Mars 2020 rover mission of NASA/JPL
Mars 2020 Mission Overview. The Mars 2020 rover mission is part of NASA's Mars Exploration Program, a long-term effort of robotic exploration of the Red Planet. The Mars 2020 mission addresses high-priority science goals for Mars exploration, including key questions about the potential for life on Mars. The mission takes the next step by not only seeking signs of habitable conditions on Mars in the ancient past, but also searching for signs of past microbial life itself. The Mars 2020 rover introduces a drill that can collect core samples of the most promising rocks and soils and set them aside in a "cache" on the surface of Mars. The mission also provides opportunities to gather knowledge and demonstrate technologies that address the challenges of future human expeditions to Mars. These include testing a method for producing oxygen from the Martian atmosphere, identifying other resources (such as subsurface water), improving landing techniques, and characterizing weather, dust, and other potential environmental conditions that could affect future astronauts living and working on Mars. 1) 2) 3)
The mission is timed for a launch opportunity in July/August 2020 when Earth and Mars are in good positions relative to each other for landing on Mars. That is, it takes less power to travel to Mars at this time, compared to other times when Earth and Mars are in different positions in their orbits. To keep mission costs and risks as low as possible, the Mars 2020 design is based on NASA's successful Mars Science Laboratory mission architecture, including its Curiosity rover and proven landing system.
Mars 2020 Science
The Mars 2020 rover explores a site likely to have been habitable. It will seek signs of past life, set aside a returnable cache with the most compelling rock core and soil samples, and demonstrate technology needed for the future human and robotic exploration of Mars. 4)
Figure 1: Evolving science strategies for Mars Explorations (image credit: NASA)
Leveraging discoveries from past Mars missions about water and habitability on Mars, the Mars 2020 rover represents a shift toward directly seeking signs of past microbial life.
NASA's Mars Exploration Program has a long-term, systematic exploration plan for the Red Planet. Mars missions build on each other, with discoveries and innovations made by prior missions guiding what comes next. Mars missions are guided by evolving, discovery-driven science strategies that provide continuity in Mars science exploration themes.
The first framing theme guiding Mars exploration was "Follow the Water," as water is essential to habitable environments and life as we know it. It is also important to understanding the geologic and climatic history of Mars, and would likely play a role in supporting future human explorers.
With past orbiters, landers, and rovers finding evidence of water, the theme "Explore Habitability" emerged to look for additional conditions necessary to life, including chemical elements and compounds necessary for life as we know it. Findings from the Mars Science Laboratory's Curiosity rover marked a transition to the current science theme: "Seek Signs of Life."
While Curiosity is seeking evidence of habitable conditions (both past water and the chemistry needed for life), Mars 2020 is seeking signs of past life itself in the geologic record.
The Mars 2020 Mission Contributes to Four Science Goals for Mars Exploration
Studying Mars' Habitability, Seeking Signs of Past Microbial Life, Collecting and Caching Samples, and Preparing for Future Human Missions. The science strategy for NASA's Mars Exploration Program (MEP) is to Seek Signs of Life. The Mars 2020 rover contributes to this strategy, as well as to the Program's four long-term science goals: 5)
• Goal 1: Determine whether life ever existed on Mars. The mission of the Mars 2020 rover focuses on surface-based studies of the Martian environment, seeking preserved signs of biosignatures in rock samples that formed in ancient Martian environments with conditions that might have been favorable to microbial life.
- It is the first rover mission designed to seek signs of past microbial life. Earlier rovers first focused on and confirmed that Mars once had habitable conditions.
• Goal 2: Characterize the Climate of Mars. Past Martian climate conditions are a focus of the Mars 2020 rover mission. The rover's instruments are looking for evidence of ancient habitable environments where microbial life could have existed in the past.
• Goal 3: Characterize the Geology of Mars. The Mars 2020 rover is designed to study the rock record to reveal more about the geologic processes that created and modified the Martian crust and surface through time. Each layer of rock on the Martian surface contains a record of the environment in which it was formed. The rover seeks evidence of rocks that formed in water and that preserve evidence of organics, the chemical building blocks of life.
• Goal 4: Prepare for Human Exploration. The Mars 2020 rover is demonstrating key technologies for using natural resources in the Martian environment for life support and fuel. It is also monitoring environmental conditions so mission planners understand better how to protect future human explorers.
- This science goal relates to national space policy for sending humans to Mars in the 2030s. Similar to the history of the exploration of Earth's moon, robotic missions to Mars provide a crucial understanding of the environment and test innovative technologies for future human exploration.
- Investments in Mars 2020 technologies include contributions from NASA's Human Exploration and Operations (HEO) Mission Directorate and Space Technology Program (STP) as part of NASA's long-term efforts to develop future capabilities for human space exploration.
The spacecraft is the protective "spaceship" that enables the precious cargo (that is, the rover!) to travel between Earth and Mars. It is separate from the launch vehicle that carries the spacecraft and the rover outside of Earth's atmosphere and gravitational pull. The spacecraft includes the mechanical units that safely carry and maneuver the rover through the Martian atmosphere to a landing on Mars.
The three major parts of the Mars 2020 mission spacecraft design are based on the successful Mars Science Laboratory mission:
• Cruise Stage: The configuration for travel between Earth and Mars that includes an aeroshell (backshell with heat shield) in which the rover and its landing system are enclosed.
• Entry, Descent, and Landing System: The configuration for entry into the Martian atmosphere. Includes the aeroshell, parachute, descent vehicle, and structure for a sky-crane maneuver that will lower the rover to the Martian surface on tethers.
• Rover: A wheeled vehicle with science instruments for making discoveries on the Martian surface.
Figure 2: Illustration of the Mars 2020 spacecraft (image credit: NASA)
Technology development makes missions possible.
Each Mars mission is part of a continuing chain of innovation. Each relies on past missions for proven technologies and contributes its own innovations to future missions. This chain allows NASA to push the boundaries of what is currently possible, while still relying on proven technologies.
The Mars 2020 mission leverages the successful architecture of NASA's Mars Science Laboratory mission by duplicating most of its entry, descent, and landing system and much of its rover design.
The mission advances several technologies, including those related to priorities in the National Research Council's 2011 Decadal Survey and for future human missions to Mars. Plans include infusing new capabilities through investments by NASA's Space Technology Program, Human Exploration and Operations Mission Directorate, and contributions from international partners.
Many innovations focus on entry, descent, and landing technologies, which help ensure precise and safe landings. They include sensors to measure the atmosphere, cameras and a microphone, and at least two key ways to reach the surface of Mars with greater accuracy and less risk (Range Trigger and Terrain-Relative Navigation).
Figure 3: The cruise stage, aeroshell, descent stage, rover and heat shield together make up the spacecraft. As the spacecraft travels down through the Martian atmosphere, certain parts fall away one by one until the rover is safely on solid Martian ground (image credit: NASA)
Figure 4: Leveraging heritage technology: Mars Rover Curiosity's sky-crane maneuver. This artist's concept shows the sky-crane maneuver during the descent of NASA's Curiosity rover to the Martian surface. The Mars mission launching in 2020 would leverage the design of this landing system and other aspects of the Mars Science Laboratory architecture (image credit: NASA/JPL-Caltech)
Mars 2020 Rover Perseverance
The Mars 2020 rover is car-sized, about about 3 m long, 2.7 m wide, and 2.2 m tall (not including the arm). But at 1,050 kg, it weighs less than a compact car. In some sense, the rover parts are similar to what any living creature would need to keep it "alive" and able to explore. 6)
Figure 5: The Mars 2010 rover is a wheeled vehicle with science instruments for making discoveries on the Martian surface (image credit: NASA)
Figure 6: Mars 2020 Rover build update. Tour the Spacecraft Assembly Facility at NASA's Jet Propulsion Laboratory and see the Mars 2020 mission under construction. Project System Engineer Jennifer Trosper explains the hardware being built and tested, including the rover, descent stage, cruise stage, back shell, and heat shield (video credit: NASA/JPL-Caltech, Published on 19 February 2019)
The Mars 2020 Rover has the following parts: 7)
• body: a structure that protects the rover's "vital organs"
• brains: computers to process information
• temperature controls: internal heaters, a layer of insulation, and more
• "neck and head": a mast for the cameras to give the rover a human-scale view
• eyes and ears : cameras and instruments that give the rover information about its environment
• arm and "hand": a way to extend its reach and collect rock samples for study
• wheels and legs: parts for mobility
• electrical power: batteries and power
• communications: antennas for "speaking" and "listening"
The Mars 2020 rover body is based on the Mars Science Laboratory's Curiosity rover configuration. However, the Mars 2020 rover has a new science and technology toolbox. An important difference is that this rover can sample and cache minerals. To do so, the rover has a new coring drill to collect samples. The samples are then sealed in tubes and placed on the surface of Mars. - In the future, another space mission could potentially pick up the samples and bring them to Earth for detailed analysis. 8)
Differences between Mars 2020 and Curiosity
The large robotic arm on the front of the rover differs from Curiosity's for two main reasons:
1) Mars 2020 will collect rock cores. Mars 2020 needs to collect rock core samples and save them for possible future study by scientists. Curiosity studied samples collected onsite, using the rover's onboard laboratory.
2) Mars 2020 has a larger "hand," or turret. Mars 2020's new functions and new science tools means it must accommodate a larger turret at the end of the robot arm. This turret has the coring drill and two science instruments, plus a color camera for close-up surface inspection and also "selfies" for engineering health checkups.
There is an internal workspace inside the rover body that is dedicated to picking up, moving and placing drill bits and sample tubes within the Sample Caching System. New motors that drive these specialized movements were needed beyond those used on rover Curiosity. The rover motor controller electronics have been modified from the Curiosity design to accommodate these motors.
New Software to Operate the Rover
Mars 2020 will operate very differently than Curiosity. The new rover will gather 20 sealed samples of Martian rocks and soil. The samples will be set aside in a "cache" on Mars. The team is building new software to run the rover. The software will be updated with improvements throughout the mission.
Besides just managing the new sampling operations, the Mars 2020 rover manages all of its daily activities more efficiently to balance its on-site science measurements while also collecting samples for potential future analysis. To do that, the rover's driving software - the "brains" for moving around — was changed to give Mars 2020 greater independence than Curiosity ever had.
This allows Mars 2020 to cover more ground without consulting controllers on Earth so frequently. Also, engineers have added a "simple planner" to the flight software. This allows more effective and autonomous use of electrical power and other rover resources. It allows the rover to shift the time of some activities to take advantage of openings in the daily operations schedule.
New Wheels for Mars 2020
Engineers redesigned the Mars 2020 wheels to be more robust due to the wear and tear the Curiosity rover wheels endured while driving over sharp, pointy rocks. Mars 2020's wheels are narrower than Curiosity's, but bigger in diameter and made of thicker aluminum.
The combination of the larger instrument suite, new Sampling and Caching System, and modified wheels makes Mars 2020 heavier than its predecessor, Curiosity.
The Mars 2020 Rover's "Brains"
The computer module is called the Rover Compute Element (RCE) - there are actually two identical RCEs in the body so there is always a spare "brain." 9)
The RCE interfaces with the engineering functions of the rover over two networks which follow an aerospace industry standard designed especially for the high-reliability requirements of airplanes and spacecraft. In addition, the RCEs have a special purpose to direct interfaces with all of the rover instruments for exchange of commands and science data.
- Processor: Radiation-hardened central processor with PowerPC 750 Architecture: a BAE RAD 750. It operates at up to 200 MHz speed, 10 times the speed in Mars rovers Spirit and Opportunity's computers.
- Memory: 2 GB of flash memory (~8 times as much as Spirit or Opportunity). 256 MB of dynamic random access memory. 256 kB of electrically erasable programmable read-only memory.
The Cameras on the Mars 2020 Rover
The rover has several cameras focused on engineering and science tasks. Some help us land on Mars, while others serve as our “eyes” on the surface to drive around. We use others to do scientific observations and aid in the collection of samples. 10)
- Main function: Take pictures, looking up and down, during descent through Martian atmosphere.
- Location: Mounted on the fore-port-side of the rover, pointing toward the ground.
- Main function: Used for driving around on Mars and for positioning the tools on the robotic arm
- Location: Various places on the rover
- Mass: < 425 grams
- Image size: 5120 x 3840 pixels
- Image resolution: 20 Mpixel
• Science Cameras The science cameras are:
- MastCam-Z is a pair of cameras that takes color images and video, three-dimensional stereo images, and has a powerful zoom lens. Like the Mastcam cameras on the Curiosity rover, Mastcam-Z on Mars 2020 consists of two duplicate camera systems mounted on the mast that stands up from the rover deck. The cameras are next to each other and point in the same direction, providing a 3D view similar to what human eyes would see, only better. They also have a zoom function to see details of faraway targets.
- SuperCam, fires a laser at mineral targets that are beyond the reach of the rover’s robotic arm, and then analyzes the vaporized rock to reveal its elemental composition. Like the ChemCam on rover Curiosity, SuperCam fires laser pulses at pinpoint areas smaller than 1 mm from more than 7 meters away. Its camera and spectrometers then examine the rock's chemistry. It seeks organic compounds that could be related to past life on Mars. When the laser hits the rock, it creates plasma, which is an extremely hot gas made of free-floating ions and electrons. An on-board spectrograph records the spectrum of the plasma, which reveals the composition of the material.
- PIXL, uses X-ray fluorescence to identify chemical elements in target spots as small as a grain of table salt. It has a Micro-Context Camera to provide images of to correlate its elemental composition maps with visible characteristics of the target area.
- SHERLOC. Its main tools are spectrometers and a laser, but it also uses a macro camera to take extreme close-ups of the areas that are studied. This provides context so that scientists can see textures that might help tell the story of the environment in which the rock formed.
- WATSON. This camera is one of the tools on the "arm" or turret at the end of Curiosity's robotic arm. It is almost identical to the MAHLI hand-lens camera on the Curiosity rover. WATSON captures the larger context images for the very detailed information that SHERLOC collects on Martian mineral targets. WATSON provides views of the fine-scale textures and structures in Martian rocks and the surface layer of rocky debris and dust. Since WATSON can be moved around on the robotic arm, it also provides other images of rover parts and geological targets that can be used by other arm-mounted instruments. For example, it can be pointed at the oxygen-making experiment MOXIE to help monitor how much dust accumulates around the inlet that lets in Martian air for the extraction of oxygen. - A calibration target for WATSON is attached to the front of the rover body. It contains, a metric standardized bar graphic to help calibrate the instrument.
Figure 7: Overview of the Cameras on the Mars 2020 Perseverance Rover (image credit: NASA)
Mars 2020 communications
Mars 2020 has three antennas that serve as both its "voice" and its "ears." They are located on the rover equipment deck (its "back"). Having multiple antennas provides operational flexibility and back-up options just in case they are needed. Antennas on rover deck: 11)
UHF antenna: Most often, Mars 2020 uses its ultra-high frequency (UHF) antenna (about 400 megahertz) to communicate with Earth through NASA's orbiters around Mars. Because the rover and orbiter antennas are within close range of each other, they act a little like walky-talkies compared to the long-range telecommunications with Earth provided by the low-gain and high-gain antennas.
It generally takes about 5 to 20 minutes for a radio signal to travel the distance between Mars and Earth, depending on planet positions. Using orbiters to relay messages is beneficial because they are much closer to the rover than the Deep Space Network (DSN) antennas on Earth. The mass- and power-constrained rover can achieve high data rates of up to 2 Mbit/s on the relatively short-distance relay link to the orbiters overhead. The orbiters then use their much larger antennas and transmitters to relay that data on the long-distance link back to Earth.
- Main function: Transmitting data to Earth through Mars Orbiters
- Radio frequency: UHF-band at ~400 MHz
- Transmission rates: Up to 2 Mbit/s on the rover-to-orbiter relay link.
X-band High-Gain Antenna: The high-gain antenna is steerable so it can point its radio beam in a specific direction. The benefit of having a steerable antenna is that the entire rover doesn't need to change position to talk to Earth, which is always moving in the Martian sky. Like turning your neck to talk to someone beside you rather than turning your entire body, the rover can save energy and keep things simple by moving only the antenna. Its high gain allows it to focus its beam, allowing higher data rates on the long link back to Earth.
- Main function: Transmitting data directly to and from Earth
- Radio frequency: X-band (7 to 8 GHz)
- Size: Hexagonally shaped, 0.3 m in diameter
- Transmission/ Reception Rates: 160/500 bit/s or faster to/from the Deep Space Network's 34 m diameter antennas or at 800/3000 bit/s or faster to/from the Deep Space Network's 70 m diameter antenna.
- Provided by: Spain.
X-band Low-Gain Antenna: Mars 2020 uses its low-gain antenna primarily for receiving signals. This antenna can send and receive information in every direction; that is, it is "omnidirectional." The antenna transmits at low data rate to the Deep Space Network antennas on Earth. Because it doesn’t need to be pointed, it provides a robust way to always communicate with the rover.
- Main function: Receiving antenna
- Radio frequency: X-band (7 to 8 GHz)
- Reception rates: Approximately 10 bit/s or faster from the Deep Space Network's 34 m diameter antennas or approximately 30 bit/s or faster from the Deep Space Network's 70 m diameter antenna.
Mars 2020 robotic arm
Mars 2020's robotic arm can move a lot like yours. It has a shoulder, elbow and wrist "joints" for maximum flexibility. The arm lets the rover work as a human geologist would: by holding and using science tools with its "hand" or turret. The rover's own "hand tools" extract cores from rocks, takes microscopic images and analyzes the elemental composition and mineral makeup of Martian rocks and soil. 12)
- Length: 2.1 m
- Degrees of freedom:
- There are five. They are made possible by tiny motors called "rotary actuators." The five degrees of freedom are known as the shoulder azimuth joint, shoulder elevation joint, elbow joint, wrist joint and turret joint.
- ”Hand” turret: At the end of the arm is the "turret." It's like a hand that carries scientific cameras, mineral and chemical analyzers for studying the past habitability of Mars, and choosing the most scientifically valuable sample to cache.
- Names of tools on the turret: SHERLOC and WATSON, PIXL, GDRT (Gaseous Dust Removal Tool), Ground Contact Sensor, Drill
- Drill: The drill is a rotary percussive drill designed to extract rock core samples from the surface of Mars.
- Drill bits: A suite of interchangeable bits: coring bits, regolith bit and an abrader.
- Main function: Assist in Mars surface investigation and sample collection
- Diameter of drilled holes: 27 mm.
The Mars 2020 mission will gather samples from Martian rocks and soil using its drill. The rover will then store the sample cores in tubes on the Martian surface. This entire process is called "sample caching". 13)
Mars 2020 will be the first mission to demonstrate this on Mars. It could potentially pave the way for future missions that could collect the samples and return them to Earth for intensive laboratory analysis.
The three major steps in sample handling are:
- Objectives: Collect and store a compelling set of rock and soil samples that could be returned to earth in the future.
- Witness tubes: 5 tubes
- Sample containers: 43 containers
- Samples to be collected: at least 20 samples
The Mars 2020 rover requires electrical power to operate. Without power, the rover cannot move, use its science instruments, or communicate with Earth.
Mars 2020 carries a radioisotope power system. This power system produces a dependable flow of electricity using the heat of plutonium's radioactive decay as its "fuel."
The power source is called the MMRTG (Multi-Mission Radioisotope Thermoelectric Generator). The MMRTG converts heat from the natural radioactive decay of plutonium into electricity. This power system charges the rover's two primary batteries. The heat from the MMRTG is also used to keep the rover's tools and systems at their correct operating temperatures.
The Department of Energy (DOE), in support of NASA, has developed several generations of such space nuclear power systems that can be used to supply electricity — and useful excess heat — for a variety of space exploration missions. The current RPS (Radioisotope Power System), called a Multi-Mission Radioisotope Thermoelectric Generator (MMRTG), was designed with the flexibility to operate on planetary bodies with atmospheres, such as at Mars, as well as in the vacuum of space. An MMRTG generates about 110 W of electrical power at launch, an increment of power that can be matched with a variety of potential mission needs. As with prior RPS, ensuring a high degree of safety is also a fundamental consideration. 14)
How RTGs work: RTGs work by converting heat from the natural decay of radioisotope materials into electricity. RTGs consist of two major elements: a heat source that contains the radioisotope fuel (mostly plutonium-238), and solid-state thermocouples that convert the plutonium’s decay heat energy to electricity.
Conversion of heat directly into electricity is a scientific principle discovered two centuries ago. German scientist Thomas Johann Seebeck observed that an electric voltage is produced when two dissimilar, electrically conductive materials are joined in a closed circuit and the two junctions are kept at different temperatures. Such pairs of junctions are called thermoelectric couples (or thermocouples).
The power output from such thermocouples is a function of the temperature of each junction and the properties of the thermoelectric materials. The thermocouples in RTGs use heat from the natural decay of the radioisotope fuel to heat the hot-side junction of the thermocouple, and the cold of space to produce a low temperature at the cold-side junction
Figure 8: Model of an MMRTG, including its internal General Purpose Heat Source (GPHS) modules (image credit: NASA)
- Objective: Provide electricity to the rover
- Location: Aft end of the rover
- Size: 64 cm in diameter by 66 cm long
- Mass: ~45 kg
- Power system: Uses 4.8 kg of plutonium dioxide as the source of the steady supply of heat
- Electrical power produced: About 110 W at launch, declining a few percent per year
- Batteries: Two lithium-ion rechargeable batteries to meet peak demands of rover activities when the demand temporarily exceeds the MMRTG's steady electrical output levels.
- Reliability: The electrical power system on the Mars 2020 rover is just like the one used on the Mars Science Laboratory Curiosity rover. NASA has used similar power systems reliably for decades, including the Apollo missions to the Moon, the Viking missions to Mars, and on spacecraft that flew to the outer planets and Pluto, including the Pioneer, Voyager, Ulysses, Galileo, Cassini, and New Horizons missions.
- Safety: Built with several layers of rugged protective material to contain its fuel in a wide range of potential launch accidents, verified through impact testing. The heat source plutonium is manufactured in a ceramic form, which helps it avoid being a significant health hazard unless broken into very fine pieces or vaporized, and then inhaled or swallowed. In the unlikely event of a Mars 2020 launch accident, those who might be exposed could receive an average dose of 15-60 millirem. A resident of the United States receives, on average, 310 millirem of radiation each year from natural sources, such as radon and cosmic rays from space.
This power system provides several advantages:
• The 14-year operational lifetime of an MMRTG provides significant reserve for Mars 2020 prime mission duration of 1.5 Mars years (three Earth years)
• It gives the rover greater mobility over a large range of latitudes and altitudes
• It allows scientists to maximize the capabilities of the rover's science instruments
• It provides engineers with a lot of flexibility in operating the rover (e.g., day and night, and through the winter season).
Note: As of July 2020, the previously single large Mars2020 file has been split into three files, to make the file handling manageable for all parties concerned, in particular for the user community. The chapter ”Development Status” has so high-resolution imagery, that it had to be split into two files.
• This file covers the Mars 2020 mission and its imagery without the Development Status
Launch: The Mars 2020 mission was launched from the Cape Canaveral Air Force Station (SLC-41) in Florida on July 30, 2020 (11:50 UTC) on a two-stage Atlas V-541 launch vehicle, provided by ULA (United Launch Alliance). The mission will land at the Jezero Crater on 18 February 2021. 15) 16)
- "With the launch of Perseverance, we begin another historic mission of exploration," said NASA Administrator Jim Bridenstine. "This amazing explorer's journey has already required the very best from all of us to get it to launch through these challenging times. Now we can look forward to its incredible science and to bringing samples of Mars home even as we advance human missions to the Red Planet. As a mission, as an agency, and as a country, we will persevere."
- The ULA Atlas V's Centaur upper stage initially placed the Mars 2020 spacecraft into a parking orbit around Earth. The engine fired for a second time and the spacecraft separated from the Centaur as expected. Navigation data indicate the spacecraft is perfectly on course to Mars.
Figure 9: A United Launch Alliance Atlas V rocket with NASA’s Mars 2020 Perseverance rover onboard launches from Space Launch Complex 41, Thursday, July 30, 2020, at Cape Canaveral Air Force Station in Florida. The Perseverance rover is part of NASA’s Mars Exploration Program, a long-term effort of robotic exploration of the Red Planet (image credit: NASA, Joel Kowsky)
The Mars 2020 spacecraft separated from the rocket’s Centaur upper stage 57 minutes after liftoff and five minutes after a second burn of the Centaur that placed the spacecraft on a trajectory toward Mars.
Perseverance is based on the Curiosity rover that has been on Mars since August 2012, but with a number of modifications. “We’re carrying about 50% more surface payload than Curiosity did, and that was by far the most complex thing we had ever done up until that time,” Matt Wallace, Mars 2020 deputy program manager, said at a pre-launch briefing.
Much of that additional payload, and complexity, is for the rover’s system to collect samples of Martian rocks. The rover will cache up to three dozen samples in tubes for return to Earth by two later missions that NASA is developing in cooperation with the European Space Agency for launch in 2026.
The rover includes several other upgrades. A terrain relative navigation system will compare images taken by the spacecraft during its descent to the Martian surface with maps on the spacecraft, and direct the spacecraft accordingly to enable a pinpoint landing. Engineers also upgraded the rover’s wheels after rocks damaged the wheels on Curiosity.
In addition to its payload of sample collection equipment and scientific experiments, Perseverance is carrying a small helicopter called Ingenuity. The 1.8-kilogram helicopter, stored on the rover’s belly pan, will be released after landing for a series of flight tests.
“We as human beings have never flown a rotorcraft outside of our Earth’s atmosphere, so this will be very much a Wright Brothers moment,” said Mimi Aung, Ingenuity Mars Helicopter project manager at JPL, during a pre-launch briefing. Engineers hope to perform several flights of Ingenuity over 30 days to test its performance.
Aung compared Ingenuity to Sojourner, the small rover flown on the Mars Pathfinder lander mission in 1997, paving the way for larger rovers like Perseverance. “This Mars helicopter, Ingenuity, could lead to the opening of a whole new way to explore,” she said.
• March 23, 2021: NASA is targeting no earlier than April 8 for the Ingenuity Mars Helicopter to make the first attempt at powered, controlled flight of an aircraft on another planet. Before the 4-pound (1.8 kg) rotorcraft can attempt its first flight, however, both it and its team must meet a series of daunting milestones. 17)
- Ingenuity remains attached to the belly of NASA’s Perseverance rover, which touched down on Mars Feb. 18. On March 21, the rover deployed the guitar case-shaped graphite composite debris shield that protected Ingenuity during landing. The rover currently is in transit to the “airfield” where Ingenuity will attempt to fly. Once deployed, Ingenuity will have 30 Martian days, or sols, (31 Earth days) to conduct its test flight campaign.
- “When NASA’s Sojourner rover landed on Mars in 1997, it proved that roving the Red Planet was possible and completely redefined our approach to how we explore Mars. Similarly, we want to learn about the potential Ingenuity has for the future of science research,” said Lori Glaze, director of the Planetary Science Division at NASA Headquarters. “Aptly named, Ingenuity is a technology demonstration that aims to be the first powered flight on another world and, if successful, could further expand our horizons and broaden the scope of what is possible with Mars exploration.”
- Flying in a controlled manner on Mars is far more difficult than flying on Earth. The Red Planet has significant gravity (about one-third that of Earth’s) but its atmosphere is just 1% as dense as Earth’s at the surface. During Martian daytime, the planet’s surface receives only about half the amount of solar energy that reaches Earth during its daytime, and nighttime temperatures can drop as low as minus 130 degrees Fahrenheit (minus 90 degrees Celsius), which can freeze and crack unprotected electrical components.
- To fit within the available accommodations provided by the Perseverance rover, the Ingenuity helicopter must be small. To fly in the Mars environment, it must be lightweight. To survive the frigid Martian nights, it must have enough energy to power internal heaters. The system – from the performance of its rotors in rarified air to its solar panels, electrical heaters, and other components – has been tested and retested in the vacuum chambers and test labs of NASA’s Jet Propulsion Laboratory in Southern California.
- “Every step we have taken since this journey began six years ago has been uncharted territory in the history of aircraft,” said Bob Balaram, Mars Helicopter chief engineer at JPL. “And while getting deployed to the surface will be a big challenge, surviving that first night on Mars alone, without the rover protecting it and keeping it powered, will be an even bigger one.”
Figure 10: An illustration of NASA’s Ingenuity Helicopter flying on Mars (image credit: NASA/JPL-Caltech)
Deploying the Helicopter
- Before Ingenuity takes its first flight on Mars, it must be squarely in the middle of its airfield – a 33-by-33-foot (10-by-10-meter) patch of Martian real estate chosen for its flatness and lack of obstructions. Once the helicopter and rover teams confirm that Perseverance is situated exactly where they want it to be inside the airfield, the elaborate process to deploy the helicopter on the surface of Mars begins.
- “As with everything with the helicopter, this type of deployment has never been done before,” said Farah Alibay, Mars Helicopter integration lead for the Perseverance rover. “Once we start the deployment there is no turning back. All activities are closely coordinated, irreversible, and dependent on each other. If there is even a hint that something isn’t going as expected, we may decide to hold off for a sol or more until we have a better idea what is going on.”
- The helicopter deployment process will take about six sols (six days, four hours on Earth). On the first sol, the team on Earth will activate a bolt-breaking device, releasing a locking mechanism that helped hold the helicopter firmly against the rover’s belly during launch and Mars landing. The following sol, they will fire a cable-cutting pyrotechnic device, enabling the mechanized arm that holds Ingenuity to begin rotating the helicopter out of its horizontal position. This is also when the rotorcraft will extend two of its four landing legs.
- During the third sol of the deployment sequence, a small electric motor will finish rotating Ingenuity until it latches, bringing the helicopter completely vertical. During the fourth sol, the final two landing legs will snap into position. On each of those four sols, the Wide Angle Topographic Sensor for Operations and eNgineering (WATSON) imager will take confirmation shots of Ingenuity as it incrementally unfolds into its flight configuration. In its final position, the helicopter will hang suspended at about 5 inches (13 centimeters) over the Martian surface. At that point, only a single bolt and a couple dozen tiny electrical contacts will connect the helicopter to Perseverance. On the fifth sol of deployment, the team will use the final opportunity to utilize Perseverance as a power source and charge Ingenuity’s six battery cells.
- “Once we cut the cord with Perseverance and drop those final five inches to the surface, we want to have our big friend drive away as quickly as possible so we can get the Sun’s rays on our solar panel and begin recharging our batteries,” said Balaram.
- On the sixth and final scheduled sol of this deployment phase, the team will need to confirm three things: that Ingenuity’s four legs are firmly on the surface of Jezero Crater, that the rover did, indeed, drive about 16 feet (about 5 meters) away, and that both helicopter and rover are communicating via their onboard radios. This milestone also initiates the 30-sol clock during which time all preflight checks and flight tests must take place.
- “Ingenuity is an experimental engineering flight test – we want to see if we can fly at Mars,” said MiMi Aung, project manager for Ingenuity Mars Helicopter at JPL. “There are no science instruments onboard and no goals to obtain scientific information. We are confident that all the engineering data we want to obtain both on the surface of Mars and aloft can be done within this 30-sol window.”
- As with deployment, the helicopter and rover teams will approach the upcoming flight test methodically. If the team misses or has questions about an important preflight milestone, they may take one or more sols to better understand the issue. If the helicopter survives the first night of the sequence period on the surface of Mars, however, the team will spend the next several sols doing everything possible to ensure a successful flight, including wiggling the rotor blades and verifying the performance of the inertial measurement unit, as well as testing the entire rotor system during a spin-up to 2,537 rpm (while Ingenuity’s landing gear remain firmly on the surface).
The First Flight Test on Mars
- Once the team is ready to attempt the first flight, Perseverance will receive and relay to Ingenuity the final flight instructions from JPL mission controllers. Several factors will determine the precise time for the flight, including modeling of local wind patterns plus measurements taken by the Mars Environmental Dynamics Analyzer (MEDA) aboard Perseverance. Ingenuity will run its rotors to 2,537 rpm and, if all final self-checks look good, lift off. After climbing at a rate of about 3 feet per second (1 meter per second), the helicopter will hover at 10 feet (3 m) above the surface for up to 30 seconds. Then, the Mars Helicopter will descend and touch back down on the Martian surface.
- Several hours after the first flight has occurred, Perseverance will downlink Ingenuity’s first set of engineering data and, possibly, images and video from the rover’s Navigation Cameras and Mastcam-Z. From the data downlinked that first evening after the flight, the Mars Helicopter team expect to be able to determine if their first attempt to fly at Mars was a success.
- On the following sol, all the remaining engineering data collected during the flight, as well as some low-resolution black-and-white imagery from the helicopter’s own Navigation Camera, could be downlinked to JPL. The third sol of this phase, the two images taken by the helicopter’s high-resolution color camera should arrive. The Mars Helicopter team will use all information available to determine when and how to move forward with their next test.
- “Mars is hard,” said Aung. “Our plan is to work whatever the Red Planet throws at us the very same way we handled every challenge we’ve faced over the past six years – together, with tenacity and a lot of hard work, and a little Ingenuity.”
A Piece of History
- While Ingenuity will attempt the first powered, controlled flight on another planet, the first powered, controlled flight on Earth took place Dec. 17, 1903, on the windswept dunes of Kill Devil Hill, near Kitty Hawk, North Carolina. Orville and Wilbur Wright covered 120 feet in 12 seconds during the first flight. The Wright brothers made four flights that day, each longer than the previous.
- A small amount of the material that covered one of the wings of the Wright brothers’ aircraft, known as the Flyer, during the first flight is now aboard Ingenuity. An insulative tape was used to wrap the small swatch of fabric around a cable located underneath the helicopter’s solar panel. The Wrights used the same type of material – an unbleached muslin called “Pride of the West” – to cover their glider and aircraft wings beginning in 1901. The Apollo 11 crew flew a different piece of the material, along with a small splinter of wood from the Wright Flyer, to the Moon and back during their iconic mission in July 1969.
More About Ingenuity
- The Ingenuity Mars Helicopter was built by JPL, which also manages the technology demonstration for NASA Headquarters. It is supported by NASA’s Science Mission Directorate, the NASA Aeronautics Research Mission Directorate, and the NASA Space Technology Mission Directorate. NASA’s Ames Research Center and Langley Research Center provided significant flight performance analysis and technical assistance.
- At NASA Headquarters, Dave Lavery is the program executive for the Ingenuity Mars Helicopter. At JPL, MiMi Aung is the project manager and J. (Bob) Balaram is chief engineer.
- Bring the excitement of Ingenuity into classrooms and homes through NASA’s Office of STEM Engagement toolkit. Educators, students, and families can follow along the mission by building a paper helicopter or coding an Ingenuity video game.
• March 15, 2021: New Study Challenges Long-Held Theory of Fate of Mars’ Water. The new science results indicate that a large quantity of the Red Planet’s water is trapped in its crust rather than having escaped into space. 18)
- Billions of years ago, according to geological evidence, abundant water flowed across Mars and collected into pools, lakes, and deep oceans. New NASA-funded research shows a substantial quantity of its water – between 30 and 99% – is trapped within minerals in the planet’s crust, challenging the current theory that due to the Red Planet’s low gravity, its water escaped into space.
- Early Mars was thought to have enough water to have covered the whole planet in an ocean roughly 100 to 1,500 meters (330 to 4,920 feet) deep – a volume roughly equivalent to half of Earth’s Atlantic Ocean. While some of this water undeniably disappeared from Mars via atmospheric escape, the new findings, published in the latest issue of Science, conclude it does not account for most of its water loss.
- The results were presented at the 52nd Lunar and Planetary Science Conference (LPSC) by lead author and Caltech Ph.D. candidate Eva Scheller along with co-authors Bethany Ehlmann, professor of planetary science at Caltech and associate director for the Keck Institute for Space Studies; Yuk Yung, professor of planetary science at Caltech and senior research scientist at NASA’s Jet Propulsion Laboratory; Danica Adams, Caltech graduate student; and Renyu Hu, JPL research scientist.
- “Atmospheric escape doesn’t fully explain the data that we have for how much water actually once existed on Mars,” said Scheller.
- Using a wealth of cross-mission data archived in NASA’s Planetary Data System (PDS), the research team integrated data from multiple NASA Mars Exploration Program missions and meteorite lab work. Specifically, the team studied the quantity of water on the Red Planet over time in all its forms (vapor, liquid, and ice) and the chemical composition of the planet’s current atmosphere and crust, looking in particular at the ratio of deuterium to hydrogen (D/H).
- While water is made up of hydrogen and oxygen, not all hydrogen atoms are created equal. The vast majority of hydrogen atoms have just one proton within the atomic nucleus, while a tiny fraction (about 0.02%) exists as deuterium, or so-called “heavy” hydrogen, which has a proton and a neutron. The lighter-weight hydrogen escapes the planet’s gravity into space much easier than its denser counterpart. Because of this, the loss of a planet’s water via the upper atmosphere would leave a revealing sign on the ratio of deuterium to hydrogen in the planet’s atmosphere: There would be a very large amount of deuterium left behind.
- However, the loss of water solely through the atmosphere cannot explain both the observed deuterium-to-hydrogen signal in the Martian atmosphere and large amounts of water in the past. Instead, the study proposes that a combination of two mechanisms – the trapping of water in minerals in the planet’s crust and the loss of water to the atmosphere – can explain the observed deuterium-to-hydrogen signal within the Martian atmosphere.
- “The hydrated materials on our own planet are being continually recycled through plate tectonics,” said Michael Meyer, lead scientist for NASA’s Mars Exploration Program at the agency’s headquarters in Washington. “Because we have measurements from multiple spacecraft, we can see that Mars doesn’t recycle, and so water is now locked up in the crust or been lost to space.”
Figure 11: This global view of Mars is composed of about 100 Viking Orbiter images (image credit: NASA/JPL-Caltech/USGS)
- A key objective of NASA’s Mars 2020 Perseverance rover mission on Mars is astrobiology, including the search for signs of ancient microbial life. The rover will characterize the planet’s geology and past climate, pave the way for human exploration of the Red Planet, and be the first mission to collect and cache Martian rock and regolith (broken rock and dust). Scheller and Ehlmann will aid in operations by the Perseverance rover to collect these samples that will be returned to Earth through the Mars Sample Return program, which will allow the highly-anticipated further examination of these hypotheses about the drivers of Mars climate change. Understanding the evolution of the Martian environment is important context for understanding results from analyses of the returned samples as well as understanding how habitability changes over time on rocky planets.
- The research and findings outlined in the paper highlight the significant contributions of early career scientists in expanding our understanding of the solar system. Similarly, the research, which relied on data from meteorites, telescopes, satellite observations, and samples analyzed by rovers on Mars, illustrates the importance of having multiple ways of probing the Red Planet.
- This work was supported by a NASA Habitable Worlds award, a NASA Earth and Space Science Fellowship (NESSF) award, and a NASA Future Investigator in NASA Earth and Space Science and Technology (FINESST) award.
• March 5, 2021: The first trek of the agency’s largest, most advanced rover yet on the Red Planet marks a major milestone before science operations get under way. 19)
- NASA’s Mars 2020 Perseverance rover performed its first drive on Mars March 4, covering 21.3 feet (6.5 meters) across the Martian landscape. The drive served as a mobility test that marks just one of many milestones as team members check out and calibrate every system, subsystem, and instrument on Perseverance. Once the rover begins pursuing its science goals, regular commutes extending 656 feet (200 meters) or more are expected.
- “When it comes to wheeled vehicles on other planets, there are few first-time events that measure up in significance to that of the first drive,” said Anais Zarifian, Mars 2020 Perseverance rover mobility test bed engineer at NASA’s Jet Propulsion Laboratory in Southern California. “This was our first chance to ‘kick the tires’ and take Perseverance out for a spin. The rover’s six-wheel drive responded superbly. We are now confident our drive system is good to go, capable of taking us wherever the science leads us over the next two years.”
Figure 12: This image was taken during the first drive of NASA's Perseverance rover on Mars on March 4, 2021. This image was taken by the rover's Navigation Cameras (image credit: NASA/JPL-Caltech)
- Upcoming events and evaluations include more detailed testing and calibration of science instruments, sending the rover on longer drives, and jettisoning covers that shield both the adaptive caching assembly (part of the rover’s Sample Caching System) and the Ingenuity Mars Helicopter during landing. The experimental flight test program for the Ingenuity Mars Helicopter will also take place during the rover’s commissioning.
- Through it all, the rover is sending down images from the most advanced suite of cameras ever to travel to Mars. The mission’s cameras have already sent about 7,000 images. On Earth, Perseverance’s imagery flows through the powerful Deep Space Network (DSN), managed by NASA’s Space Communications and Navigation (SCaN) program. In space, several Mars orbiters play an equally important role.
- “Orbiter support for downlink of data has been a real gamechanger,” said Justin Maki, chief engineer for imaging and the imaging scientist for the Mars 2020 Perseverance rover mission at JPL. “When you see a beautiful image from Jezero, consider that it took a whole team of Martians to get it to you. Every picture from Perseverance is relayed by either the European Space Agency’s Trace Gas Orbiter, or NASA’s MAVEN, Mars Odyssey, or Mars Reconnaissance Orbiter. They are important partners in our explorations and our discoveries.”
- The sheer volume of imagery and data already coming down on this mission has been a welcome bounty for Matt Wallace, who recalls waiting anxiously for the first images to trickle in during NASA’s first Mars rover mission, Sojourner, which explored Mars in 1997. On March 3, Wallace became the mission’s new project manager. He replaced John McNamee, who is stepping down as he intended, after helming the project for nearly a decade.
- “John has provided unwavering support to me and every member of the project for over a decade,” said Wallace. “He has left his mark on this mission and team, and it has been my privilege to not only call him boss but also my friend.”
Touchdown Site Named
- With Perseverance departing from its touchdown site, mission team scientists have memorialized the spot, informally naming it for the late science fiction author Octavia E. Butler. The groundbreaking author and Pasadena, California, native was the first African American woman to win both the Hugo Award and Nebula Award, and she was the first science fiction writer honored with a MacArthur Fellowship. The location where Perseverance began its mission on Mars now bears the name “Octavia E. Butler Landing.”
- Official scientific names for places and objects throughout the solar system – including asteroids, comets, and locations on planets – are designated by the International Astronomical Union. Scientists working with NASA’s Mars rovers have traditionally given unofficial nicknames to various geological features, which they can use as references in scientific papers.
- “Butler’s protagonists embody determination and inventiveness, making her a perfect fit for the Perseverance rover mission and its theme of overcoming challenges,” said Kathryn Stack Morgan, deputy project scientist for Perseverance. “Butler inspired and influenced the planetary science community and many beyond, including those typically under-represented in STEM fields.”
- “I can think of no better person to mark this historic landing site than Octavia E. Butler, who not only grew up next door to JPL in Pasadena, but she also inspired millions with her visions of a science-based future,” said Thomas Zurbuchen, NASA associate administrator for science. “Her guiding principle, ‘When using science, do so accurately,’ is what the science team at NASA is all about. Her work continues to inspire today’s scientists and engineers across the globe – all in the name of a bolder, more equitable future for all.”
- Butler, who died in 2006, authored such notable works as “Kindred,” “Bloodchild,” “Speech Sounds,” “Parable of the Sower,” “Parable of the Talents,” and the “Patternist” series. Her writing explores themes of race, gender, equality, and humanity, and her works are as relevant today as they were when originally written and published.
• February 25, 2021: Testing spacecraft components prior to flight is vital for a successful mission. Rarely do you get a do-over with a spacecraft after it launches especially those bound for another planet. You need to do everything possible to get it right the first time. 20)
- Three successful sounding rocket missions from NASA’s Wallops Flight Facility in Virginia in 2017 and 2018 to test a supersonic parachute proved their worth with the successful landing of the Perseverance mission on the red plant.
Figure 13: Landing site of Perseverance Rover on Mars. - The descent stage holding NASA’s Perseverance rover can be seen falling through the Martian atmosphere, its parachute trailing behind, in this image taken on Feb. 18, 2021, by the High Resolution Imaging Experiment (HiRISE) camera aboard the Mars Reconnaissance Orbiter (image credit: NASA/JPL-Caltech)
Figure 14: This animated gif shows the deployment of the Mars 2020 parachute on Feb. 18, 2021 (image credit: NASA/JPL Cal-Tech)
- After a 203-day journey traversing 293 million miles, the supersonic parachutes, designed to slow the rover’s descent to the planet’s surface, successfully deployed and inflated leading to the smooth touchdown of Perseverance.
- “This mission required us to design and build a 72-ft parachute that could survive inflating in a Mach 2 wind in about half a second. This is an extraordinary engineering challenge, but one that was absolutely necessary for the mission,” said Ian Clark, the test’s technical lead from NASA’s Jet Propulsion Laboratory in Southern California. “To ensure they worked at Mars under those harsh conditions, we had to test our parachute designs here at Earth first. Replicating the Martian environment meant that we needed to get our payload half way to the edge of space and going twice the speed of sound. Sounding rockets were critical to our testing and ultimately our landing on Mars.”
- The NASA team tested the parachute three times in Mars-relevant conditions, using Black Brant IX sounding rockets. The final test flight exposed the chute to a 67,000-pound (300,000- Newton) load — the highest ever survived by a supersonic parachute and about 85% higher than what the mission's chute was expected to encounter during deployment in Mars' atmosphere.
- “When the spacecraft successfully touched down last week it was a great feeling of accomplishment for the parachute testing team,” said Giovanni Rosanova, chief of the NASA Sounding Rockets Program Office at Wallops. “Placing the test component in the right conditions with a sounding rocket was challenging and the importance of the tests to the success of the Mars landing was an exciting motivating factor for the team. We are proud to have been a part of this mission.”
- Rosanova said, “One of the beauties of suborbital vehicles is that an instrument or its components can be flown, improved, and then re-flown. This can be done within a few years, providing the opportunity for scientists to work out the bugs before flying on a spacecraft.”
- In the case of the Mars 2020 parachutes, the first flight was a test to see if the right conditions can be achieved during the flight to simulate what the parachutes will encounter descending through the Mars’ atmosphere. The second flight, 6 months later in March 2018, was the first full test of the parachute. The final successful test conducted in September 2018 provided the results needed for the Perseverance parachute team to be confident that the design was ready for the Mars 2020 mission.
- NASA is currently developing plans for a Mars Sample Return mission to retrieve the rocks and soil samples collected by Perseverance and return them to Earth. Teams are preparing to test concepts for the Mars Ascent Vehicle that will carry the collected samples from the planet’s surface.
• February 22, 2021: The agency’s newest rover captured first-of-its-kind footage of its Feb. 18 touchdown and has recorded audio of Martian wind. 21)
- New video from NASA’s Mars 2020 Perseverance rover chronicles major milestones during the final minutes of its entry, descent, and landing (EDL) on the Red Planet on Feb. 18 as the spacecraft plummeted, parachuted, and rocketed toward the surface of Mars. A microphone on the rover also has provided the first audio recording of sounds from Mars.
- From the moment of parachute inflation, the camera system covers the entirety of the descent process, showing some of the rover’s intense ride to Mars’ Jezero Crater. The footage from high-definition cameras aboard the spacecraft starts 7 miles (11 km) above the surface, showing the supersonic deployment of the most massive parachute ever sent to another world, and ends with the rover’s touchdown in the crater.
Figure 15: This is a high-resolution version of a video taken by several cameras as NASA’s Perseverance rover touched down on Mars. Cameras aboard the rover captured these shots; a microphone captured the first-ever audio of a Mars landing (video credit: NASA/JPL-Caltech)
- A microphone attached to the rover did not collect usable data during the descent, but the commercial off-the-shelf device survived the highly dynamic descent to the surface and obtained sounds from Jezero Crater on Feb. 20. About 10 seconds into the 60-second recording, a Martian breeze is audible for a few seconds, as are mechanical sounds of the rover operating on the surface.
- “For those who wonder how you land on Mars – or why it is so difficult – or how cool it would be to do so – you need look no further,” said acting NASA Administrator Steve Jurczyk. “Perseverance is just getting started, and already has provided some of the most iconic visuals in space exploration history. It reinforces the remarkable level of engineering and precision that is required to build and fly a vehicle to the Red Planet.”
- Also released Monday was the mission’s first panorama of the rover’s landing location, taken by the two Navigation Cameras located on its mast. The six-wheeled robotic astrobiologist, the fifth rover the agency has landed on Mars, currently is undergoing an extensive checkout of all its systems and instruments.
- “This video of Perseverance’s descent is the closest you can get to landing on Mars without putting on a pressure suit,” said Thomas Zurbuchen, NASA associate administrator for science. “It should become mandatory viewing for young women and men who not only want to explore other worlds and build the spacecraft that will take them there, but also want to be part of the diverse teams achieving all the audacious goals in our future.”
- The world’s most intimate view of a Mars landing begins about 230 seconds after the spacecraft entered the Red Planet’s upper atmosphere at 12,500 mph (20,100 km/h). The video opens in black, with the camera lens still covered within the parachute compartment. Within less than a second, the spacecraft’s parachute deploys and transforms from a compressed 18-by-26 inch (46-by-66 cm) cylinder of nylon, Technora, and Kevlar into a fully inflated 70.5-foot-wide (21.5-meter-wide) canopy – the largest ever sent to Mars. The tens of thousands of pounds of force that the parachute generates in such a short period stresses both the parachute and the vehicle.
- “Now we finally have a front-row view to what we call ‘the seven minutes of terror’ while landing on Mars,” said Michael Watkins, director of NASA’s Jet Propulsion Laboratory in Southern California, which manages the mission for the agency. “From the explosive opening of the parachute to the landing rockets’ plume sending dust and debris flying at touchdown, it’s absolutely awe-inspiring.”
- The video also captures the heat shield dropping away after protecting Perseverance from scorching temperatures during its entry into the Martian atmosphere. The downward view from the rover sways gently like a pendulum as the descent stage, with Perseverance attached, hangs from the back shell and parachute. The Martian landscape quickly pitches as the descent stage – the rover’s free-flying “jetpack,” which decelerates using rocket engines and then lowers the rover on cables to the surface – breaks free, its eight thrusters engaging to put distance between it and the now-discarded back shell and the parachute.
- Then, 80 seconds and 7,000 feet (2,130 meters) later, the cameras capture the descent stage performing the sky crane maneuver over the landing site – the plume of its rocket engines kicking up dust and small rocks that have likely been in place for billions of years.
- “We put the EDL camera system onto the spacecraft not only for the opportunity to gain a better understanding of our spacecraft’s performance during entry, descent, and landing, but also because we wanted to take the public along for the ride of a lifetime – landing on the surface of Mars,” said Dave Gruel, lead engineer for Mars 2020 Perseverance’s EDL camera and microphone subsystem at JPL. “We know the public is fascinated with Mars exploration, so we added the EDL Cam microphone to the vehicle because we hoped it could enhance the experience, especially for visually-impaired space fans, and engage and inspire people around the world.”
- The footage ends with Perseverance’s aluminum wheels making contact with the surface at 1.61 mph (2.6 km/h), and then pyrotechnically fired blades sever the cables connecting it to the still-hovering descent stage. The descent stage then climbs and accelerates away in the preplanned flyaway maneuver.
- “If this were an old Western movie, I’d say the descent stage was our hero riding slowly into the setting Sun, but the heroes are actually back here on Earth,” said Matt Wallace, Mars 2020 Perseverance deputy project manager at JPL. “I’ve been waiting 25 years for the opportunity to see a spacecraft land on Mars. It was worth the wait. Being able to share this with the world is a great moment for our team.”
- Five commercial off-the-shelf cameras located on three different spacecraft components collected the imagery. Two cameras on the back shell, which encapsulated the rover on its journey, took pictures of the parachute inflating. A camera on the descent stage provided a downward view – including the top of the rover – while two on the rover chassis offered both upward and downward perspectives.
- The rover team continues its initial inspection of Perseverance’s systems and its immediate surroundings. Monday, the team will check out five of the rover’s seven instruments and take the first weather observations with the Mars Environmental Dynamics Analyzer instrument. In the coming days, a 360-degree panorama of Jezero by the Mastcam-Z should be transmitted down, providing the highest resolution look at the road ahead.
Figure 16: This panorama, taken on Feb. 20, 2021, by the Navigation Cameras aboard NASA's Perseverance Mars rover, was stitched together from six individual images after they were sent back to Earth (image credit: NASA/JPL-Caltech)
• February 19, 2021: Perseverance's First Full-Color Look at Mars. The rover will characterize the planet's geology and past climate, pave the way for human exploration of the Red Planet, and be the first mission to collect and cache Martian rock and regolith (broken rock and dust). 22)
- Subsequent NASA missions, in cooperation with ESA (the European Space Agency), would send spacecraft to Mars to collect these cached samples from the surface and return them to Earth for in-depth analysis.
Figure 17: This is the first high-resolution, color image to be sent back by the Hazard Cameras (Hazcams) on the underside of NASA's Perseverance Mars rover after its landing on Feb. 18, 2021 (image credit: NASA/JPL-Caltech)
• February 18, 2021: The agency’s latest and most complex mission to the Red Planet has touched down at Jezero Crater. Now it’s time to begin testing the health of the rover. 23)
- The largest, most advanced rover NASA has sent to another world touched down on Mars Thursday, after a 203-day journey traversing 293 million miles (472 million kilometers). Confirmation of the successful touchdown was announced in mission control at NASA’s Jet Propulsion Laboratory in Southern California at 3:55 p.m. EST (12:55 p.m. PST).
- Packed with groundbreaking technology, the Mars 2020 mission launched July 30, 2020, from Cape Canaveral Space Force Station in Florida. The Perseverance rover mission marks an ambitious first step in the effort to collect Mars samples and return them to Earth.
- “This landing is one of those pivotal moments for NASA, the United States, and space exploration globally – when we know we are on the cusp of discovery and sharpening our pencils, so to speak, to rewrite the textbooks,” said acting NASA Administrator Steve Jurczyk. “The Mars 2020 Perseverance mission embodies our nation’s spirit of persevering even in the most challenging of situations, inspiring, and advancing science and exploration. The mission itself personifies the human ideal of persevering toward the future and will help us prepare for human exploration of the Red Planet.”
Figure 18: After a seven-month-long journey, NASA’s Perseverance Rover successfully touched down on the Red Planet on Feb. 18, 2021. Mission controllers at NASA's Jet Propulsion Laboratory in Southern California celebrate landing NASA's fifth — and most ambitious — rover on Mars (video credit: NASA/JPL-Caltech)
- About the size of a car, the 2,263-pound (1,026 kg) robotic geologist and astrobiologist will undergo several weeks of testing before it begins its two-year science investigation of Mars’ Jezero Crater. While the rover will investigate the rock and sediment of Jezero’s ancient lakebed and river delta to characterize the region’s geology and past climate, a fundamental part of its mission is astrobiology, including the search for signs of ancient microbial life. To that end, the Mars Sample Return campaign, being planned by NASA and ESA (European Space Agency), will allow scientists on Earth to study samples collected by Perseverance to search for definitive signs of past life using instruments too large and complex to send to the Red Planet.
- “Because of today’s exciting events, the first pristine samples from carefully documented locations on another planet are another step closer to being returned to Earth,” said Thomas Zurbuchen, associate administrator for science at NASA. “Perseverance is the first step in bringing back rock and regolith from Mars. We don’t know what these pristine samples from Mars will tell us. But what they could tell us is monumental – including that life might have once existed beyond Earth.”
- Some 28 miles (45 km) wide, Jezero Crater sits on the western edge of Isidis Planitia, a giant impact basin just north of the Martian equator. Scientists have determined that 3.5 billion years ago the crater had its own river delta and was filled with water.
- The power system that provides electricity and heat for Perseverance through its exploration of Jezero Crater is a Multi-Mission Radioisotope Thermoelectric Generator, or MMRTG. The U.S. Department of Energy (DOE) provided it to NASA through an ongoing partnership to develop power systems for civil space applications.
- Equipped with seven primary science instruments, the most cameras ever sent to Mars, and its exquisitely complex sample caching system – the first of its kind sent into space – Perseverance will scour the Jezero region for fossilized remains of ancient microscopic Martian life, taking samples along the way.
Figure 19: This is the first image NASA's Perseverance rover sent back after touching down on Mars on 18 February 2021. The view, from one of Perseverance's Hazard Cameras, is partially obscured by a dust cover (image credit: NASA/JPL-Caltech)
Figure 20: Cheers erupted in mission control at NASA's Jet Propulsion Laboratory as controllers confirmed that NASA's Perseverance rover, with the Ingenuity Mars Helicopter attached to its belly, has touched down safely on Mars. Engineers are analyzing the data flowing back from the spacecraft (image credit: NASA/JPL-Caltech)
- “Perseverance is the most sophisticated robotic geologist ever made, but verifying that microscopic life once existed carries an enormous burden of proof,” said Lori Glaze, director of NASA’s Planetary Science Division. “While we’ll learn a lot with the great instruments we have aboard the rover, it may very well require the far more capable laboratories and instruments back here on Earth to tell us whether our samples carry evidence that Mars once harbored life.”
Paving the Way for Human Missions
- “Landing on Mars is always an incredibly difficult task and we are proud to continue building on our past success,” said JPL Director Michael Watkins. “But, while Perseverance advances that success, this rover is also blazing its own path and daring new challenges in the surface mission. We built the rover not just to land but to find and collect the best scientific samples for return to Earth, and its incredibly complex sampling system and autonomy not only enable that mission, they set the stage for future robotic and crewed missions.”
- The Mars Entry, Descent, and Landing Instrumentation 2 (MEDLI2) sensor suite collected data about Mars’ atmosphere during entry, and the Terrain-Relative Navigation system autonomously guided the spacecraft during final descent. The data from both are expected to help future human missions land on other worlds more safely and with larger payloads.
- On the surface of Mars, Perseverance’s science instruments will have an opportunity to scientifically shine. Mastcam-Z is a pair of zoomable science cameras on Perseverance’s remote sensing mast, or head, that creates high-resolution, color 3D panoramas of the Martian landscape. Also located on the mast, the SuperCam uses a pulsed laser to study the chemistry of rocks and sediment and has its own microphone to help scientists better understand the property of the rocks, including their hardness.
- Located on a turret at the end of the rover’s robotic arm, the Planetary Instrument for X-ray Lithochemistry (PIXL) and the Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals (SHERLOC) instruments will work together to collect data on Mars’ geology close-up. PIXL will use an X-ray beam and suite of sensors to delve into a rock’s elemental chemistry. SHERLOC’s ultraviolet laser and spectrometer, along with its Wide Angle Topographic Sensor for Operations and eNgineering (WATSON) imager, will study rock surfaces, mapping out the presence of certain minerals and organic molecules, which are the carbon-based building blocks of life on Earth.
- The rover chassis is home to three science instruments, as well. Radar Imager for Mars’ Subsurface Experiment (RIMFAX) is the first ground-penetrating radar on the surface of Mars and will be used to determine how different layers of the Martian surface formed over time. The data could help pave the way for future sensors that hunt for subsurface water ice deposits.
- Also with an eye on future Red Planet explorations, the Mars Oxygen In-Situ Resource Utilization Experiment (MOXIE) technology demonstration will attempt to manufacture oxygen out of thin air – the Red Planet’s tenuous and mostly carbon dioxide atmosphere. The rover’s Mars Environmental Dynamics Analyzer (MEDA) instrument, which has sensors on the mast and chassis, will provide key information about present-day Mars weather, climate, and dust.
- Currently attached to the belly of Perseverance, the diminutive Ingenuity Mars Helicopter is a technology demonstration that will attempt the first powered, controlled flight on another planet.
- Project engineers and scientists will now put Perseverance through its paces, testing every instrument, subsystem, and subroutine over the next month or two. Only then will they deploy the helicopter to the surface for the flight test phase. If successful, Ingenuity could add an aerial dimension to exploration of the Red Planet in which such helicopters serve as a scouts or make deliveries for future astronauts away from their base.
- Once Ingenuity’s test flights are complete, the rover’s search for evidence of ancient microbial life will begin in earnest.
- “Perseverance is more than a rover, and more than this amazing collection of men and women that built it and got us here,” said John McNamee, project manager of the Mars 2020 Perseverance rover mission at JPL. “It is even more than the 10.9 million people who signed up to be part of our mission. This mission is about what humans can achieve when they persevere. We made it this far. Now, watch us go.”
More About the Mission
- A primary objective for Perseverance’s mission on Mars is astrobiology research, including the search for signs of ancient microbial life. The rover will characterize the planet’s geology and past climate and be the first mission to collect and cache Martian rock and regolith, paving the way for human exploration of the Red Planet.
- Subsequent NASA missions, in cooperation with ESA, will send spacecraft to Mars to collect these cached samples from the surface and return them to Earth for in-depth analysis.
- The Mars 2020 Perseverance mission is part of NASA’s Moon to Mars approach, which includes Artemis missions to the Moon that will help prepare for human exploration of the Red Planet.
- JPL, a division of Caltech in Pasadena, California, manages the Mars 2020 Perseverance mission and the Ingenuity Mars Helicopter technology demonstration for NASA.
• February 16, 2021: What to expect when the Mars 2020 Perseverance rover arrives at the Red Planet on Feb. 18, 2021. 24)
- With about 2.4 million miles (3.9 million km) left to travel in space, NASA’s Mars 2020 Perseverance mission is days away from attempting to land the agency’s fifth rover on the Red Planet. Engineers at NASA’s Jet Propulsion Laboratory in Southern California, where the mission is managed, have confirmed that the spacecraft is healthy and on target to touch down in Jezero Crater at around 3:55 p.m. EST (12:55 p.m. PST) on Feb. 18, 2021.
- “Perseverance is NASA’s most ambitious Mars rover mission yet, focused scientifically on finding out whether there was ever any life on Mars in the past,” said Thomas Zurbuchen, associate administrator for the Science Mission Directorate at NASA Headquarters in Washington. “To answer this question, the landing team will have its hands full getting us to Jezero Crater – the most challenging Martian terrain ever targeted for a landing.”
- Jezero is a basin where scientists believe an ancient river flowed into a lake and deposited sediments in a fan shape known as a delta. Scientists think the environment here was likely to have preserved signs of any life that gained a foothold billions of years ago – but Jezero also has steep cliffs, sand dunes, and boulder fields. Landing on Mars is difficult – only about 50% of all previous Mars landing attempts have succeeded – and these geological features make it even more so. The Perseverance team is building on lessons from previous touchdowns and employing new technologies that enable the spacecraft to target its landing site more accurately and avoid hazards autonomously.
- “The Perseverance team is putting the final touches on the complex choreography required to land in Jezero Crater,” said Jennifer Trosper, deputy project manager for the mission at JPL. “No Mars landing is guaranteed, but we have been preparing a decade to put this rover’s wheels down on the surface of Mars and get to work.”
Figure 21: The aeroshell containing NASA’s Perseverance rover guides itself toward the Martian surface as it descends through the atmosphere in this illustration. Hundreds of critical events must execute perfectly and exactly on time for the rover to land on Mars safely on Feb. 18, 2021. Full Image Details (image credit: NASA/JPL-Caltech)
• February 8, 2021: After a nearly seven-month journey to Mars, NASA’s Perseverance rover is slated to land at the Red Planet’s Jezero Crater Feb. 18, 2021, a rugged expanse chosen for its scientific research and sample collection possibilities. 25)
Figure 22: Mars 2020’s Perseverance rover is equipped with a lander vision system based on terrain-relative navigation, an advanced method of autonomously comparing real-time images to preloaded maps that determine the rover’s position relative to hazards in the landing area. Divert guidance algorithms and software can then direct the rover around those obstacles if needed (image credit: NASA/JPL-Caltech)
- But the very features that make the site fascinating to scientists also make it a relatively dangerous place to land – a challenge that has motivated rigorous testing here on Earth for the lander vision system (LVS) that the rover will count on to safely touch down.
- “Jezero is 28 miles wide, but within that expanse there are a lot of potential hazards the rover could encounter: hills, rock fields, dunes, the walls of the crater itself, to name just a few,” said Andrew Johnson, principal robotics systems engineer at NASA’s Jet Propulsion Laboratory in Southern California. “So, if you land on one of those hazards, it could be catastrophic to the whole mission.”
- Enter Terrain-Relative Navigation (TRN), the mission-critical technology at the heart of the LVS that captures photos of the Mars terrain in real time and compares them with onboard maps of the landing area, autonomously directing the rover to divert around known hazards and obstacles as needed.
Figure 23: Masten’s Xombie VTVL system sits on a launchpad in Mojave, California in December 2014, prepared for a flight test that would help prove lander vision system capabilities for the Mars 2020 Perseverance rover mission (image credit: Masten Space Systems)
- “For Mars 2020, LVS will use the position information to figure out where the rover is relative to safe spots between those hazards. And in one of those safe spots is where the rover will touch down,” explained Johnson.
- If Johnson sounds confident that LVS will work to land Perseverance safely, that’s because it allows the rover to determine its position relative to the ground with an an accuracy of about 200 feet or less. That low margin of error and high degree of assurance are by design, and the result of extensive testing both in the lab and in the field.
- “We have what we call the trifecta of testing,” explained JPL’s Swati Mohan, guidance, navigation, and control operations lead for Mars 2020.
Figure 24: Landing NASA’s Mars 2020 Rover with Terrain Relative Navigation. 2014 flight tests on Masten’s Xombie VTVL system demonstrated the lander vision system’s terrain-relative navigation and fuel-optimal large divert guidance (G-FOLD) capabilities. The flights proved the system’s ability to autonomously change course to avoid hazards on descent and adopt a newly calculated path to a safe landing site. The successful field tests enabled the technology to be greenlighted for inclusion on NASA’s Mars 2020 mission (video credit: NASA/JPL-Caltech)
- Mohan said that the first two testing areas – hardware and simulation – were done in a lab.
- “That’s where we test every condition and variable we can. Vacuum, vibration, temperature, electrical compatibility – we put the hardware through its paces,” said Mohan. “Then with simulation, we model various scenarios that the software algorithms may encounter on Mars – a too-sunny day, very dark day, windy day – and we make sure the system behaves as expected regardless of those conditions.”
- But the third piece of the trifecta – the field tests – require actual flights to put the lab results through further rigor and provide a high level of technical readiness for NASA missions. For LVS’s early flight tests, Johnson and team mounted the LVS to a helicopter and used it to estimate the vehicle’s position automatically as it was flying.
- “That got us to a certain level of technical readiness because the system could monitor a wide range of terrain, but it didn’t have the same kind of descent that Perseverance will have,” said Johnson. “There was also a need to demonstrate LVS on a rocket.”
- That need was met by NASA’s Flight Opportunities program, which facilitated two 2014 flights in the Mojave Desert on Masten Space Systems’ Xombie – a vertical takeoff and vertical landing (VTVL) system that functions similarly to a lander. The flight tests demonstrated LVS’s ability to direct Xombie to autonomously change course and avoid hazards on descent by adopting a newly calculated path to a safe landing site. Earlier flights on Masten’s VTVL system also helped validate algorithms and software used to calculate fuel-optimal trajectories for planetary landings.
- “Testing on the rocket laid pretty much all remaining doubts to rest and answered a critical question for the LVS operation affirmatively,” said JPL’s Nikolas Trawny, a payload and pointing control systems engineer who worked closely with Masten on the 2014 field tests. “It was then that we knew LVS would work during the high-speed vertical descent typical of Mars landings.”
- Johnson added that the suborbital testing in fact increased the technology readiness level to get the final green light of acceptance into the Mars 2020 mission.
- “The testing that Flight Opportunities is set up to provide was really unprecedented within NASA at the time,” said Johnson. “But it’s proven so valuable that it’s now becoming expected to do these types of flight tests. For LVS, those rocket flights were the capstone of our technology development effort.”
- With the technology accepted for Mars 2020, the mission team began to build the final version of LVS that would fly on Perseverance. In 2019, a copy of that system flew on one more helicopter demonstration in Death Valley, California, facilitated by NASA’s Technology Demonstration Missions program. The helicopter flight provided a final check on over six-years of multiple field tests.
- But Mohan pointed out that even with these successful demonstrations, there will be more work to do to ensure a safe landing. She’ll be at Mission Control for the landing, monitoring the health of the system every step of the way.
- “Real life can always throw you curve balls. So, we’ll be monitoring everything during the cruise phase, checking power to the camera, making sure the data is flowing as expected,” Mohan said. “And once we get that signal from the rover that says, ‘I’ve landed and I’m on stable ground,’ then we can celebrate.”
About Flight Opportunities
- The Flight Opportunities program is funded by NASA’s Space Technology Mission Directorate (STMD) and managed at NASA’s Armstrong Flight Research Center in Edwards, California. NASA’s Ames Research Center in California’s Silicon Valley manages the solicitation and evaluation of technologies to be tested and demonstrated on commercial flight vehicles.
About Technology Demonstration Missions
- Also under the umbrella of STMD, the program is based at NASA’s Marshall Space Flight Center in Huntsville, Alabama. The program bridges the gap between scientific and engineering challenges and the technological innovations needed to overcome them, enabling robust new space missions.
More About the Mission
- A key objective for Perseverance's mission on Mars is astrobiology, including the search for signs of ancient microbial life. The rover will characterize the planet's geology and past climate, pave the way for human exploration of the Red Planet, and be the first mission to collect and cache Martian rock and regolith (broken rock and dust).
- Subsequent missions, currently under consideration by NASA in cooperation with the European Space Agency, would send spacecraft to Mars to collect these cached samples from the surface and return them to Earth for in-depth analysis.
- The Mars 2020 mission is part of a larger program that includes missions to the Moon as a way to prepare for human exploration of the Red Planet. Charged with returning astronauts to the Moon by 2024, NASA will establish a sustained human presence on and around the Moon by 2028 through NASA's Artemis lunar exploration plans.
- JPL, which is managed for NASA by Caltech in Pasadena, California, built and manages operations of the Perseverance rover.
• January 13, 2021: When the Mars Perseverance rover lands on the Red Planet on Feb. 18, 2021, it will not only collect stunning images and rock samples; the data it returns may also include some recorded sounds from Mars. 26)
- The rover carries a pair of microphones, which – if all goes as planned – will provide interesting and historic audio of the arrival and landing at Mars, along with sounds of the rover at work and of wind and other ambient noise.
- The way many things sound on Earth would be slightly different on the Red Planet. That’s because the Martian atmosphere is only 1% as dense as Earth’s atmosphere at the surface and has a different makeup than ours, which affects sound emission and propagation. But the discrepancy between sounds on Earth and Mars would be much less dramatic than, for example, someone’s voice before and after inhaling helium from a balloon.
- One microphone aboard Perseverance, located on the SuperCam instrument atop the rover’s mast, will be used for science and to record audio of Perseverance and natural sounds on Mars. It will capture sounds of the rover’s laser turning rock into plasma when it hits a target to gather information on rock properties, including hardness. Since the SuperCam microphone is located on the rover’s remote sensing mast, it can be pointed in the direction of a potential sound source.
- “It is stunning all the science we can get with an instrument as simple as a microphone on Mars,” said Baptiste Chide, a postdoctoral researcher in planetary science at NASA’s Jet Propulsion Laboratory and a contributor to the SuperCam microphone.
- An additional experimental microphone aboard the rover will attempt to record sounds during the mission’s super-tricky entry, descent, and landing (EDL). It may capture, for example, sounds of pyrotechnic devices firing to release the parachute, the Martian winds, wheels crunching down on the Martian surface, and the roaring engines of the descent vehicle as it flies safely away from the rover. This mic is off-the-shelf, with one tweak. “We put a little grid at the end of the microphone to protect it from Martian dust,” said Dave Gruel, the Mars 2020 assembly, testing, and launch operations manager and lead for the EDL camera and microphone at JPL.
A Sounding Board for Mars Audio
- SuperCam science team members helped with this interactive experience, providing the scientific lowdown on why audio sounds are different on Mars than on Earth. It is based on theoretical models of sound propagation in a Martian atmosphere.
- The scientists provide three main reasons for the sound differences:
a) Temperature: The colder Martian atmosphere lowers the speed at which sound waves reach the destination microphone. If something is close to the microphone, we probably won’t notice much difference, but more distant sounds may have more noticeable changes.
b) Density: Because the Martian atmosphere is much less dense than ours here on Earth, it will affect how sound waves travel from the source to the detector. Sounds will likely be quieter on Mars, with less signal and noise detectable. It may be harder to hear quiet noises and even some louder ones.
c) Composition of the atmosphere: Because the Mars atmosphere is mostly carbon dioxide (Earth’s atmosphere is mostly nitrogen and oxygen), higher-frequency noises will likely be more attenuated than bass pitches, meaning we probably won’t hear them as well as lower-pitched sounds.
- Chide said, “Sounds on Mars are slightly different than they are on Earth because of the atmospheric composition and its properties. All sounds will be lower in volume due to the low pressure. In addition, the higher-frequency tones will be strongly attenuated by the carbon dioxide molecules. All in all, it would be like listening through a wall.”
- Because we’ve never successfully used microphones on Mars before, this experiment may yield some surprises. While scientists are trying to predict as well as they can how things will sound, they won’t know for sure until Perseverance is on the Red Planet. Whatever they find out, Gruel said, “I think it’s going to be real neat to actually hear sounds from another planet.”
- “Recording audible sounds on Mars is a unique experience,” added Chide. “With the microphones onboard Perseverance, we will add a fifth sense to Mars exploration. It will open a new area of science investigation for both the atmosphere and the surface.”
- The first sounds may be beamed back to Earth and available for the public to hear within days of landing, with a more processed version released about a week after that. The team will process the sounds, with the help of audio experts, to more clearly hear the most interesting sounds.
• November 24, 2020: NASA's Perseverance rover carries a device to convert Martian air into oxygen that, if produced on a larger scale, could be used not just for breathing, but also for fuel. 27)
- One of the hardest things about sending astronauts to Mars will be getting them home. Launching a rocket off the surface of the Red Planet will require industrial quantities of oxygen, a crucial part of propellant: A crew of four would need about 55,000 pounds (25 metric tons) of it to produce thrust from 15,000 pounds (7 metric tons) of rocket fuel.
- That's a lot of propellant. But instead of shipping all that oxygen, what if the crew could make it out of thin (Martian) air? A first-generation oxygen generator aboard NASA's Perseverance rover will test technology for doing exactly that.
- MOXIE (Mars Oxygen In-Situ Resource Utilization Experiment) is an experimental instrument that stands apart from Perseverance's primary science. One of the rover's main purposes is capturing returnable rock samples that could carry signs of ancient microbial life. While Perseverance has a suite of instruments geared toward helping achieve that goal, MOXIE is focused solely on the engineering required for future human exploration efforts.
- Since the dawn of the space age, researchers have talked about in-situ resource utilization, or ISRU. Think of it as living off the land and using what's available in the local environment. That includes things like finding water ice that could be melted for use or sheltering in caves, but also generating oxygen for rocket fuel and, of course, breathing.
- Breathing is just a side benefit of MOXIE's true goal, said Michael Hecht of the Massachusetts Institute of Technology, the instrument's principal investigator. Rocket propellant is the heaviest consumable resource that astronauts will need, so being able to produce oxygen at their destination would make the first crewed trip to Mars easier, safer, and cheaper.
- "What people typically ask me is whether MOXIE is being developed so astronauts have something to breathe," Hecht said. "But rockets breathe hundreds of times as much oxygen as people."
Making Oxygen Requires Heat
- Mars' atmosphere poses a major challenge for human life and rocket propellant production. It's only 1% as thick as Earth's atmosphere and is 95% carbon dioxide.
- MOXIE pulls in that air with a pump, then uses an electrochemical process to separate two oxygen atoms from each molecule of CO2 (Carbon Dioxide). As the gases flow through the system, they are analyzed to check how much oxygen has been produced, how pure it is, and how efficiently the system is working. All the gases are vented back into the atmosphere after each experiment is run.
- Powering this electrochemical conversion requires a lot of heat - about 1,470º Fahrenheit (800º Celsius). Because of those high temperatures, MOXIE, which is a little larger than a toaster, features a variety of heat-tolerant materials. Special 3D-printed nickel alloy parts help distribute the heat within the instrument, while superlight insulation called aerogel minimizes the power needed to keep it at operating temperatures. The outside of MOXIE is coated in a thin layer of gold, which is an excellent reflector of infrared heat and keeps those blistering temperatures from radiating into other parts of Perseverance.
- "MOXIE is designed to make about 6 to 10 grams of oxygen per hour - just about enough for a small dog to breathe," said Asad Aboobaker, a MOXIE systems engineer at NASA's Jet Propulsion Laboratory in Southern California. "A full-scale system geared to make (propellant for the flight home) would need to scale up oxygen production by about 200 times what MOXIE will create."
The Future Martians
- Hecht estimates that a full-scale MOXIE system on Mars might be a bit larger than a household stove with a mass of ~1,000 kg - almost as much as Perseverance itself. Work is ongoing to develop a prototype for one in the near future.
- The team expects to run MOXIE about 10 times over the course of one Mars year (two Earth years), allowing them to watch how well it works in varying seasons. The results will inform the design of future oxygen generators.
- "The commitment to developing MOXIE shows that NASA is serious about this," Hecht said. "MOXIE isn't the complete answer, but it's a critical piece of it. If successful, it will show that future astronauts can rely on this technology to help get them home safely from Mars."
More About the Mission
- A key objective for Perseverance's mission on Mars is astrobiology, including the search for signs of ancient microbial life. The rover will characterize the planet's geology and past climate, pave the way for human exploration of the Red Planet, and be the first mission to collect and cache Martian rock and regolith (broken rock and dust).
- Subsequent missions, currently under consideration by NASA in cooperation with ESA (European Space Agency), would send spacecraft to Mars to collect these cached samples from the surface and return them to Earth for in-depth analysis.
- The Mars 2020 mission is part of a larger program that includes missions to the Moon as a way to prepare for human exploration of the Red Planet. Charged with returning astronauts to the Moon by 2024, NASA will establish a sustained human presence on and around the Moon by 2028 through NASA's Artemis lunar exploration plans.
- JPL, which is managed for NASA by Caltech in Pasadena, California, built and manages operations of the Perseverance rover.
• October 27, 2020: NASA's Mars 2020 Perseverance rover mission has logged a lot of flight miles since being lofted skyward on July 30 - 146.3 million miles (235.4 million km) to be exact. Turns out that is exactly the same distance it has to go before the spacecraft hits the Red Planet's atmosphere like a 11,900 mph (19,000 km/h) freight train on Feb. 18, 2021. 28)
- The Sun's gravitational influence plays a significant role in shaping not just spacecraft trajectories to Mars (as well as to everywhere else in the solar system), but also the relative movement of the two planets. So Perseverance's route to the Red Planet follows a curved trajectory rather than an arrow-straight path.
Work Continues En Route
- The mission team continues to check out spacecraft systems big and small during interplanetary cruise. Perseverance's RIMFAX and MOXIE instruments were tested and determined to be in good shape on Oct. 15. MEDA got a thumbs up on Oct. 19. There was even a line item to check the condition of the X-ray tube in the PIXL instrument on Oct. 16, which also went as planned.
- "If it is part of our spacecraft and electricity runs through it, we want to confirm it is still working properly following launch," said Keith Comeaux, deputy chief engineer for the Mars 2020 Perseverance rover mission. "Between these checkouts - along with charging the rover's and Mars Helicopter's batteries, uploading files and sequences for surface operations, and planning for and executing trajectory correction maneuvers - our plate is full right up to landing."
More About the Mission
- A key objective of Perseverance's mission on Mars is astrobiology, including the search for signs of ancient microbial life. The rover will characterize the planet's geology and past climate, pave the way for human exploration of the Red Planet, and be the first mission to collect and cache Martian rock and regolith (broken rock and dust).
- Subsequent missions, currently under consideration by NASA in cooperation with ESA (European Space Agency), would send spacecraft to Mars to collect these cached samples from the surface and return them to Earth for in-depth analysis.
- The Mars 2020 mission is part of a larger program that includes missions to the Moon as a way to prepare for human exploration of the Red Planet. Charged with returning astronauts to the Moon by 2024, NASA will establish a sustained human presence on and around the Moon by 2028 through NASA's Artemis lunar exploration plans.
• September 28, 2020: Perseverance is one of a few Mars spacecraft carrying laser retroreflectors. The devices could provide new science and safer Mars landings in the future. 29)
- When the Apollo astronauts landed on the Moon, they brought devices with them called retroreflectors, which are essentially small arrays of mirrors. The plan was for scientists on Earth to aim lasers at them and calculate the time it took for the beams to return. This provided exceptionally precise measurements of the Moon's orbit and shape, including how it changed slightly based on Earth's gravitational pull.
- Research with these Apollo-era lunar retroreflectors continues to this day, and scientists want to perform similar experiments on Mars. NASA's Perseverance rover – scheduled to land on the Red Planet on Feb. 18, 2021 – carries the palm-size Laser Retroreflector Array (LaRA). There's also small one aboard the agency's InSight lander, called Laser Retroreflector for InSight (LaRRI). And a retroreflector will be aboard the ESA (European Space Agency) ExoMars rover that launches in 2022.
- While there is currently no laser in the works for this sort of Mars research, the devices are geared toward the future: Reflectors like these could one day enable scientists conducting what is called laser-ranging research to measure the position of a rover on the Martian surface, test Einstein's theory of general relativity, and help make future landings on the Red Planet more precise.
- "Laser retroreflectors are shiny, pointlike position markers," said Simone Dell'Agnello, who led development of all three retroreflectors at Italy's National Institute for Nuclear Physics, which built the devices on behalf of the Italian Space Agency. "Because they're simple and maintenance-free, they can work for decades."
A Box of Mirrors
- The devices work a lot like a bike reflector, bouncing light back in the direction of its source. Perseverance's LaRA, for example, is a 2-inch-wide (5-cm-wide) dome speckled with half-inch holes containing glass cells. In each cell, three mirrored faces are positioned at 90-degree angles from one another so that light entering the holes is directed back out at exactly the same direction it came from.
- LaRA is much smaller than the retroreflectors on the Moon. The earliest ones, delivered by the Apollo 11 and 14 missions, are about the size of typical computer monitor and embedded with 100 reflectors; the ones delivered by Apollo 15 are even larger and embedded with 300 reflectors. That's because the lasers have to travel as much as 478,000 miles (770,000 km) to the Moon and back. By the return trip, the beams are so faint, they can't be detected by the human eye.
- The beams that Perseverance's LaRA and InSight's LaRRI were built to reflect would actually have a far shorter journey, despite Mars being some 249 million miles (401 million km) away at its farthest point from Earth. Rather than traveling back and forth from Earth, which would require enormous retroreflectors, the laser beams would just need to travel back and forth from a future Mars orbiter equipped with an appropriate laser.
Figure 25: Visible both in the inset photograph on the upper left and near the center of NASA's Perseverance Mars rover in this illustration is the palm-size dome called the Laser Retroreflector Array (LaRA). In the distant future, laser-equipped Mars orbiters could use such a reflector for scientific studies ( image credit: NASA/JPL-Caltech)
- Such an orbiter could determine the precise position of a retroreflector on the Martian surface. And since Perseverance will be mobile, it could provide multiple points of reference. Meanwhile, the orbiter's position would also be tracked from Earth. This would allow scientists to test Einstein's theory of general relativity, as they have with retroreflectors on the Moon. Each planet's orbit is greatly influenced by the bend in space-time created by the Sun's large mass.
- "This kind of science is important for understanding how gravity shapes our solar system, the whole universe, and ultimately the roles of dark matter and dark energy," Dell'Agnello noted.
- In the case of the InSight lander, which touched down on Nov. 26, 2018, laser-ranging science could also aid the spacecraft's core mission of studying Mars' deep interior. InSight relies on a radio instrument to detect subtle differences in the planet's rotation. In learning from the instrument how the planet wobbles over time, scientists may finally determine whether Mars' core is liquid or solid.
- And if the science team were able to use the lander's retroreflector, they could get even more precise positioning data than InSight's radio provides. LaRRI could also detect how the terrain InSight sits on shifts over time and in what direction, revealing how the Martian crust expands or contracts.
Better Landings on Mars
- Mars landings are hard. To help get Perseverance safely to the surface, the mission will rely on Terrain-Relative Navigation, a new technology that compares images taken during descent to an onboard map. If the spacecraft sees itself getting too close to danger (like a cliffside or sand dunes), it can veer away.
- But in such a mission-critical event, you can never have too many backups. Future missions barreling toward the surface of the Red Planet could use the series of reference points from laser retroreflectors as a check on the performance of their Terrain Relative Navigation systems – and perhaps even boost their accuracy down to a few centimeters. When the difference between successfully landing near an enticing geological formation or slipping down the steep slope of a crater wall can be measured in mere feet, retroreflectors might be critical.
- "Laser ranging could open up new kinds of Mars exploration," Dell'Agnello said.
• August 13, 2020: NASA's Ingenuity Mars Helicopter received a checkout and recharge of its power system on Friday, August 7, one week into its near seven-month journey to Mars with the Perseverance rover. This marks the first time the helicopter has been powered up and its batteries have been charged in the space environment. 30)
- During the eight-hour operation, the performance of the rotorcraft's six lithium-ion batteries was analyzed as the team brought their charge level up to 35%. The project has determined a low charge state is optimal for battery health during the cruise to Mars.
- "This was a big milestone, as it was our first opportunity to turn on Ingenuity and give its electronics a 'test drive' since we launched on July 30," said Tim Canham, the operations lead for Mars Helicopter at NASA's Jet Propulsion Laboratory in Southern California. "Since everything went by the book, we'll perform the same activity about every two weeks to maintain an acceptable state of charge."
- The 2 kg helicopter - a combination of specially designed components and off-the-shelf parts - is currently stowed on Perseverance's belly and receives its charge from the rover's power supply. Once Ingenuity is deployed on Mars' surface after Perseverance touches down, its batteries will be charged solely by the helicopter's own solar panel. If Ingenuity survives the cold Martian nights during its preflight checkout, the team will proceed with testing.
- "This charge activity shows we have survived launch and that so far we can handle the harsh environment of interplanetary space," said MiMi Aung, the Ingenuity Mars Helicopter project manager at JPL. "We have a lot more firsts to go before we can attempt the first experimental flight test on another planet, but right now we are all feeling very good about the future."
- The small craft will have a 30-Martian-day (31-Earth-day) experimental flight-test window. If it succeeds, Ingenuity will prove that powered, controlled flight by an aircraft can be achieved at Mars, enabling future Mars missions to potentially add an aerial dimension to their explorations with second-generation rotorcraft.
• July 30, 2020: European scientists will help select rocks and soil from Mars in the search for life on our planetary neighbor. 31)
- Five European researchers are part of NASA’s Mars 2020 science team to select the most promising martian samples bound for Earth.
- The mission to Mars launched today for its seven-month journey to the Red Planet. Once there, the team will guide the Perseverance rover as it hunts for evidence of ancient microbial life.
Figure 26: This video shows Jezero crater, the landing site of the NASA Mars 2020 Perseverance rover on the Red Planet, based on images from ESA’s Mars Express mission. The planned landing area is marked with an orange ellipse. The animation was created using an image mosaic made from four single orbit observations obtained by the High Resolution Stereo Camera (HRSC) on Mars Express between 2004 and 2008. The mosaic combines data from the HRSC nadir and color channels; the nadir channel is aligned perpendicular to the surface of Mars, as if looking straight down at the surface. The mosaic image was then combined with topography information from the stereo channels of HRSC to generate a three-dimensional landscape, which was then recorded from different perspectives, as with a movie camera, to render the flight shown in the video. (video credit: ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO ; Music: Björn Schreiner ; Soundtrack logo: Alicia Neesemann)
- The group is made up of researchers from Belgium, France, Sweden and the UK. “These top scientists from across Europe are experts on how to collect, analyze and read the history of the rocks under our feet. Now they will also have to anticipate the needs and challenges of working with martian samples returned to laboratories back on Earth,” says ESA’s Mars Sample Return acting program scientist Gerhard Kminek.
- For the next three years, the team will be at the core of a wider NASA team.
Figure 27: Geological detective Mark Sephton has built his career looking for molecular clues of past life. Organic geochemistry, or the forensic science of organic molecules in rocks, is a passion that this Professor at the Imperial College London in the UK is taking all the way to Mars (image credit: Imperial College London)
- Sandra Siljeström, from Sweden’s research institute RISE, dreams of having the “Bring it to me now!” feeling while remotely analyzing a rock spotted on Mars at the rover landing site – the Jezero crater. Sandra has more than a decade of expertise in organic geochemistry.
Figure 28: Sandra Siljeström in the lab in front of the ToF-SIMS, an spectrometer for surface analysis using a pulsed ion beam (photo: S. Siljeström)
- The area of the Jezero crater contains sediments of an ancient river delta, where evidence of past life could be preserved if it ever existed on the planet.
- Once the Perseverance rover retrieves samples of rock and soil from Mars, it will seal them in canisters and drop them on the surface to be collected by a future retrieval mission.
- “The Mars 2020 mission is the first step for the ultimate martian challenge: the Mars Sample Return campaign. NASA and ESA aim to deliver the material from the martian surface to Earth by 2031,” adds Gerhard.
- To bring Mars samples to Earth, three carefully timed missions are required.
- NASA will deliver the ESA Sample Fetch Rover to the vicinity of the Mars 2020 landing site. This European rover will autonomously track down and collect up to 36 sample tubes deposited by Perseverance, and take them to NASA’s Mars Ascent vehicle.
Figure 29: Overview of the ESA–NASA Mars Sample Return mission. Bringing samples from Mars is the logical next step for robotic exploration and it will require multiple missions that will be more challenging and more advanced than any robotic missions before. Accomplishments in robotic exploration in recent years have increased confidence in success – multiple launches will be necessary to deliver samples from Mars. ESA is working with NASA to explore mission concepts for an international Mars Sample Return campaign between 2020 and 2030. — Three launches will be necessary to accomplish landing, collecting, storing and finding samples and delivering them to Earth. NASA’s Mars 2020 mission will explore the surface and rigorously document and store a set of samples in canisters in strategic areas to be retrieved later for flight to Earth. Two subsequent missions are foreseen to achieve this next step (image credit: ESA, K. Oldenburg)
Sensor complement of the MARS 2020 Rover (MastCam-7, SuperCam, PIXL, SHERLOC, MOXIE, MEDA, RIMFAX)
Scientists will use the Mars 2020 rover to identify and select a collection of rock and soil samples that will be stored for potential return to Earth by a future mission. The Mars 2020 mission is responsive to the science objectives recommended by the National Research Council's 2011 Planetary Science Decadal Survey.
Figure 30: This 2015 diagram shows components of the investigations payload for NASA's Mars2020 rover (image credit: NASA) 34)
MastCam-Z (Mast-mounted Camera system)
Mastcam-Z is an advanced camera system with panoramic and stereoscopic imaging capability with the ability to zoom. The instrument also will determine mineralogy of the Martian surface and assist with rover operations. The principal investigator is James Bell, ASU (Arizona State University) in Tempe. The instrument is based on the successful Mastcam instrument on NASA's Mars Curiosity rover. Mastcam-Z will be the main eyes of NASA's next Mars rover. 35)
From its position on the Mars-2020 Remote Sensing Mast (RSM), the Mastcam-Z imaging investigation acquires visible color (RGB), stereo panoramas of the Martian surface at resolutions sufficient to resolve ~1 mm features in the near-field (robotic arm workspace) and ~3-4 cm features 100 meters away. Mastcam-Z is also equipped with bandpass filters (400 - 1000 nm) that are used to distinguish unweathered from weathered materials and to provide important insights into the mineralogy of many silicates, oxides, oxyhydroxides, and diagnostic hydrated minerals. Mastcam-Z also images the sun directly using a pair of solar filters.
The Mastcam-Z cameras have the capability to zoom, focus, acquire data at high-speed (video rates of 4 frames/sec or faster for subframes), and store large amounts of data in internal storage. These capabilities permit investigators to examine targets that are otherwise out of the rover's reach. The cameras can observe time-dependent phenomena such as dust devils, cloud motions, and astronomical phenomena, as well as activities related to driving, sampling, and caching. Mastcam-Z has improved stereo imaging capabilities compared to the Mars Science Laboratory rover's Mastcam and the Mars Exploration Rovers' Pancam. Mastcam-Z provides important advances in navigational and instrument-placement capabilities that help support and enhance the Mars 2020 rover's driving and coring/sampling capabilities.
Figure 31: MastCam-Z lens packaging (image credit: NASA/JPL Caltech, ASU, MSSS)
Mastcam-Z observes textural, mineralogical, structural, and morphologic details in rocks and fines at the rover's field site. The cameras allow the science team to piece together the geologic history of the site via the stratigraphy of rock outcrops and the regolith, as well as to constrain the types of rocks present (e.g., sedimentary vs. igneous). The Mastcam-Z cameras also document dynamic processes and events via video (e.g., dust devils, cloud motions, and astronomical phenomena, as well as activities related to driving, sampling, and caching), observe the atmosphere, and contribute to rover navigation and target selection for investigations by the coring/caching system, as well as other instruments.
- Objectives: To take high-definition video, panoramic color and 3D images of the Martian surface and features in the atmosphere with a zoom lens to magnify distant targets.
- Location: Mounted on the rover mast at the eye level, 2 meters tall. The cameras are separated by 24.2 cm to provide stereo vision.
- Mass: ~4g
- Power: ~17.4 W
- Volume: Camera head, per unit: 11 x 12 x 26 cm; Digital electronics assembly: 22 x 12 x 5 cm; Calibration target: 10 x 10 x 7 cm.
- Data return: ~ 148 Mbit/sol on average
- Color quality: Similar to that of a consumer digital camera (2-megapixel)
- Image size: 1600 x 1200 pixels max
- Image resolution: Able to resolve between about 150 µm/pixel to 7.4 mm/pixel depending on distance.
SuperCam, an instrument that can provide imaging, chemical composition analysis, and mineralogy. The instrument will also be able to detect the presence of organic compounds in rocks and regolith from a distance. The principal investigator is Roger Wiens, Los Alamos National Laboratory, Los Alamos, New Mexico. This instrument also has a significant contribution from the Centre National d'Etudes Spatiales,Institut de Recherche en Astrophysique et Plane'tologie (CNES/IRAP) France.
SuperCam is a remote-sensing instrument for the Mars 2020 mission that uses remote optical measurements and laser spectroscopy to determine fine-scale mineralogy, chemistry, and atomic and molecular composition of samples encountered on Mars. 36) 37)
To enable these measurements, SuperCam is, in fact, many instruments in one.
• For measurements of elemental composition, it integrates the remote Laser Induced Breakdown Spectroscopy (LIBS) capabilities of the highly successful ChemCam instrument included in the payload of the Curiosity rover currently exploring Mars. LIBS uses a 1064 nm laser to investigate targets up to 7 m distance from the rover.
• In addition, SuperCam also performs Raman spectroscopy (at 532 nm to investigate targets up to 12 m distance from the rover), Time-Resolved Fluorescence (TRF) spectroscopy, Visible and InfraRed (VISIR) reflectance spectroscopy (400 – 900 nm, 1.3 – 2.6 µm) at a distance in order to provide information about the mineralogy and molecular structure of samples under consideration, as well as being able to search directly for organic materials.
• Finally, SuperCam also acquires high-resolution images of samples under study using a color remote micro-imager (RMI). The collection of data provided by this suite of correlated measurements on a sample can be used to determine directly the geochemistry and mineralogy of samples.
SuperCam measurements can be rapidly acquired without the need to position the rover or rover arm upon the target, facilitating rapid and efficient measurements during Mars operations. As demonstrated by ChemCam, the SuperCam laser can be used to "blast off" dust from surfaces at a distance in order to get a better look at solid surfaces on Mars, without having to drive up to samples and perform manipulations with the rover arm or associated tools.
SuperCam is a continuing effort between Los Alamos and the IRAP research institution in Toulouse, France, and the French Space Agency (CNES), with additional collaboration from the University of Hawaii and the University of Valladolid (UVA) in Spain.
- Objectives: To identify the chemical composition of rocks and soils, including their atomic and molecular makeup
- Location: The SuperCam instrument is mounted on the "head" of the rover's long-necked mast.
- Mass: The mast-mounted sensor head has a mass of 5.6 kg, the Rover body-mounted electronics have a mass of 4.8 kg. The calibration target has a mass of 0.2 kg.
- Power: 17.9 W.
- Volume: The volume of the Mast-mounted sensor head is 38 x 24 x 19 cm.
- Calibration target: 3 cm in size.
- Data return: 15.5 Mbit per experiment or about 4.2 Mbit per day.
SuperCam's laser is uniquely capable of remotely clearing away surface dust, giving all of its instruments a clear view of the targets.
Figure 32: Mars 2020's mast, or "head," includes a laser instrument called SuperCam that can vaporize rock material and study the resulting plasma (image credit: NASA/JPL-Caltech)
PIXL (Planetary Instrument for X-ray Lithochemistry)
PIXL is an X-ray fluorescence spectrometer that will also contain an imager with high resolution to determine the fine scale elemental composition of Martian surface materials. PIXL will provide capabilities that permit more detailed detection and analysis of chemical elements than ever before. The principal investigator is Abigail Allwood, NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California. 38)
The PIXL for the Mars-2020 rover is a microfocus X-ray fluorescence instrument that rapidly measures elemental chemistry at sub-millimeter scales by focusing an X-ray beam to a tiny spot on the target rock or soil and analyzing the induced X-ray fluorescence.
Scanning the beam reveals spatial variations in chemistry in relation to fine-scale geologic features such as laminae, grains, cements, veins, and concretions (Figure 33).
The high X-ray flux enables high sensitivity and short integration times: most elements are detected at lower concentrations than possible on previous landed payloads to Mars, and several new elements can be detected that were not previously detectable on these missions. Fast acquisition allows rapid scanning so that PIXL reveals the associations between different elements and the observed textures and structures. The same spectra can be summed for bulk analysis, allowing comparison with bulk chemistry measurements at sites previously explored on Mars. With PIXL’s simple design comes operational efficiency and experimental flexibility—an instrument that can adapt to different scientific opportunities to produce a diverse set of scientifically powerful data products within the constraints of the mission.
Figure 33: PIXL breadboard maps of a paleoarchean altered conglomerate with unconformity surface, revealing complex lithology including rounded pyrite, chromite, zircon, K-Al-Cr clay in the fuchsitic mudstone, Mn,Fe,Ca-carbonate in alteration vein, silicification of the conglomerate matrix. Map size is 20 mm by 10 mm with a step size of 0.15 mm (image credit: NASA/A. Allwood)
The instrument consists of a main electronics unit in the rover’s body and a sensor head mounted on the robotic arm. The sensor head includes an x-ray source, X-ray optics, X-ray detectors, and high-voltage power supply (HVPS), as well as a micro-context camera (MCC) and light-emitting diode (LED). The PIXL can detect elements: Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Br, Rb, Sr, Y, Ga, Ge, As, and Zr, with important trace elements such as Rb, Sr, Y and Zr detectable at 10’s ppm level. An example is shown in Figure 34.
Figure 34: This Figure demonstrates that the PIXL instrument detects important trace elements (red) at 10's ppm. Insert: Rb, Sr, Y, Zr are clearly detected due to the lack of interfering excitation lines at 13-17 keV in PIXL (continuum subtracted using a modeled fit to Bremsstrahlung), image credit: NASA/JPL-Caltech
The advantages of the PIXL instrument are:
• High spatial resolution with a 0.12 mm-diameter beam enabling sub-mm scale geochemistry correlated with texture
• Spatial coverage, targeting and position knowledge: fine step size and micro-context camera will provide resolution and footprint at hand-lens scale
• Fast spectral acquisition: measure most major and minor elements at 0.5 wt% in 5 seconds.
• Large range of detectable elements (26+ elements)
• High sensitivity: detect important trace elements at 10’s ppm level
• Operational efficiency: The combined effect of PIXL’s speed, sensitivity, resolution, coverage/targeting, and measurement flexibility allows PIXL to search efficiently and locate the places of interest and to observe small patches of clean rock
• Operational robustness: tolerant to surface roughness.
- Objectives: To measure the chemical makeup of rocks at a very fine scale
- Location: Mounted on the turret at the end of the robotic arm
- Mass: Arm-mounted sensor head: 4.3 kg; Body-mounted electronics: 2.6 kg; Calibration target: 0.015 kg
- Power: ~25 W
- Volume: Arm-mounted sensor head: 21.5 x 27 x 23 cm
- Calibration targets: Diameter of each of four disks: 5 mm; Pedestal base: 39 x 30 mm
- Data return: About 16 Mbit/experiment or about 2 MB/day.
If you are looking for signs of ancient life, you want to look at a small scale and get detailed information about chemical elements present.
SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics and Chemicals)
SHERLOC is a spectrometer that will provide fine-scale imaging and uses an ultraviolet (UV) laser to determine fine-scale mineralogy and detect organic compounds. SHERLOC will be the first UV Raman spectrometer to fly to the surface of Mars and will provide complementary measurements with other instruments in the payload. The principal investigator is Luther Beegle, NASA/JPL. "Key, driving questions are whether Mars is or was ever inhabited, and if not, why not? The SHERLOC investigation will advance the understanding of Martian geologic history and identify its past biologic potential." 39)
SHERLOC is an arm-mounted, Deep UV (DUV) resonance Raman and fluorescence spectrometer utilizing a 248.6 nm DUV laser and <100 µm spot size. The laser is integrated to an autofocusing/scanning optical system, and co-boresighted to a context imager with a spatial resolution of 30 µm.
SHERLOC enables non-contact, spatially resolved, and highly sensitivity detection and characterization of organics and minerals in the Martian surface and near subsurface. The instrument goals are to assess past aqueous history, detect the presence and preservation of potential biosignatures, and to support selection of return samples. To do this, SHERLOC measures CHNOPS-containing mineralogy, measures the distribution and type of organics preserved at the surface, and correlates them to textural features.
SHERLOC operates over a 7 x 7 mm area through use of an internal scanning mirror. The 500 µm depth of view, in conjunction with the MAHLI heritage autofocus mechanisms, enables arm placements from 48 mm above natural or abraded surfaces without the need for rover arm repositioning/movement. Additionally, borehole interiors, after sample core removal, can be analyzed as a proxy for direct core analysis.
In addition to the combined spectroscopic and macro imaging component, SHERLOC also integrates a “second-eye” with a near-field-to-infinity imaging component called WATSON (Wide Angle Topographic Sensor for Operations and eNgineering), which is used for engineering science operations and science imaging. WATSON is a build-to-print camera based on the MSL (Mars Science Laboratory) Mars Hand Lens Imager (MAHLI). Integration is enabled by existing electronics within SHERLOC.
Deep UV-induced native fluorescence is very sensitive to condensed carbon and aromatic organics, enabling detection at or below 10-6 w/w (1 ppm) at <100 µm spatial scales. SHERLOC's deep UV resonance Raman enables detection and classification of aromatic and aliphatic organics with sensitivities of 10-2 to below 10-4 w/w at <100 µm spatial scales. In addition to organics, the deep UV Raman enables detection and classification of minerals relevant to aqueous chemistry with grain sizes below 20 µm grains.
SHERLOC's investigation combines two spectral phenomena, native fluorescence and pre-resonance/resonance Raman scattering. These events occur when a high-radiance, narrow line-width, laser source illuminates a sample. Organics that fluoresce absorb the incident photon and reemit at a higher wavelength. The difference between the excitation wavelength and the emission wavelength indicates the number of electronic transitions, which increases with increasing aromatic structures (i.e. number of rings). This phenomenon is highly efficient, with a typical cross section 105x greater than Raman scattering, and enables a powerful means to find trace organics.
The native fluorescence emission of organics extends from ~270 nm into the visible. This is especially useful, because it "creates" a fluorescence-free region (from 250 – 270 nm) where Raman scattering can occur. With SHERLOCs narrow-linewidth 248.6 nm DUV laser, additional characterization by Raman scattering from aromatics and aliphatic organics and minerals can be observed. Furthermore, excitation with a DUV wavelength enables resonance and pre-resonance signal enhancements (>100 to 10,000 x) of organic/mineral vibrational bonds by coupling of the incident photon energy to the vibrational energy. This results in high-sensitivity measurements, with low backgrounds, without the need of high-intensity of lasers, and avoids damage or modification of organics by inducing reactions with species such as perchlorates.
SHERLOC Ops: An Example Measurement on Fig Tree
Using the SHERLOC testbed, an analysis of a piece of the astrobiologically interesting chert obtained from the Fig Tree Group is shown.
A context image of the sample is acquired. Using the internal scanning mirror, a 50-micron laser spot is systematically rastered over the surface. On the same CCD, spectra in the range 250-360 nm are obtained. Analysis of the fluorescence region (>270 nm) identifies regions where organic material is present. Analysis of the fluorescence spectra identifies number of aromatic rings present, and identifies regions of high organic content. In order to achieve higher specificity, a longer integration can be used to collect deep UV Raman spectra. The Raman spectra shown on the right are from the two circles shown in the context image.
By studying the fluorescence and Raman data we can conclude that our analysis indicates that:
• The chert has not been altered uniformly — pressure/temperature exposures are evident from carbon maturity variation.
• The majority of matrix is thermally mature carbon — anthracitic to sub-bituminous.
• An intrusion of silica with much younger carbon invaded the main matrix.
Potential for biosignature preservation in the matrix is low due to thermal history of the sample, with high preservation in the thermally unaltered vein material.
- Objective: Fine-scale detection of minerals, organic molecules and potential biosignatures
- Location: SHERLOC is mounted on the turret at the end of the robotic arm
- Mass: The turret is 3.11 kg; the body is 1.61 kg
- Power: The turret consumes 32.2 W, the body 16.6 W
- Volume: 26.0 x 20.0 x 6.7 cm
- Data return: 79.7 Mbit (raw)
- Spatial resolution: Context imager: 30 µm; Laser: 50 µm
- FOV (Field of View): Imaging: 2.3 x 1.5 cm; Spectroscopy: 7 x 7 mm.
Key, driving questions are whether Mars is or was ever inhabited, and if not, why not? The SHERLOC investigation will advance the understanding of Martian geologic history and identify its past biologic potential.
Figure 35: Calibration target for the Mars 2020 SHERLOC instrument (image credit: NASA/Johnson Space Center) 40)
The SHERLOC instrument will be used to detect chemicals on the Martian surface that are linked to the existence of life. To keep the instrument working well, a team from the Astromaterials Research and Exploration Science (ARES) division at NASA’s Johnson Space Center (JSC) recently built a new calibration device for the rover to check SHERLOC’s function and properly tune it during the upcoming mission.
“SHERLOC is pretty complicated, and we came up with a list of 11 things that all have to be calibrated on this instrument,” said Marc Fries, ARES planetary scientist and Mars 2020 instrument co-investigator. “This sophisticated calibration device is also going to be used for a lot of other scientific and engineering investigations, and we’re really excited that it’s JSC’s contribution to the Mars 2020 rover.”
SHERLOC is mounted on the end of the rover's 2.1 m robotic arm and includes a laser, camera and chemical analyzers, called spectrometers. The sensitive components will be used together to search for substances that have been altered by water and possibly reveal evidence of past microscopic life on Mars.
“The rover’s scientific instruments go through all sorts of harsh conditions from the time they leave the lab until they arrive on the surface of Mars. SHERLOC needed a way to make sure it still operates as expected once it’s on the surface and throughout the duration of the mission,” said Trevor Graff, a scientist from Jacobs who works for ARES.
The solution was to create the calibration target, or “cal target” for short. The device is approximately the size of a large cell phone and mounted on the front of the rover. On its face are 10 “targets,” which consist of samples of different materials. The idea is that researchers will occasionally check SHERLOC’s function by directing it to scan the different materials on the cal target. The researchers will already know what the readings on those materials should be when SHERLOC is working correctly. If the actual readings are off, they’ll make adjustments to SHERLOC to get it set properly, or know to compensate for the errors when they analyze the data later.
Figure 36: Image of engineers with the Mars 2020 SHERLOC Calibration Target in a clean room at NASA/JSC (Johnson Space Center). This is the first Mars flight hardware that has been designed, assembled & tested at NASA/JSC, led by Jacobs/JETS Chief Scientist Trevor Graff. It will carry the first space suit materials to Mars and will carry a piece of a martian meteorite back to the surface of Mars (image credit: NASA/JSC) 41)
Science on the Side
In addition to tuning SHERLOC, the targets on the calibration device are serving double duty in other tests and experiments. For example, a number of the targets hold spacesuit materials that could one day be used to protect astronauts exploring Mars. SHERLOC’s scans of those materials will not only help tune the instrument, but measure how the advanced fabrics and other suit materials will hold up in the Martian environment, too.
“We also plan to build a small Mars exposure instrument here at JSC, and match the conditions inside it with weather data from the rover,” Fries said. “We’ll then place an identical set of spacesuit samples inside the chamber and periodically remove them to, for example, test the strength of fabrics or the clarity of helmet visor plastics. The result is we’ll be able to test spacesuit materials in Mars-like conditions long before astronauts ever go there.”
Another target contains an actual sample of a meteorite ejected from Mars long ago and discovered on Earth in 1999. Researchers plan to closely watch the rock sample to see how the Martian environment alters it over time, which will help them understand the chemical interactions between the planet’s surface and its atmosphere.
Finally, the target includes the first off-planet “cache” for geocaching enthusiasts to locate, with more details on that to be released soon.
MOXIE (Mars Oxygen ISRU Experiment)
MOXIE is an exploration technology investigation that will produce oxygen from Martian atmospheric carbon dioxide. The principal investigator is Michael Hecht, MIT (Massachusetts Institute of Technology), Cambridge, Massachusetts.
"When we send humans to Mars, we will want them to return safely, and to do that they need a rocket to lift off the planet. Liquid oxygen propellant is something we could make there and not have to bring with us. One idea would be to bring an empty oxygen tank and fill it up on Mars."
NASA is preparing for human exploration of Mars, and the MOXIE investigation on the Mars 2020 mission aims to address key knowledge gaps, including: 42)
• demonstration of In-Situ Resource Utilization (ISRU) technologies to enable propellant and consumable oxygen production from the Martian atmosphere, and
• characterization of atmospheric dust size and morphology to understand its effects on the operation of surface systems.
MOXIE collects CO2 from the Martian atmosphere, then electrochemically splits the CO2 molecules into O2 and CO. The O2 is then analyzed for purity before being vented back out to the Mars atmosphere along with the CO and other exhaust products.
Figure 37 shows the MOXIE functional block diagram. The CO2 Acquisition and Compression (CAC) system pulls Martian atmosphere from outside the Rover through a filter and pressurizes it to ~1 atmosphere. The pressurized CO2 gas is then regulated and fed to the Solid OXide Electrolyzer (SOXE), where it is electrochemically split at the cathode to produce pure O2 at the anode, a process equivalent to running a fuel cell in reverse.
The SOXE operates at 800° C, requiring a sophisticated thermal isolation system, including input gas preheating and exhaust gas cooling. There are O2 exhaust and CO2/CO exhaust streams, which are then analyzed to verify O2 production rate and purity and for process control. The electrical current through the SOXE is a direct result of the oxide ions transported across the electrolyte, and provides an independent measurement of O2 production rate.
Based on conversion efficiency calculated from flow rates and composition measurements, SOXE control parameters such as CO2 input flow rate, temperature, and applied voltage are used to optimize O2 production under Mars environmental conditions. The cooled exhausts are then filtered to satisfy planetary protection requirements and vented from the Rover. Process telemetry is reported to the Rover for downlink.
- Objective: To produce oxygen from the Martian carbon-dioxide atmosphere
- Power: 300 W
- Volume: 23.9 x 23.9 x 30.9 cm
- Oxygen production rate: About 10 grams per hour
- Operation time: Approximately two hours of oxygen (O2) production per experiment, which will be scheduled intermittently over the duration of the mission.
MEDA (Mars Environmental Dynamics Analyzer)
MEDA is a set of sensors that will provide measurements of temperature, wind speed and direction, pressure, relative humidity and dust size and shape. The principal investigator is Jose Rodriguez-Manfredi, Centro de Astrobiologia, Instituto Nacional de Tecnica Aeroespacial, Spain. 43)
MEDA is a suite of environmental sensors designed to record dust optical properties and six atmospheric parameters: wind speed/direction, pressure, relative humidity, air temperature, ground temperature, and radiation in discrete bands of the UV, visible, and IR ranges of the spectrum.
The radiation sensor is part of an assembly with two arrays of photodiodes that also capture low elevation angle scattered light and a sky-pointing camera; these data are combined to characterize the properties of atmospheric aerosols.
Systematic measurement is the main driver for MEDA operations. Over the entire mission's lifetime, with a configured cadence and frequency in accordance to resource availability, MEDA records data from all sensors. Implementation of this strategy is based on a high degree of autonomy in MEDA operations. MEDA wakes itself up each hour and after recording and storing data, goes to sleep independently of rover operations. It records data whether the rover is awake or not, and both day and night.
The main science objectives for the science team are:
• Signature of the Martian general and mesoscale circulation on phenomena near the surface (e.g., fronts, jets)
• Microscale weather systems (e.g., boundary layer turbulence, heat fluxes, eddies, dust devils)
• Local hydrological cycle (e.g., spatial and temporal variability, diffusive transport from regolith)
• Dust optical properties, photolysis rates, ozone column, and oxidant production.
As an environmental instrument, MEDA's different sensors are in direct contact and exposed to the ambient:
• The radiation/dust sensor assembly is located on top of the rover deck.
• The pressure sensor is located inside the rover body and connected to the atmosphere through a dedicated pipe.
• All other sensors are located around the Remote Sensing Mast (RSM):
- Two wind sensor booms oriented at 120 degrees from each other measure winds approaching the RSM,
- Five sets of thermocouples measure the air temperature
- A thermal infrared sensor measures downward and upward thermal infrared radiation as well as surface skin temperature.
- The relative humidity sensor is also attached to the RSM.
The full set of sensors is controlled by the Instrument Control Unit (ICU) inside the rover body.
A suite of sensors to characterize the Martian low atmosphere and dust properties:
• Air temperature: Located around the RSM are three air temperature sensors (ATS). Two more are on the rover body to ensure that one of them is upwind. Placed on small thermal inertia forks, and outside the rover thermal boundary layers, these five sets of three thermocouples measure atmospheric temperature. The measurement range is 150 to 300 K, with a required accuracy of 5 K and a resolution of 0.1 K.
• Humidity: Located at the RSM inside a protecting cylinder, a humidity sensor (HS) measures the relative humidity with an accuracy of 10% in the 200-323 K range and with a resolution of 1%. A dust filter surrounds the cylinder to protect the sensor from dust deposition.
• Pressure: Located inside the rover body and connected to the external atmosphere via a tube, a pressure sensor (PS) collects pressure measurements. The tube exits the rover body through a small opening with protection against dust deposition. Its measurement range goes from 1 to 1150 Pa with an end-of-life accuracy of 20 Pa (calibration tests give values around 3 Pa) and a resolution of 0.5 Pa. As this component is in contact with the atmosphere, a HEPA filter is placed on the tube inlet to avoid contaminating the Martian environment.
• Radiation & dust: Located on the rover deck, the radiation and dust sensor (RDS) is composed of eight upward looking photodiodes in the following ranges:
- 255 ± 5 nm for the O3 Hartley Band center,
- 295 ± 5 nm for the O3 Hartley Band edge,
- 250-400 nm for total UV,
- 450±40 nm for MastCam-Z cross-calibration,
- 650 ± 25 nm for SuperCam cross-calibration,
- 880 ±5 nm for MastCam-Z cross-calibration,
- 950 ± 50 nm for NIR, and
- one panchromatic (at least 300-1000 nm) filter, with an accuracy better than 8% of the full range for each channel, computed based on Mars radiation levels and minimum dust opacity.
The photodiodes face the zenith direction and have a field of view of 30 degrees except for the panchromatic one with its 180º field of view.
A second array of side-looking photodiodes at 880 nm characterizes the low angle light scattering at different azimuth angles. They cover at least 270º or a circle with fields of view of ±15º and separated about 45º from each other.
A dedicated camera with ±60º around the zenith measures the intensity of the solar aureole.
The assembly of photodiodes and camera are placed on the rover deck without any dust protection. To mitigate dust degradation, magnetic rings are placed around each photodiode with the aim of maximizing their operational time. Nevertheless, to evaluate dust deposition degradation, images of the sensor are recorded periodically, with their readings compared with opacities from other Mars 2020 optical instruments such as MastCam-Z. A comparison of the differences in estimated sky opacities between MEDA and MastCam-Z permits evaluations of the level of dust deposition.
• Thermal radiation: Attached to the RSM and pointing to the front right side of the rover, the thermal infrared sensor (TIRS) measures the net infrared thermal radiation near the surface of Mars with a set of five thermopiles:
- three downward-pointing thermopiles with bands 16-20, 6.5-cut-on and 8-14 µm, and
- two upward-pointing thermopiles with bands 6.5-cut-on and 14.5-15.5 µm.
• Wind: Attached to the RSM, two wind sensors (WS) measure wind speed and direction. These magnitudes are derived based on the information provided by six two-dimensional detectors on each boom. The detectors are located on six boards 60 degrees apart around the boom axis. Each records local speed and direction in the plane of the board. The combination of the 6 boards per boom serves to determine wind speed, as well as pitch and yaw angle of each boom relative to the flow direction.
The requirement is to determine horizontal wind speed with 2 m/s accuracy in the range of 0 to 40 m/s, with a resolution of 0.5 m/s. The directional accuracy is expected to be better than 22.5 degrees. For vertical wind, the range is 0 to 10 m/s, and the accuracy and resolution are the same as for horizontal wind.
The booms hold the detectors out of the RSM's thermal boundary layer, aiming to minimize the wind flow perturbation by the RSM at the boom tip where the these detectors are located. The two booms are separated in azimuth to help ensure that at least one of them will record clean wind data when the other is in the wake of the rover.
To correct for the perturbations at the booms by the RSM and the rover on the environmental temperature and wind field, a variety of numerical analyses and wind tunnel tests are used during calibration under Mars conditions. Numerical simulations are used to obtain results where tests conditions cannot be reproduced on Earth.
- Objectives: To measure weather and monitor dust with sensors from the surface of Mars
- Location: Sensors are located on the rover's mast "neck" and on the deck, front and interior of the rover's body
- Mass: Approximately 5.5 kg for all components
- Power: Up to 17 W, depending on scheduled measurements
a) Air temperature sensors: Each of five sensors is 5.75 x 2.75 x 6.75 cm
b) Radiation and dust sensor: 13.2 x 11.5 x 12.5 cm
c) Relative humidity sensor: 6.25 x 5.75 x 5.75 cm
d) Wind sensors: Wind Sensor 1 is 5 x 17 cm, wind sensor 2 is 5 x 40 cm
e) Instrument control unit and pressure sensor: 14 x 14 x 13 cm
- Data return: Approximately 11 MB.
MEDA will help prepare for human exploration by providing daily weather report and information on the radiation and wind patterns on Mars.
RIMFAX (The Radar Imager for Mars' Subsurface Exploration)
RIMFAX is a ground-penetrating radar that will provide centimeter-scale resolution of the geologic structure of the subsurface. The principal investigator is Svein-Erik Hamran of FFI (Norwegian Defence Research Establishment), Norway.
"No one knows what lies beneath the surface of Mars. Now, we'll finally be able to see what's there."
RIMFAX builds on mature tried-and-true GPR technology used on Earth for a wide variety of scientific and engineering applications, adapted for use in a rover platform on the surface of Mars. Its ultra wideband design, operating from 150 MHz to 1.2 GHz, affords a theoretical limit of 14.2 cm for vertical (range) resolution in free-space. The instrument is composed of an electronics box, installed within the interior of the rover, and a nadir-point antenna affixed to the exterior (rear) of the rover. 44)
RIMFAX will operate as the rover drives and will be commanded to produce individual soundings in different modes, where some modes are for shallow and others are for deep penetration. The default operation will produce interleaved pairs of shallow- and deep-soundings at every 10 cm along a rover traverse. The expectation is for RIMFAX signals to achieve penetrations of 10 m, but it may well exceed that for subsurface conditions that are friendly to the propagation of radar waves.
The overarching goal of RIMFAX is to image the subsurface structure and constrain the nature of the material underlying the landing site. This is made possible because the propagation of radar waves is sensitive to the dielectric properties of materials, such that variations in composition and porosity across geologic strata yield radar reflections that can be identified, mapped, and interpreted in the geological sense.
Specifically, RIMFAX supports and enhances the Mars 2020 investigation in the following, but not limited, ways:
• Assess the depth and extent of regolith;
• Detect different subsurface layers and their relationship to visible surface outcrops;
• Characterize the stratigraphic section from which a cored-and-cached sample derives, including crosscutting relations and features indicative of past environments.
Figure 38: Sample radargram of a glacier in Svalbard obtained with the HUBRA radar instrument, a precursor of RIMFAX built by the FFI team (image credit: NASA, FFI)
Figure 39: Photo showing the prototype RIMFAX antenna attached to a snowmobile during tests in Svalbard, Norway (image credit: NASA/JPL-Caltech, FFI)
- Objective: To see geologic features under the surface with ground-penetrating radar
- Location: The radar antenna is on the lower rear of the rover
- Mass: < 3 kg
- Power: 5-10 W
- Volume: 196 x 120 x 66 mm
- Data return: 5 to 10 kB per sounding location
- Frequency range: 150 to 1200 MHz
- Vertical resolution: As small as about 7.5 - 30 cm thick
- Penetration depth: > 10 m deep depending on materials
- Measurement interval: About every 10 cm along the rover track.
NASA's Mars 2020 mission uses the NASA's Deep Space Network (DSN), an international network of antennas that provides communication links between planetary exploration spacecraft and their mission teams on Earth. 45)
The DSN consists of three deep-space communications complexes placed approximately 120 degrees apart around the world: at Goldstone, in California's Mojave Desert; near Madrid, Spain; and near Canberra, Australia. This strategic placement permits constant links to distant spacecraft even as the Earth rotates on its own axis.
As with previous Mars landers and rovers, the Mars 2020 mission relies on Mars-orbiting spacecraft to relay data from the rover to the antennas of the Deep Space Network.
Figure 40: The Goldstone 70 m antenna tracks under a full moon (image credit: NASA)
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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).