink_batch_999.html
73) Caleb Herny, ”SpaceX launches 58 Starlink satellites, three Planet SkySats on Falcon 9,” SpaceNews, 13 June 2020, URL: https://spacenews.com/spacex-launches-58-starlink-satellites-three-planet-skysats-on-falcon-9/
74) ”SpaceX sets new mark in rocket reuse 10 years after first Falcon 9 launch,” Spaceflight Now, 4 June 2020, URL: https://spaceflightnow.com/2020/06/04/spacex-sets-new-mark-in-rocket-reuse-10-years-after-first-falcon-9-launch/
75) ”SpaceX launch boosts Starlink network to 480 satellites,” Space Daily, 4 June 2020, URL: https://www.spacedaily.com/reports/SpaceX_launch_boosts_Starlink_network_to_480_satellites_999.html
77) Stephen Clark, ”Falcon 9 rocket overcomes engine failure to deploy Starlink satellites,” Spaceflight Now, 18 March 2020, URL: https://spaceflightnow.com/2020/03/18/falcon-9-rocket-overcomes-engine-failure-to-deploy-starlink-satellites/
78) Stephen Clark, ”SpaceX delivers more Starlink satellites to orbit, booster misses drone ship landing,” Spaceflight Now, 17 February 2020, URL: https://spaceflightnow.com/2020/02/17/spacex-delivers-more-starlink-satellites-to-orbit-booster-misses-drone-ship-landing/
79) Stephen Clark, ”SpaceX boosts 60 more Starlink satellites into orbit after weather delays,” Spaceflight Now, 29 January 2020, URL: https://spaceflightnow.com/2020/01/29/spacex-boosts-60-more-starlink-satellites-into-orbit-after-weather-delays/
80) Stephen Clark, ”SpaceX launches more Starlink satellites, tests design change for astronomers,” Spaceflight Now, 7 January 2020, URL: https://spaceflightnow.com/2020/01/07/spacex-launches-more-starlink-satellites-tests-design-change-for-astronomers/
81) Stephen Clark, ”Successful launch continues deployment of SpaceX’s Starlink network,” Spaceflight Now, 11 November 2019, URL: https://spaceflightnow.com/2019/11/11/successful-launch-continues-deployment-of-spacexs-starlink-network/
82) Chris Gebhardt, ”Falcon 9 launches first Starlink mission – heaviest payload launch by SpaceX to date,” NASA Spaceflight.com, 23 May 2019, URL: https://www.nasaspaceflight.com/2019/05/first-starlink-mission-heaviest-payload-launch-spacex/
83) ”Sixty Launched ... 11,940 Left to Go ... as SpaceX Successfully Sends Off Their First Batch of Starlink Satellites,” Satnews Daily, 24 May 2019, URL: http://www.satnews.com/story.php?number=179808724
84) ”SpaceX launches first satellites of its internet network,” Space Daily, 24 May 2019, URL: http://www.spacedaily.com/reports/SpaceX_launches_first_satellites_of_its_internet_network_999.html .
85) Sandra Erwin, ”Intelsat rolls out network service that integrates Starlink and geostationary satellites,” SpaceNews, 26 March 2022, URL: https://spacenews.com/intelsat-rolls-out-network-service-that-integrates-starlink-and-geostationary-satellites/
86) Jeff Foust, ”Dozens of Starlink satellites from latest launch to reenter after geomagnetic storm,” SpaceNews, 9 February 2022, URL: https://spacenews.com/dozens-of-starlink-satellites-from-latest-launch-to-reenter-after-geomagnetic-storm/
88) ”Palomar Survey Instrument Analyzes Impact of Starlink Satellites,” Caltech News, 17 January 2022, URL: https://www.caltech.edu/about/news/palomar-survey-instrument-analyzes-impact-of-starlink-satellites
89) Przemek Mróz, Angel Otarola, Thomas A. Prince, Richard Dekany, Dmitry A. Duev, Matthew J. Graham, Steven L. Groom, Frank J. Masci, and Michael S. Medford,”Impact of the SpaceX Starlink Satellites on the Zwicky Transient Facility Survey Observations,” The Astrophysical Journal Letters, Volume 924, Number 2, Published: 14 January 2022, https://doi.org/10.3847/2041-8213/ac470a, URL: https://iopscience.iop.org/article/10.3847/2041-8213/ac470a/pdf
90) Jeff Foust, ”SpaceX emphasizes coordination with other satellite operators,” SpaceNews, 16 September 2021, URL: https://spacenews.com/spacex-emphasizes-coordination-with-other-satellite-operators/
91) Jason Rainbow, ”Starlink teams up with Google for ground infrastructure,” SpaceNews, 13 May 2021, URL: https://spacenews.com/starlink-teams-up-with-google-for-ground-infrastructure/
92) Jason Rainbow, ”SpaceX takes aim at satellite mobility operators with Starlink expansion,” SpaceNews, 8 March 2021, URL: https://spacenews.com/spacex-takes-aim-at-satellite-mobility-operators-with-starlink-expansion/
93) ”French village says 'non' to Elon Musk's space-age internet,” Space Daily, 19 February 2021, URL: https://www.spacedaily.com/reports/French_village_says_non_to_Elon_Musks_space-age_internet_999.html
94) Michael Sheetz, ”SpaceX says its Starlink satellite internet service now has over 10,000 users,” CNBC, 4 February 2021, URL: https://www.cnbc.com/2021/02/04/spacex-starlink-satellite-internet-service-has-over-10000-users.html
96) Jeff Foust, ”FCC grants permission for polar launch of Starlink satellites,” SpaceNews, 9 January 2021, URL: https://spacenews.com/fcc-grants-permission-for-polar-launch-of-starlink-satellites/
97) ”Dark coating can reduce satellite reflectivity,” Science Daily, 8 December 2020, URL: https://www.sciencedaily.com/releases/2020/12/201208090000.htm
98) Takashi Horiuchi, Hidekazu Hanayama, and Masatoshi Ohishi, ”Simultaneous Multicolor Observations of Starlink's Darksat by the Murikabushi Telescope with MITSuME,” The Astrophysical Journal, Volume 905, Number 1, Published: 7 December 2020, https://doi.org/10.3847/1538-4357/abc695
99) ”SpaceX wins $885 million for Starlink broadband service,” Space Daily, 7 December 2020, URL: https://www.spacedaily.com/reports/SpaceX_wins_885_million_for_Starlink_broadband_service_999.html
100) Jeff Foust, ”Report outlines measures to reduce impact of satellite constellations on astronomy,” SpaceNews, 26 August 2020, URL: https://spacenews.com/report-outlines-measures-to-reduce-impact-of-satellite-constellations-on-astronomy/
101) C. Walker, J. Hall, L. Allen, P. Seitzer, A. Tyson, A. Bauer, K. Krafton, J. Lownthal, J. Parriott, P. Puxley, T. Abbott, G. Bakos, J. Barentine, C. Bassa, J. Blakeslee, A. Bradshaw, J. Cooke, D. Devost, D. Galadi, F. Haase, O. Hainaut, S. Heathcote, M. Jah, H. Krantz, D. Kucharski, J. McDowell, P. Mroz, A. Otarola, E. Pearce, M. Rawls, C. Saunders, R. Seaman, J. Siminski, A. Snyder, L. Storrie-Lombardi, J. Tregloan-Reed, R. Wainscoat, A. Williams, and P. Yoachim, ”Satellite Constellations 1 Workshop Report,” AAS, 25 August 2020, URL: https://aas.org/satellite-constellations-1-workshop-report
102) ”Strings of pearls in the night sky – the Starlink satellite project,” DLR, 15 May 2020, URL: https://www.dlr.de/content/en/articles/news/2020/02/20200515_the-starlink-satellite-project.html
103) Jeff Foust, ”SpaceX to test Starlink “sun visor” to reduce brightness,” SpaceNews, 27 April 2020, URL: https://spacenews.com/spacex-to-test-starlink-sun-visor-to-reduce-brightness/
104) ”Killer asteroid hunt in jeopardy, new study claims,” Space Daily, 19 March 2020, URL: https://www.spacedaily.com/reports/Killer_asteroid_hunt_in_jeopardy_new_study_claims_999.html
105) Jonathan McDowell, ”The Low Earth Orbit Satellite Population and Impacts of the SpaceX Starlink Constellation,” Draft Version 16 March 2020, Submitted to ApJL (Astrophysical Journal), URL: https://planet4589.org/space/papers/starlink20.pdf
107) Oliver R. Hainaut, Andrew P. Williams, ”Impact of satellite constellations on astronomical observations with ESO telescopes in the visible and infrared domains,” Astronomy & Astrophysics, 3 March 2020, https://doi.org/10.1051/0004-6361/202037501, URL: https://www.aanda.org/articles/aa/pdf/forth/aa37501-20.pdf
108) Troy Farah, ”Light pollution from satellites will get worse. But how much?,” Nature Astronomy News, 14 June 2019, URL: http://www.astronomy.com/news/2019/06/light-pollution-from-satellites-will-get-worse-but-how-much
Alexandra Witze, ”SpaceX tests black satellite to reduce
‘megaconstellation’ threat to astronomy — Latest
launch includes ‘DarkSat’ prototype to reduce reflection
from fleets of broadband Internet satellites,” Nature Astronomy
News, 9 January 2020, URL: https://www.nature.com/articles/d41586-020-00041-4
The information compiled and edited in this article was provided by Herbert J. Kramer from his documentation of: ”Observation of the Earth and Its Environment: Survey of Missions and Sensors” (Springer Verlag) as well as many other sources after the publication of the 4th edition in 2002. - Comments and corrections to this article are always welcome for further updates (email@example.com)
Spacecraft Launches Mission Status References Back to top