Perseverance (rover) explained

Perseverance
Mission:Mars 2020
Type:Mars rover
Owner:NASA
Manufacturer:Jet Propulsion Laboratory
Dimensions:2.9x
Power:MMRTG
110 watt
Rocket:Atlas V 541
Launched From:Cape Canaveral SLC-41
Deployed From:the Mars 2020 EDLS
Location:18.447°N 77.402°W
Jezero crater, Mars
Travelled: [1]
Programme:NASA Mars rover
Previous:Curiosity

Perseverance, nicknamed Percy,[2] is a car-sized Mars rover designed to explore the Jezero crater on Mars as part of NASA's Mars 2020 mission. It was manufactured by the Jet Propulsion Laboratory and launched on July 30, 2020, at 11:50 UTC.[3] Confirmation that the rover successfully landed on Mars was received on February 18, 2021, at 20:55 UTC.[4] As of, Perseverance has been active on Mars for sols (Earth days, or) since its landing. Following the rover's arrival, NASA named the landing site Octavia E. Butler Landing.[5] [6]

Perseverance has a similar design to its predecessor rover, Curiosity, although it was moderately upgraded. It carries seven primary payload instruments, nineteen cameras, and two microphones.[7]

The rover also carried the mini-helicopter Ingenuity to Mars, an experimental technology testbed that made the first powered aircraft flight on another planet on April 19, 2021.[8] On January 18, 2024 (UTC), it made its 72nd and final flight, suffering damage on landing to its rotor blades, possibly all four, causing NASA to retire it.[9]

The rover's goals include identifying ancient Martian environments capable of supporting life, seeking out evidence of former microbial life existing in those environments, collecting rock and soil samples to store on the Martian surface, and testing oxygen production from the Martian atmosphere to prepare for future crewed missions.

Mission

Despite the high-profile success of the Curiosity rover landing in August 2012, NASA's Mars Exploration Program was in a state of uncertainty in the early 2010s. Budget cuts forced NASA to pull out of a planned collaboration with the European Space Agency which included a rover mission.[10] By the summer of 2012, a program that had been launching a mission to Mars every two years suddenly found itself with no missions approved after 2013.[11]

In 2011, the Planetary Science Decadal Survey, a report from the National Academies of Sciences, Engineering, and Medicine containing an influential set of recommendations made by the planetary science community, stated that the top priority of NASA's planetary exploration program in the decade between 2013 and 2022 should be to begin a NASA-ESA Mars Sample Return campaign, a four-mission project to cache, retrieve, launch, and safely return samples of the Martian surface to Earth. The report stated that NASA should invest in a sample-caching rover as the first step in this effort, with the goal of keeping costs under US$2.5 billion.[12]

After the success of the Curiosity rover and in response to the recommendations of the decadal survey, NASA announced its intent to launch a new Mars rover mission by 2020 at the American Geophysical Union conference in December 2012.[13]

Though initially hesitant to commit to an ambitious sample-caching capability (and subsequent follow-on missions), a NASA-convened science definition team for the Mars 2020 project released a report in July 2013 that the mission should "select and store a compelling suite of samples in a returnable cache."[14]

Science objectives

The Perseverance rover has four main science objectives[15] that support the Mars Exploration Program's science goals:[16]

In the first science campaign Perseverance performs an arching drive southward from its landing site to the Séítah unit to perform a "toe dip" into the unit to collect remote-sensing measurements of geologic targets. After that it will return to the Crater Floor Fractured Rough to collect the first core sample there. Passing by the Octavia E. Butler landing site concludes the first science campaign.

The second campaign will include several months of travel towards the "Three Forks" where Perseverance can access geologic locations at the base of the ancient delta of Neretva river, as well as ascend the delta by driving up a valley wall to the northwest.[18]

Design

The Perseverance design evolved from its predecessor, the Curiosity rover. The two rovers share a similar body plan, landing system, cruise stage, and power system, but the design was improved in several ways for Perseverance. Engineers designed the rover wheels to be more robust than Curiosity wheels, which had sustained some damage.[19] Perseverance has thicker, more durable aluminum wheels, with reduced width and a greater diameter,, than Curiosity wheels.[20] [21] The aluminum wheels are covered with cleats for traction and curved titanium spokes for springy support.[22] The heat shield for the rover was made out of phenolic-impregnated carbon ablator (PICA), to allow it to withstand up to 2400F of heat.[23] Like Curiosity, the rover includes a robotic arm, although Perseverances arm is longer and stronger, measuring . The arm hosts an elaborate rock-coring and sampling mechanism to store geologic samples from the Martian surface in sterile caching tubes.[24] There is also a secondary arm hidden below the rover that helps store the chalk-sized samples. This arm is known as the Sample Handling Assembly (SHA), and is responsible for moving the soil samples to various stations within the Adaptive Caching Assembly (ACA) on the underside of the rover. These stations include volume assessment (measuring the length of sample), imaging, seal dispensing, and hermetic seal station, among others.[25] Owing to the small space in which the SHA must operate, as well as load requirements during sealing activities, the Sample Caching System "is the most complicated, most sophisticated mechanism that we have ever built, tested and readied for spaceflight."[26]

The combination of larger instruments, new sampling and caching system, and modified wheels makes Perseverance heavier, weighing compared to Curiosity at —a 14% increase.[27]

The rover's multi-mission radioisotope thermoelectric generator (MMRTG) has a mass of and uses of plutonium-238 oxide as its power source. The radioactive decay of plutonium-238, which has a half-life of 87.7 years, gives off heat which is converted to electricity—approximately 110 watts at launch.[28] This will decrease over time as its power source decays. The MMRTG charges two lithium-ion rechargeable batteries which power the rover's activities, and must be recharged periodically. Unlike solar panels, the MMRTG provides engineers with significant flexibility in operating the rover's instruments even at night, during dust storms, and through winter.

The rover's computer uses the BAE Systems RAD750 radiation-hardened single board computer based on a ruggedized PowerPC G3 microprocessor (PowerPC 750). The computer contains 128 megabytes of volatile DRAM, and runs at 133 MHz. The flight software runs on the VxWorks operating system, is written in C and is able to access 4 gigabytes of NAND non-volatile memory on a separate card.[29] Perseverance relies on three antennas for telemetry, all of which are relayed through craft currently in orbit around Mars. The primary UHF antenna can send data from the rover at a maximum rate of two megabits per second.[30] Two slower X-band antennas provide communications redundancy.

Instruments

NASA considered nearly 60 proposals[31] [32] for rover instrumentation. On July 31, 2014, NASA announced the seven instruments that would make up the payload for the rover:[33] [34]

There are additional cameras and two audio microphones (the first working microphones on Mars), that will be used for engineering support during landing,[52] driving, and collecting samples.[53] [54] For a full look at Perseverances components see Learn About the Rover.

Mars Ingenuity helicopter experiment

The Ingenuity helicopter, powered by solar-charged batteries, was sent to Mars in the same bundle with Perseverance. With a mass of, the helicopter demonstrated the reality of flight in the rarefied Martian atmosphere and the potential usefulness of aerial scouting for rover missions. It carried two cameras but no scientific instruments[55] [56] [57] and communicated with Earth via a base station onboard Perseverance.[58] Its pre-launch experimental test plan was three flights in 45 days, but it far exceeded expectations and made 72 flights in nearly three years. After its first few flights, it made incrementally more ambitious ones, several of which were recorded by Perseverances cameras. The first flight was April 19, 2021, at 07:15 UTC, with confirmation from data reception at 10:15 UTC.[59] [60] [61] [62] [63] It was the first powered flight by any aircraft on another planet. On January 18, 2024 (UTC), it made its 72nd and final flight, suffering damage to its rotor blades on landing, causing NASA to retire it.[9]

Name

Associate Administrator of NASA's Science Mission Directorate, Thomas Zurbuchen selected the name Perseverance following a nationwide K-12 student "name the rover" contest that attracted more than 28,000 proposals. A seventh-grade student, Alexander Mather from Lake Braddock Secondary School in Burke, Virginia, submitted the winning entry at the Jet Propulsion Laboratory. In addition to the honor of naming the rover, Mather and his family were invited to NASA's Kennedy Space Center to watch the rover's July 2020 launch from Cape Canaveral Air Force Station (CCAFS) in Florida.

Mather wrote in his winning essay:

Curiosity. InSight. Spirit. Opportunity. If you think about it, all of these names of past Mars rovers are qualities we possess as humans. We are always curious, and seek opportunity. We have the spirit and insight to explore the Moon, Mars, and beyond. But, if rovers are to be the qualities of us as a race, we missed the most important thing. Perseverance. We as humans evolved as creatures who could learn to adapt to any situation, no matter how harsh. We are a species of explorers, and we will meet many setbacks on the way to Mars. However, we can persevere. We, not as a nation but as humans, will not give up. The human race will always persevere into the future.[64]

Twin rover

JPL built a copy of the Perseverance; a twin rover used for testing and problem solving, OPTIMISM (Operational Perseverance Twin for Integration of Mechanisms and Instruments Sent to Mars), a vehicle system test bed (VSTB). It is housed at the JPL Mars Yard and is used to test operational procedures and to aid in problem solving should any issues arise with Perseverance.[65]

Operational history

Mars transit

The Perseverance rover lifted off successfully on July 30, 2020, at 11:50:00 UTC aboard a United Launch Alliance Atlas V launch vehicle from Space Launch Complex 41, at Cape Canaveral Air Force Station (CCAFS) in Florida.[66]

The rover took 29 weeks to travel to Mars and made its landing in Jezero Crater on February 18, 2021, to begin its science phase.[67]

After May 17, 2022, the rover will move uphill and examine rocks on the surface for evidence of past life on Mars. On its return downhill, it will collect sample rocks to be retrieved and examined by future expeditions.[68]

Landing

The successful landing of Perseverance in Jezero Crater was announced at 20:55 UTC on February 18, 2021,[69] the signal from Mars taking 11 minutes to arrive at Earth. The rover touched down at 18.4446°N 77.4509°W,[70] roughly southeast of the center of its 7.7x[71] wide landing ellipse. It came down pointed almost directly to the southeast,[72] with the RTG on the back of the vehicle pointing northwest. The descent stage ("sky crane"), parachute and heat shield all came to rest within 1.5 km of the rover (see satellite image). Having come within sixteen feet (~5 meters) of its target, the landing was more accurate than any previous Mars landing; a feat enabled by the experience gained from Curiositys landing and the use of new steering technology.

One such new technology is Terrain Relative Navigation (TRN), a technique in which the rover compares images of the surface taken during its descent with reference maps, allowing it to make last minute adjustments to its course. The rover also uses the images to select a safe landing site at the last minute, allowing it to land in relatively unhazardous terrain. This enables it to land much closer to its science objectives than previous missions, which all had to use a landing ellipse devoid of hazards.

The landing occurred in the late afternoon, with the first images taken at 15:53:58 on the mission clock (local mean solar time).[73] The landing took place shortly after Mars passed through its northern vernal equinox (Ls = 5.2°), at the start of the astronomical spring, the equivalent of the end of March on Earth.[74]

The parachute descent of the Perseverance rover was photographed by the HiRISE high-resolution camera on the Mars Reconnaissance Orbiter (MRO).[75]

Jezero Crater is a paleolake basin.[76] [77] It was selected as the landing site for this mission in part because paleolake basins tend to contain perchlorates. Astrobiologist Dr. Kennda Lynch's work in analog environments on Earth suggests that the composition of the crater, including the bottomset deposits accumulated from three different sources in the area, is a likely place to discover evidence of perchlorate-reducing microbes, if such bacteria are living or were formerly living on Mars.

A few days after landing, Perseverance released the first audio recorded on the surface of Mars, capturing the sound of Martian wind.[78] [79]

During its travels on Mars, NASA scientists had observed around Sol 341 (February 4, 2022) that a small rock had dropped into one of its wheels while the rover was studying the Máaz rock formation. The rock was visible from one of the hazard avoidance cameras, and was determined not to be harmful to the rover's mission. The rock has since stayed on Perseverances wheels for at least 123 sols (126 days) as the rover traveled over 5miles on the surface. NASA deemed that Perseverance had adopted a pet rock for its journey.[80] [81]

Traverse

It is planned for Perseverance to visit the bottom and upper parts of the 3.4 to 3.8 billion-year-old Neretva Vallis delta, the smooth and etched parts of the Jezero Crater floor deposits interpreted as volcanic ash or aeolian airfall deposits, emplaced before the formation of the delta; the ancient shoreline covered with Transverse Aeolian Ridges (dunes) and mass wasting deposits, and finally, it is planned to climb onto the Jezero Crater rim.[82]

In its progressive commissioning and tests, Perseverance made its first test drive on Mars on March 4, 2021. NASA released photographs of the rover's first wheel tracks on the Martian soil.[83]

Samples cached for the Mars sample-return mission

In support of the NASA-ESA Mars Sample Return, rock, regolith (Martian soil), and atmosphere samples are being cached by Perseverance. As of October 2023, 27 out of 43 sample tubes have been filled,[84] including 8 igneous rock samples, 12 sedimentary rock sample tubes, a Silica-cemented carbonate rock sample tube,[85] two regolith sample tubes, an atmosphere sample tube,[86] and three witness tubes.[87] Before launch, 5 of the 43 tubes were designated "witness tubes" and filled with materials that would capture particulates in the ambient environment of Mars. Out of 43 tubes, 3 witness sample tubes will not be returned to Earth and will remain on rover as the sample canister will only have 30 tube slots. Further, 10 of the 43 tubes are left as backups at the Three Forks Sample Depot.[88]

Discoveries

In July 2024, NASA’s Perseverance rover discovered “leopard spots” on a reddish rock nicknamed “Cheyava Falls” in Mars’ Jezero Crater, that has some indications it may have hosted microbial life billions of years ago, but further research is needed.[89] [90]

Cost

NASA plans to invest roughly US$2.75 billion in the project over 11 years, including US$2.2 billion for the development and building of the hardware, US$243 million for launch services, and US$291 million for 2.5 years of mission operations.[91]

Adjusted for inflation, Perseverance is NASA's sixth-most expensive robotic planetary mission, though it is cheaper than its predecessor, Curiosity.[92] Perseverance benefited from spare hardware and "build-to print" designs from the Curiosity mission, which helped reduce development costs and saved "probably tens of millions, if not 100 million dollars" according to Mars 2020 Deputy Chief Engineer Keith Comeaux.[93]

Commemorative artifacts

"Send Your Name to Mars"

NASA's "Send Your Name to Mars" campaign invited people from around the world to submit their names to travel aboard the agency's next rover to Mars. 10,932,295 names were submitted. The names were etched by an electron beam onto three fingernail-sized silicon chips, along with the essays of the 155 finalists in NASA's "Name the Rover" contest. The three chips share space on an anodized plate with a laser engraved graphic representing Earth, Mars, and the Sun. The rays emanating from the Sun contain the phrase "Explore As One" written in Morse code.[94] The plate was then mounted on the rover on March 26, 2020.[95]

Geocaching in Space Trackable

Part of Perseverances cargo is a geocaching trackable item viewable with the SHERLOC's WATSON camera.[96]

In 2016, NASA SHERLOC co-investigator Dr. Marc Fries — with help from his son Wyatt — was inspired by Geocaching's 2008 placement of a cache on the International Space Station to set out and try something similar with the rover mission. After floating the idea around mission management, it eventually reached NASA scientist Francis McCubbin, who would join the SHERLOC instrument team as a collaborator to move the project forward. The Geocaching inclusion was scaled-down to a trackable item that players could search for from NASA camera views and then log on to the site.[97] In a manner similar to the "Send Your Name to Mars" campaign, the geocaching trackable code was carefully printed on a one-inch, polycarbonate glass disk serving as part of the rover's calibration target. It will serve as an optical target for the WATSON imager and a spectroscopic standard for the SHERLOC instrument. The disk is made of a prototype astronaut helmet visor material that will be tested for its potential use in crewed missions to Mars. Designs were approved by the mission leads at NASA's Jet Propulsion Laboratory (JPL), NASA Public Affairs, and NASA HQ, in addition to Groundspeak Geocaching HQ.[98] [99]

Tribute to healthcare workers

Perseverance launched during the COVID-19 pandemic, which began to affect the mission planning in March 2020. To show appreciation for healthcare workers who helped during the pandemic, an plate with a staff-and-serpent symbol (a Greek symbol of medicine) was placed on the rover. The project manager, Matt Wallace, said he hoped that future generations going to Mars would be able to appreciate healthcare workers during 2020.[100]

Family portrait of NASA Mars rovers

One of the external plates of Perseverance includes a simplified representation of all previous NASA Martian rovers, Sojourner, Spirit, Opportunity, Curiosity, as well as Perseverance and Ingenuity, similar to the trend of automobile window decals used to show a family's makeup.[101]

Parachute with coded message

The orange-and-white parachute used to land the rover on Mars contained a coded message that was deciphered by Twitter users. NASA's systems engineer Ian Clark used binary code to hide the message "dare mighty things" in the parachute color pattern. The 70adj=midNaNadj=mid parachute consisted of 80 strips of fabric that form a hemisphere-shape canopy, and each strip consisted of four pieces. Dr. Clark thus had 320 pieces with which to encode the message. He also included the GPS coordinates for the Jet Propulsion Laboratory's headquarters in Pasadena, California (34°11’58” N 118°10’31” W). Clark said that only six people knew about the message before landing. The code was deciphered a few hours after the image was presented by Perseverances team.[102] [103] [104]

"Dare mighty things" is a quote attributed to U.S. president Theodore Roosevelt and is the unofficial motto of the Jet Propulsion Laboratory.[105] It adorns many of the JPL center's walls.

NASA outreach to students

In December 2021, the NASA team announced a program to students who have persevered with academic challenges. Those nominated will be rewarded with a personal message beamed back from Mars by the Perseverance rover.

Gallery

March 5, 2024: NASA released images of transits of the moon Deimos, the moon Phobos and the planet Mercury as viewed by the Perseverance rover on the planet Mars.

See also

External links

Notes and References

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