Spirit
Mission type
Rover
Operator
NASA
COSPAR ID 2003-027A
Website
JPL's Mars Exploration Rover
Mission duration
Planned: 90 Martian solar days (~92 Earth days)Script error: The function "age_generic" does not exist. sols )Script error: The function "age_generic" does not exist. sols )Script error: The function "age_generic" does not exist. sols )
Spacecraft properties
Spacecraft type
Mars Exploration Rover
Dry mass
185 kilograms (408 lb) (Rover only)
Start of mission
Launch date
June 10, 2003 (2003-06-10 ) [1] [2]
Rocket
Delta II 7925-9.5[2] [3]
Launch site
Cape Canaveral SLC-17A
End of mission
Last contact
22 March 2010; 25 May 2011 (2011-05-26 ) [1]
Orbital parameters
Reference system
Heliocentric (transfer)
Mars rover
Spacecraft component
Rover
Landing date
January 4, 2004, 04:35 UTC SCET MSD 46216 03:35 AMT
Landing site
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Distance covered
7.73 km (4.8 mi)
File:Nasa mer marvin.png The launch patch for Spirit Marvin the Martian
Spirit MER-A (Mars Exploration Rover – A ) or MER-2 , is a robotic rover on Mars , active from 2004 to 2010.[1] rovers of NASA 's ongoing Mars Exploration Rover Mission. It landed successfully on Mars at 04:35 Ground UTC on January 4, 2004, three weeks before its twin, Opportunity NASA-sponsored student essay competition . The rover became stuck in late 2009, and its last communication with Earth was sent on March 22, 2010.
The rover completed its planned 90-sol mission. Aided by cleaning events that resulted in more energy from its solar panels, Spirit went on to function effectively over twenty times longer than NASA planners expected. Spirit also logged 7.73 km (4.8 mi) of driving instead of the planned 600 m (0.4 mi),[5] sol prime mission) were published in a special issue of the journal Science [6]
On May 1, 2009 (5 years, 3 months, 27 Earth days after landing; 21.6 times the planned mission duration), Spirit became stuck in soft soil.[7] NASA carefully analyzed the situation, running Earth-based theoretical and practical simulations, and finally programming the rover to make extrication drives in an attempt to free itself. These efforts continued until January 26, 2010 when NASA officials announced that the rover was likely irrecoverably obstructed by its location in soft soil,[8] [9]
The rover continued in a stationary science platform role until communication with Spirit stopped on sol 2210 (March 22, 2010).[10] [11] [12] [13] [14] [15] Memorial Day holiday and was televised on NASA TV .
The Jet Propulsion Laboratory (JPL), a division of the California Institute of Technology in Pasadena, manages the Mars Exploration Rover project for NASA's Office of Space Science, Washington.
Objectives
Delta II Heavy lifting off with MER-A on June 10, 2003
The scientific objectives of the Mars Exploration Rover mission were to:[16]
Search for and characterize a variety of rocks and soils that hold clues to past water activity. In particular, samples sought will include those that have minerals deposited by water-related processes such as precipitation , evaporation , sedimentary cementation or hydrothermal activity .
Determine the distribution and composition of minerals, rocks, and soils surrounding the landing sites.
Determine what geologic processes have shaped the local terrain and influenced the chemistry. Such processes could include water or wind erosion, sedimentation, hydrothermal mechanisms, volcanism, and cratering.
Perform calibration and validation of surface observations made by Mars Reconnaissance Orbiter instruments. This will help determine the accuracy and effectiveness of various instruments that survey Martian geology from orbit.
Search for iron-containing minerals, identify and quantify relative amounts of specific mineral types that contain water or were formed in water, such as iron-bearing carbonates.
Characterize the mineralogy and textures of rocks and soils and determine the processes that created them.
Search for geological clues to the environmental conditions that existed when liquid water was present.
Assess whether those environments were conducive to life.
NASA sought evidence of life on Mars, beginning with the question of whether the Martian environment was ever suitable for life. Life forms known to science require water, so the history of water on Mars is a critical piece of knowledge. Although the Mars Exploration Rovers did not have the ability to detect life directly, they offered very important information on the habitability of the environment during the planet's history.
Design and construction
Spirit rover images its lander on the surface of Mars on January 18/19, 2004 (
Spirit Sol 16)
[17]
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Spirit (and its twin, Opportunity solar-powered robots standing 1.5 meters (4.9 ft) high, 2.3 meters (7.5 ft) wide and 1.6 meters (5.2 ft) long and weighing 180 kilograms (400 lb). Six wheels on a rocker-bogie system enable mobility over rough terrain. Each wheel has its own motor. The vehicle is steered at front and rear and is designed to operate safely at tilts of up to 30 degrees. Maximum speed is 5 centimetres per second (2.0 in/s);[18] Spirit and Opportunity have pieces of the fallen World Trade Center 's metal on them that were "turned into shields to protect cables on the drilling mechanisms".[19] [20]
Solar arrays generate about 140 watts for up to four hours per Martian day (sol) while rechargeable lithium ion batteries store energy for use at night. Spirit's onboard computer uses a 20 MHz RAD6000 CPU with 128 MB of DRAM, 3 MB of EEPROM, and 256 MB of flash memory. The rover's operating temperature ranges from −40 to +40 °C (−40 to 104 °F) and radioisotope heater units provide a base level of heating, assisted by electrical heaters when necessary. A gold film and a layer of silica aerogel provide insulation.
Communications depends on an omnidirectional low-gain antenna communicating at a low data rate and a steerable high-gain antenna, both in direct contact with Earth. A low gain antenna is also used to relay data to spacecraft orbiting Mars.
Fixed science instruments include
The rover arm holds the following instruments
Mössbauer spectrometer (MB) MIMOS II – used for close-up investigations of the mineralogy of iron-bearing rocks and soils.Alpha particle X-ray spectrometer (APXS) – close-up analysis of the abundances of elements that make up rocks and soils.Magnets – for collecting magnetic dust particles.
Microscopic Imager (MI) – obtains close-up, high-resolution images of rocks and soils.
Rock Abrasion Tool (RAT) – exposes fresh material for examination by instruments on board.
The cameras produce 1024-pixel by 1024-pixel images, the data is compressed, stored, and transmitted later.
Mission overview
Spirit landing site, as imaged by
MRO (December 4, 2006); click image to enlarge
An overall view of MER-A
Spirit landing site (denoted with a star)
The primary surface mission for Spirit was planned to last at least 90 sols . The mission received several extensions and lasted about 2,208 sols. On August 11, 2007, Spirit obtained the second longest operational duration on the surface of Mars for a lander or rover at 1282 Sols, one sol longer than the Viking 2 lander. Viking 2 was powered by a nuclear cell whereas Spirit is powered by solar arrays. Until Opportunity overtook it on May 19, 2010, the Mars probe with longest operational period was Viking 1 that lasted for 2245 Sols on the surface of Mars. On March 22, 2010, Spirit sent its last communication, thus falling just over a month short of surpassing Viking 1's operational record. An archive of weekly updates on the rover's status can be found at the Spirit Update Archive.[21]
Spirit's total odometry as of March 22, 2010 (sol 2210) is 7,730.50 meters (4.80 mi).[22]
Mission timeline 2004 The Spirit Mars rover and lander arrived successfully on the surface of Mars on 04:35 Ground UTC on January 4, 2004. This was the start of its 90-sol mission, but solar cell cleaning events would mean it was the start of a much longer mission, lasting until 2010.
Landing site: Columbia Memorial Station
Annotated Columbia Hills panorama from the
Spirit landing site
Spirit was targeted to a site that appears to have been affected by liquid water in the past, the crater Gusev , a possible former lake in a giant impact crater about 10 km (6.2 mi) from the center of the target ellipse[23] Lua error in package.lua at line 80: module 'strict' not found. [24]
After the airbag-protected landing craft settled onto the surface, the rover rolled out to take panoramic images. These give scientists the information they need to select promising geological targets and drive to those locations to perform on-site scientific investigations. The panoramic image below shows a slightly rolling surface, littered with small rocks, with hills on the horizon up to 3 kilometers (1.9 mi) away.[25] astronauts killed in the Space Shuttle Columbia disaster .
"Sleepy Hollow ," a shallow depression in the Mars ground at the right side of the above picture, was targeted as an early destination when the rover drove off its lander platform. NASA scientists were very interested in this crater. It is 9 meters (30 ft) across and about 12 meters (39 ft) north of the lander.
First color image
First color image compiled from images by
Spirit ; it was the highest resolution color image taken on another planet.
To the right is the first color image derived from images taken by the panoramic camera on the Mars Exploration Rover Spirit . It was the highest resolution image taken on the surface of another planet. According to the camera designer Jim Bell of Cornell University , the panoramic mosaic consists of four pancam images high by three wide. The picture shown originally had a full size of 4,000 by 3,000 pixels. However, a complete pancam panorama is even 8 times larger than that, and could be taken in stereo (i.e., two complete pictures, making the resolution twice as large again.) The colors are fairly accurate. (For a technical explanation, see colors outside the range of the human eye .)
The MER pancams are black-and-white instruments. Thirteen rotating filter wheels produce multiple images of the same scene at different wavelengths. Once received on Earth, these images can be combined to produce color images.[26]
Sol 17 (January 21, 2004) flash memory management anomaly On January 21, 2004 (sol 17), Spirit abruptly ceased communicating with mission control. The next day the rover radioed a 7.8 bit/s beep, confirming that it had received a transmission from Earth but indicating that the craft believed it was in a fault mode. Commands would only be responded to intermittently. This was described as a very serious anomaly, but potentially recoverable if it were a software or memory corruption issue rather than a serious hardware failure. Spirit was commanded to transmit engineering data, and on January 23 sent several short low-bitrate messages before finally transmitting 73 megabits via X band to Mars Odyssey ") to try to cause it to suspend itself until a given time. It seemingly ignored the command.
The leading theory at the time was that the rover was stuck in a "reboot loop". The rover was programmed to reboot if there was a fault aboard. However, if there was a fault that occurred during reboot, it would continue to reboot forever. The fact that the problem persisted through reboot suggested that the error was not in RAM, but in either the flash memory , the EEPROM , or a hardware fault. The last case would likely doom the rover. Anticipating the potential for errors in the flash memory and EEPROM, the designers had made it so that the rover could be booted without ever touching the flash memory. The radio itself could decode a limited command set – enough to tell the rover to reboot without using flash. Without access to flash memory the reboot cycle was broken.
On sol 19 (January 24, 2004) the rover repair team announced that the problem was with Spirit' s flash memory and the software that wrote to it. The flash hardware was believed to be working correctly but the file management module in the software was "not robust enough" for the operations the Spirit was engaged in when the problem occurred, indicating that the problem was caused by a software bug as opposed to faulty hardware. NASA engineers finally came to the conclusion that there were too many files on the file system, which was a relatively minor problem. Most of these files contained unneeded in-flight data. After realizing what the problem was, the engineers deleted some files, and eventually reformatted the entire flash memory system. On February 6 (sol 33), the rover was restored to its original working condition, and science activities resumed.[27]
First intentional grinding of a rock on Mars Digital camera (the Pancam ) image of a Mars rock (called Adirondack ) taken after a RAT grind (the rock grinding tool) The round, shallow depression in this image resulted from the first intentional grinding of a rock on Mars. The Rock Abrasion Tool (aka "RAT") on NASA's Spirit rover ground off the surface of a patch 45.5 millimeters (1.79 in) in diameter on a rock called Adirondack during sol 32 (February 6, 2004). The hole is 2.65 millimeters (0.104 in) deep, exposing fresh interior material of the rock for close inspection with the rover's microscopic imager and two spectrometers on the robotic arm. This image was taken by Spirit' s panoramic camera, providing a quick visual check of the success of the grinding.
"The RAT performed beyond our expectations," beamed Steve Gorevan, of Honeybee Robotics, New York, lead scientist for the rock abrasion tools on both rovers. "With the docile cutting parameters we set, I didn't think that it would cut this deep. In fact, when we saw virtually a complete circle, I was thrilled beyond anything I could have ever dreamed. Following up that glorious circular brushing – it's like back-to-back homers."
This color image taken by the Mars Exploration Rover Spirit' s panoramic camera on sol 39 (February 13, 2004) is centered on an unusually flaky rock called Mimi. Mimi is only one of many features in the area known as "Stone Council", but looks very different from any rock that scientists have seen at the Gusev crater site so far. Mimi's flaky appearance leads scientists to a number of hypotheses. Mimi could have been subjected to pressure either through burial or impact, or may have once been a dune that was cemented into flaky layers, a process that sometimes involves the action of water.
Humphrey rock On March 5, 2004, NASA announced that Spirit had found hints of water history on Mars in a rock dubbed "Humphrey". Raymond Arvidson , the McDonnell University Professor and chair of Earth and Planetary Sciences at Washington University in St. Louis , reported during a NASA press conference: "If we found this rock on Earth, we would say it is a volcanic rock that had a little fluid moving through it." In contrast to the rocks found by the twin rover Opportunity , this one was formed from magma and then acquired bright material in small crevices, which look like crystallized minerals. If this interpretation holds true, the minerals were most likely dissolved in water, which was either carried inside the rock or interacted with it at a later stage, after it formed.[28]
Bonneville crater On sol 65 March 11, 2004, Spirit reached Bonneville crater after a 400-yard (370 m) journey.[citation needed This crater is about 200 meters (220 yd) across with a floor about 10 meters (11 yd) below the surface.[29] Spirit drove along the southern rim and continued to the southwest towards the Columbia Hills.
Spirit reached Missoula crater on sol 105. The crater is roughly 100 yards (91 m) across and 20 yards (18 m) deep. Missoula crater was not considered a high priority target due to the older rocks it contained. The rover skirted the northern rim, and continued to the southeast. It then reached Lahontan crater on sol 118, and drove along the rim until sol 120. Lahontan is about 60 yards (55 m) across and about 10 yards (9.1 m) deep. A long, snaking sand dune stretches away from its southwestern side, and Spirit went around it, because loose sand dunes present an unknown risk to the ability of the rover wheels to get traction.
Columbia Hills Spirit drove from Bonneville crater in a direct line to the Columbia Hills. The route was only specified from the engineers, if the terrain was difficult to drive. Usually the rover drove in an autonomous mode. On sol 159, Spirit reached the first of many targets at the base of the Columbia Hills called West Spur. Hank's Hollow was studied for 23 sols. Within Hank's Hollow was the strange-looking rock dubbed "Pot of Gold ". Analysing this rock was difficult for Spirit, because it lay in a slippery area. After a detailed analysis with the AXPS-and the Mößbauer instrument it was detected that it contains hematite.[30]
As the produced energy from the solar panels was lowering due to the setting sun and dust the Deep Sleep Mode was introduced. In this mode the rover was shut down completely during the night in order to save energy, even if the instruments would fail.[31]
From here, Spirit took a northerly path along the base of the hill towards the target Wooly Patch, which was studied from sol 192 to sol 199. By sol 203, Spirit had driven southward up the hill and arrived at the rock dubbed "Clovis". Clovis was ground and analyzed from sol 210 to sol 225. Following Clovis came the targets of Ebenezer (Sols 226–235), Tetl (sol 270), Uchben and Palinque (Sols 281–295), and Lutefisk (Sols 296–303). From Sols 239 to 262, Spirit powered down for solar conjunction , when communications with the Earth are blocked. Slowly, Spirit made its way around the summit of Husband Hill, and at sol 344 was ready to climb over the newly designated "Cumberland Ridge" and into "Larry's Lookout " and "Tennessee Valley". Spirit also did some communication tests with the ESA orbiter Mars Express Mars Odyssey Mars Global Surveyor
2005 Driving up to Husband Hill Spirit had now been on Mars for one Earth year and was driving slowly uphill towards the top of Husband Hill. This was difficult because there were many rocky obstacles and sandy parts. This lead frequently to a slippage and the route could not be driven as planned. In February Spirit' s computer received a software update in order to drive more autonomously.[32] Spirit arrived at a rock named "Peace" near the top of Cumberland Ridge. Spirit ground Peace with the RAT on sol 373. By sol 390 (mid-February 2005), Spirit was advancing towards "Larry's Lookout", by driving up the hill in reverse. The scientists at this time were trying to conserve as much energy as possible for the climb.
Spirit also investigated some targets along the way, including the soil target, "Paso Robles", which contained the highest amount of salt found on the red planet. The soil also contained a high amount of phosphorus in its composition, however not nearly as high as another rock sampled by Spirit , "Wishstone". Squyres said of the discovery, "We're still trying to work out what this means, but clearly, with this much salt around, water had a hand here".
Spirit' s traverse up Husband Hill
Spirit artificially added to image (taken by itself) of Larry's Lookout
Martian sunset by Spirit at Gusev crater, May 19, 2005.
Dust whirlwinds On March 9, 2005 (probably during the Martian night), the rover's solar panel efficiency jumped from around 60% of what it had originally been to 93%, followed on March 10, by the sighting of dust devils . NASA scientists speculate a dust devil must have swept the solar panels clean, possibly significantly extending the duration of the mission. This also marks the first time dust devils had been spotted by either Spirit or Opportunity , easily one of the top highlights of the mission to date. Dust devils had previously been photographed by only the Pathfinder
Mission members monitoring Spirit on Mars reported on sol 421 March 12, 2005, that a lucky encounter with a dust devil had cleaned the robot's solar panels. Energy levels dramatically increased and daily science work was anticipated to be expanded.[33]
Video of a dust devil on Mars, photographed by Spirit . The counter in the bottom-left corner indicates time in seconds after the first photo was taken in the sequence. At the final frames, one can see that the dust devil has left a trail on the Martian surface. Three other dust devils also appear in the background.
Husband Hill summit As of August Spirit was only 100 meters away from the top. Here it was found that Husband Hill has two summits, with one a little higher than the other. On September 29, the 618th sol Spirit reached the real summit of Husband Hill. The rover was the first spacecraft to climb atop a mountain on another planet. The whole distance driven totaled 4971 meters. The summit itself was flat. Spirit took a 360 degree panorama in real color, which included the whole Gusev crater. At night the rover observed the moons Phobos and Deimos in order to determine their orbits better.[34] Spirit surveyed the Mars sky and the opacity of the atmosphere with its pancam to make a coordinated science campaign with the Hubble Space Telescope in Earth orbit.[35]
From the peak Spirit spotted a striking formation, which was dubbed Home Plate . This was an interesting target, but Spirit would be driven later to the McCool Hill to tilt its solar panels towards the sun in the coming winter. At the end of October the rover was driven downhill and to Home Plate . On the way down Spirit reached the rock formation name Comanche on sol 690. Scientists used data from all three spectrometers to find out that about one-fourth of the composition of Comanche is magnesium iron carbonate. That concentration is 10 times higher than for any previously identified carbonate in a Martian rock. Carbonates originate in wet, near-neutral conditions but dissolve in acid. The find at Comanche is the first unambiguous evidence from the Mars Exploration Mission rovers for a past Martian environment that may have been more favorable to life than the wet but acidic conditions indicated by the rovers' earlier finds.[36]
View from the Summit taken by Spirit on August 23, 2005, as the rover completed the climb up "Husband Hill". 2006 Driving to McCool Hill In 2006 Spirit drove towards an area dubbed "Home Plate", and reached it in February. For events in 2006 by NASA see NASA Spirit Archive 2006
Spirit's next stop was originally planned to be the north face of McCool Hill , where Spirit would receive adequate sunlight during the Martian winter. On March 16, 2006 JPL announced that Spirit's troublesome front wheel had stopped working altogether. Despite this, Spirit was still making progress toward McCool Hill because the control team programmed the rover to drive toward McCool Hill backwards, dragging its broken wheel.[37] Spirit encountered loose soil that was impeding its progress toward McCool Hill. A decision was made to terminate attempts to reach McCool Hill and instead park on a nearby ridge named Low Ridge Haven.
Curious rock near edge of "Home Plate" with a jutting portion. (Animated GIF image for stereoscopic perception.)
Spirit arrived at the north west corner of Home Plate , a raised and layered outcrop on sol 744 (February 2006) after an effort to maximize driving. Scientific observations were conducted with Spirit's robotic arm.
Low Ridge Haven Possible meteorites found at Low Ridge Reaching the ridge on April 9, 2006 and parking on the ridge with an 11° incline to the north, Spirit spent the next eight months on the ridge, spending that time undertaking observations of changes in the surrounding area.[38]
While at Low Ridge, Spirit imaged two rocks of similar chemical nature to that of Opportunity' s Heat Shield Rock , a meteorite on the surface of Mars. Named "Zhong Shan" for Sun Yat-sen and "Allan Hills" for the location in Antarctica where several Martian meteorites have been found, they stood out against the background rocks that were darker. Further spectrographic testing is being done to determine the exact composition of these rocks, which may turn out to also be meteorites.
2007 Software upgrade On sol 1067, January 4, 2007, both rovers received new flight software to the onboard computers. The update was received just in time for the third anniversary of their landing. The new systems let the rovers decide whether or not to transmit an image, and whether or not to extend their arms to examine rocks, which would save much time for scientists as they would not have to sift through hundreds of images to find the one they want, or examine the surroundings to decide to extend the arms and examine the rocks.[39]
Silica Valley Rover exposes silica-rich dust Spirit' s dead wheel turned out to be a mixed blessing. As it was traveling in March 2007, pulling the dead wheel behind, the wheel scraped off the upper layer of the Martian soil, uncovering a patch of ground that scientists say shows evidence of a past environment that would have been perfect for microbial life. It is similar to areas on Earth where water or steam from hot springs came into contact with volcanic rocks. On Earth, these are locations that tend to teem with bacteria, said rover chief scientist Steve Squyres . "We're really excited about this," he told a meeting of the American Geophysical Union (AGU). The area is extremely rich in silica –the main ingredient of window glass. The researchers have now concluded that the bright material must have been produced in one of two ways. One: hot-spring deposits produced when water dissolved silica at one location and then carried it to another (i.e. a geyser). Two: acidic steam rising through cracks in rocks stripped them of their mineral components, leaving silica behind. "The important thing is that whether it is one hypothesis or the other, the implications for the former habitability of Mars are pretty much the same," Squyres explained to BBC News. Hot water provides an environment in which microbes can thrive and the precipitation of that silica entombs and preserves them. Squyres added, "You can go to hot springs and you can go to fumaroles and at either place on Earth it is teeming with life – microbial life ."[40] [41]
Global dust storm and Home Plate During 2007 Spirit spent several months near the base of the Home Plate plateau. On sol 1306 Spirit climbed onto the eastern edge of the plateau. In September and October it examined rocks and soils at several locations on the southern half of the plateau. On November 6, Spirit had reached the western edge of Home Plate, and started taking pictures for a panoramic overview of the western valley, with Grissom Hill and Husband Hill visible. The panorama image was published on NASA's website on January 3, 2008 to little attention, until January 23, when an independent website published a magnified detail of the image that showed a rock feature a few centimeters high resembling a humanoid figure seen from the side with its right arm partially raised.[42] [43]
Circular projection showing Spirit' s solar panels covered in dust – October 2007 Towards the end of June 2007, a series of dust storms began clouding the Martian atmosphere with dust. The storms intensified and by July 20, both Spirit and Opportunity were facing the real possibility of system failure due to lack of energy. NASA released a statement to the press that said (in part) "We're rooting for our rovers to survive these storms, but they were never designed for conditions this intense".[44] Opportunity , and slightly more to Spirit .
Normally the solar arrays on the rovers are able to generate up to 700 watt-hours (2,500 kJ) of energy per Martian day . After the storms, the amount of energy generated was greatly reduced to 128 watt-hours (460 kJ). If the rovers generate less than 150 watt-hours (540 kJ) per day they must start draining their batteries to run survival heaters. If the batteries run dry, key electrical elements are likely to fail due to the intense cold. Both rovers were put into the lowest-power setting in order to wait out the storms. In early August the storms began to clear slightly, allowing the rovers to successfully charge their batteries. They were kept in hibernation in order to wait out the remainder of the storm.[45]
2008 Hibernating The main concern was the energy level for Spirit . To increase the amount of light hitting the solar panels, the rover was parked in the northern part of Home Plate on as steep a slope as possible. It was expected that the level of dust cover on the solar panels would increase by 70 percent and that a slope of 30 degrees would be necessary to survive the winter. In February, a tilt of 29.9 degrees was achieved. Extra energy was available at times, and a high definition panorama named Bonestell was produced. At other times there was only enough solar energy to recharge the batteries, communication with Earth was minimized and all unnecessary instruments were switched off. At winter solstice the energy production declined to 235 watt hours per sol.[46]
Winter dust storm On November 10, 2008, a large dust storm further reduced the output of the solar panels to 89 watt-hours (320 kJ) per day—a critically low level.[47] Spirit would survive the storm, and that the energy level would rise once the storm had passed and the skies started clearing. They attempted to conserve energy by shutting down systems for extended periods of time, including the heaters. On November 13, 2008 the rover awoke and communicated with mission control as scheduled.[48]
From sols 1728 to 1734, November 14, 2008 to November 20, 2008 Spirit averaged 169 watt-hours (610 kJ) per day. The heaters for the thermal emission spectrometer, which used about 27 watt-hours (97 kJ) per day, were disabled on November 11, 2008. Tests on the thermal emission spectrometer indicate that it was undamaged, and the heaters would be enabled with sufficient energy.[49] solar conjunction , where the Sun is between Earth and Mars, started on November 29, 2008 and communication with the rovers was not possible until December 13, 2008.[50]
2009 Increased energy On February 6, 2009, a beneficial wind blew off some of the dust accumulated on the panels. This led to an increase in energy output to 240 watt-hours (860 kJ) per day. NASA officials stated that this increase in energy was to be used predominantly for driving.[51]
On sol 1879 April 18, 2009 and sol 1889 April 28, 2009 energy output of the solar arrays were increased by cleaning events.[52] [53] Spirit's solar arrays climbed from 223 watt-hours (800 kJ) per day on March 31, 2009 to 372 watt-hours (1,340 kJ) per day on April 29, 2009.[53]
Sand trap Engineers attempt to replicate conditions in the laboratory of Spirit' s entrapment on a rock and in fluffy material churned by the rover's left-front wheel. On sol 1892 (May 1, 2009), the rover became stuck in soft soil, the machine resting upon a cache of iron(III) sulfate (jarosite ) hidden under a veneer of normal-looking soil. Iron sulfate has very little cohesion, making it difficult for the rover's wheels to gain traction.[54] [55]
JPL team members simulated the situation by means of a rover mock-up and computer models in an attempt to get the rover back on track. To reproduce the same soil mechanical conditions on Earth as those prevailing on Mars under low gravity and under very weak atmospheric pressure, tests with a lighter version of a mock-up of Spirit were conducted at JPL in a special sandbox to attempt to simulate the cohesion behavior of poorly consolidated soils under low gravity.[56] [57] [21]
On sol 2116 December 17, 2009, the right-front wheel suddenly began to operate normally for the first three out of four rotations attempts. It was unknown what effect it would have on freeing the rover if the wheel became fully operational again. The right rear wheel had also stalled on sol 2097 November 28 and remained inoperable for the remainder of the mission. This left the rover with only four fully operational wheels.[58] [59]
2010 Mars winter at Troy Color panorama from "Troy" embedding location On sol 2155 January 26, 2010, after several months attempting to free the rover, NASA decided to redefine the mobile robot mission by calling it a stationary research platform. Efforts were directed in preparing a more suitable orientation of the platform in relation to the Sun in an attempt to allow a more efficient recharge of the platform's batteries. This was needed to keep some systems operational during the Martian winter.[60] [61]
Spirit' s concluding journey around Homeplate and ending location.The last communication with the rover was on sol 2210 (March 22, 2010)[62] Spirit had survived these conditions and there had been a cleaning event, there was a possibility that with the southern summer solstice in March 2011, solar energy would increase to a level that would wake up the rover.[63]
Communication attempts Spirit remains silent at its location, called "Troy," on the west side of Home Plate. As of 2015[update]
It is likely that Spirit experienced a low-power fault and had turned off all sub-systems, including communication, and gone into a deep sleep, trying to recharge its batteries. It is also possible that the rover had experienced a mission clock fault. If that had happened, the rover would have lost track of time and tried to remain asleep until enough sunlight struck the solar arrays to wake it. This state is called "Solar Groovy." If the rover woke up from a mission clock fault, it would only listen. Starting on Sol 2333 (July 26, 2010), a new procedure to address the possible mission clock fault was implemented.
Each sol, the Deep Space Network mission controllers sent a set of X-band "Sweep & Beep" commands. If the rover had experienced a mission clock fault and then had been awoken during the day, it would have listened during brief, 20-minute intervals during each hour awake. Due to the possible clock fault, the timing of these 20-minute listening intervals was not known, so multiple "Sweep & Beep" commands were sent. If the rover heard one of these commands, it would have responded with an X-band beep signal, updating the mission controllers on its status and allowing them to investigate the state of the rover further. But even with this new strategy, there was no response from the rover.
The rover had driven 7,730.50 meters (4.80 miles) until it became immobile.[64]
2011 Mission end JPL continued attempts to regain contact with Spirit until May 25, 2011, when NASA announced the end of contact efforts and the completion of the mission.[12] [14] [65] [14] Spirit were transitioned to support Spirit's "still-active twin", Opportunity [12] Curiosity [citation needed Two NASA Mars orbiters and the Deep Space Network of antennas were prepared for the Curiosity launch that took place on November 26, 2011.[citation needed
Discoveries about Martian rocks and minerals The rocks on the plains of Gusev are a type of basalt . They contain the minerals olivine , pyroxene , plagioclase , and magnetite, and they look like volcanic basalt as they are fine-grained with irregular holes (geologists would say they have vesicles and vugs).[66] [67]
Annotated panorama of rocks near Spirit (April, 2006). Much of the soil on the plains came from the breakdown of the local rocks. Fairly high levels of nickel were found in some soils; probably from meteorites .[68]
Analysis shows that the rocks have been slightly altered by tiny amounts of water. Outside coatings and cracks inside the rocks suggest water deposited minerals, maybe bromine compounds. All the rocks contain a fine coating of dust and one or more harder rinds of material. One type can be brushed off, while another needed to be ground off by the Rock Abrasion Tool (RAT).[69]
There are a variety of rocks in the Columbia Hills (Mars) , some of which have been altered by water, but not by very much water.
The dust in Gusev Crater is the same as dust all around the planet. All the dust was found to be magnetic. Moreover, Spirit found the magnetism was caused by the mineral magnetite , especially magnetite that contained the element titanium . One magnet was able to completely divert all dust hence all Martian dust is thought to be magnetic.[70] Tharsis and Arabia that have been detected by orbiting satellites. A thin layer of dust, maybe less than one millimeter thick covers all surfaces. Something in it contains a small amount of chemically bound water.[71] [72]
Plains
Adirondack
Above : An
approximate true-color view of Adirondack, taken by Spirit's pancam.
Right :Digital camera image (from Spirit's
Pancam ) of Adirondack after a
RAT grind (Spirit's rock grinding tool)
Feature type
Rock
Coordinates
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Observations of rocks on the plains show they contain the minerals pyroxene, olivine, plagioclase, and magnetite. These rocks can be classified in different ways. The amounts and types of minerals make the rocks primitive basalts—also called picritic basalts. The rocks are similar to ancient terrestrial rocks called basaltic komatiites . Rocks of the plains also resemble the basaltic shergottites , meteorites that came from Mars. One classification system compares the amount of alkali elements to the amount of silica on a graph; in this system, Gusev plains rocks lie near the junction of basalt, picrobasalt , and tephite. The Irvine-Barager classification calls them basalts.[66] [66] [67]
Cross-sectional drawing of a typical rock from the plains of Gusev crater. Most rocks contain a coating of dust and one or more harder coatings. Veins of water-deposited minerals are visible, along with crystals of olivine . Veins may contain bromine salts.
Columbia Hills Scientists found a variety of rock types in the Columbia Hills, and they placed them into six different categories. The six are: Clovis, Wishbone, Peace, Watchtower, Backstay, and Independence. They are named after a prominent rock in each group. Their chemical compositions, as measured by APXS, are significantly different from each other.[73] [74] sulfates .[75] [76]
Acid fog is believed to have changed some of the Watchtower rocks. This was in a 200 meter long section of Cumberland Ridge and the Husband Hill summit. Certain places became less crystalline and more amorphous. Acidic water vapor from volcanoes dissolved some minerals forming a gel. When water evaporated a cement formed and produced small bumps. This type of process has been observed in the lab when basalt rocks are exposed to sulfuric and hydrochloric acids.[77] [78] [79]
The Clovis group is especially interesting because the Mössbauer spectrometer (MB) detected goethite in it.[80] [75] [81] anhydrate (a sulfate). Peace rocks showed sulfur and strong evidence for bound water, so hydrated sulfates are suspected. Watchtower class rocks lack olivine consequently they may have been altered by water. The Independence class showed some signs of clay (perhaps montmorillonite a member of the smectite group). Clays require fairly long term exposure to water to form. One type of soil, called Paso Robles, from the Columbia Hills, may be an evaporate deposit because it contains large amounts of sulfur, phosphorus , calcium , and iron.[74] 3+ form, which would happen if water had been present.[71]
Towards the middle of the six-year mission (a mission that was supposed to last only 90 days), large amounts of pure silica were found in the soil.[82] [83]
After Spirit stopped working scientists studied old data from the Miniature Thermal Emission Spectrometer, or Mini-TES and confirmed the presence of large amounts of carbonate -rich rocks, which means that regions of the planet may have once harbored water. The carbonates were discovered in an outcrop of rocks called "Comanche."[84] [85]
In summary, Spirit found evidence of slight weathering on the plains of Gusev, but no evidence that a lake was there. However, in the Columbia Hills there was clear evidence for a moderate amount of aqueous weathering. The evidence included sulfates and the minerals goethite and carbonates that only form in the presence of water. It is believed that Gusev crater may have held a lake long ago, but it has since been covered by igneous materials. All the dust contains a magnetic component that was identified as magnetite with some titanium. Furthermore, the thin coating of dust that covers everything on Mars is the same in all parts of Mars.
Astronomy <templatestyles src="Module:Hatnote/styles.css"></templatestyles>
Spirit pointed its cameras towards the sky and observed a transit of the Sun by Mars' moon Deimos (see Transit of Deimos from Mars ). It also took the first photo of Earth from the surface of another planet in early March 2004.
In late 2005, Spirit took advantage of a favorable energy situation to make multiple nighttime observations of both of Mars' moons Phobos and Deimos .[86] lunar " (or rather phobian) eclipse as Spirit watched Phobos disappear into Mars' shadow. Some of Spirit' s star gazing was designed to look for a predicted meteor shower caused by Halley's Comet , and although at least four imaged streaks were suspect meteors, they could not be unambiguously differentiated from those caused by cosmic rays.[86]
A transit of Mercury from Mars took place on January 12, 2005 from about 14:45 UTC to 23:05 UTC. Theoretically, this could have been observed by both Spirit and Opportunity 6.1" angular diameter. They were able to observe transits of Deimos across the Sun, but at 2' angular diameter, Deimos is about 20 times larger than Mercury's 6.1" angular diameter. Ephemeris data generated by JPL Horizons indicates that Opportunity would have been able to observe the transit from the start until local sunset at about 19:23 UTC Earth time, while Spirit would have been able to observe it from local sunrise at about 19:38 UTC until the end of the transit.[clarification needed [87]
Equipment wear and failures Both rovers have passed their original mission time of 90 sols many times over and the extended time on the surface, and therefore additional stress on components, has resulted in some issues developing.
On sol 778 (March 13, 2006), the right front wheel ceased working[88]
Scientific instruments also experienced degradation as a result of exposure to the harsh Martian environment and use over a far longer period than had been anticipated by the mission planners. Over time, the diamond in the resin grinding surface of the Rock Abrasion Tool wore down, after that the device could only be used to brush targets.[89] Spirit' s life, the MIMOS II Mössbauer spectrometer took much longer to produce results than it did earlier in the mission because of the decay of its cobalt -57 gamma ray source that has a half life of 271 days.
Honors Martian sunset in 2005 by Spirit To rover To commemorate Spirit' s great contribution to the exploration of Mars , the asteroid 37452 Spirit has been named after it.[90] Ingrid van Houten-Groeneveld who along with Cornelis Johannes van Houten and Tom Gehrels discovered the asteroid on September 24, 1960.
Reuben H. Fleet Science Center and the Liberty Science Center also have an IMAX show called Roving Mars that documents the journey of both Spirit and Opportunity , using both CG and actual imagery.
January 4, 2014 was celebrated as the tenth anniversary of its landing on many news sites, despite nearly 4 years since loss of communications.[91]
To honor the rover, the JPL team named an area near Endeavour Crater explored by the Opportunity rover , 'Spirit Point'.[92]
From rover On 22 January 27, 2004 NASA memorialized the crew of Apollo 1 by naming three hills to the north of "Columbia Memorial Station" as the Apollo 1 Hills . On 28 February 2, 2004 the astronauts on Space Shuttle Columbia's final mission were further memorialized when NASA named a set of hills to the east of the landing site the Columbia Hills Complex , denoting seven peaks in that area as "Anderson", "Brown", "Chawla", "Clark", "Husband", "McCool", and "Ramon"; NASA has submitted these geographical feature names to the IAU for approval.
Pictures The rover can take pictures with its different cameras. But only the PanCam camera has the ability to photograph a scene with different color filters. The panorama views are usually built up from PanCam images. Spirit has transferred 128,224 pictures in its lifetime.[93]
Views
Looking back from Bonneville crater to the landing site
Panoramas Missoula Crater (Sol 105, April 19, 2004 Lahontan crater on sol 120 Color panorama taken from "Larry's Lookout". On the far left is "Tennessee Valley" and on the right, rover tracks. Annotated Apollo Hills panorama from the Spirit landing site Spirit' s West Valley panorama (color not rectificated for media). NASA'S Mars Exploration Rover Spirit captured this westward view from atop a low plateau where Spirit spent the closing months of 2007.Microscopic images
Close-up of the rock Mazatzal , which was ground with the Rock Abrasion Tool on sol 82
From orbit
Spirit on Sept. 29, 2006 beside Home Plate
[94]
Maps
Map of the movement of the Spirit rover up to 2008.
Spirit's location in context
Interactive imagemap of the global topography of Mars, overlain with locations of Mars landers and rovers. Hover your mouse to see the names of prominent geographic features, and click to link to them. Coloring of the base map indicates relative elevations, based on data from the Mars Orbiter Laser Altimeter on NASA's Mars Global Surveyor . Reds and pinks are higher elevation (+3 km to +8 km); yellow is 0 km; greens and blues are lower elevation (down to −8 km). Whites (>+12 km) and browns (>+8 km) are the highest-most elevations. Axes are latitude and longitude; note poles are not shown. Spirit (2004) >
See also <templatestyles src="Div col/styles.css"/>
2
References
↑ 1.0 1.1 1.2 Lua error in package.lua at line 80: module 'strict' not found. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ September 30 – October 5, 2010 Spirit Remains Silent at Troy NASA. 2010-10-05.↑ A.J.S. Rayl Mars Exploration Rovers Update Planetary Society ↑ 12.0 12.1 12.2 Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ 14.0 14.1 14.2 Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ The scientific objectives of the Mars Exploration Rover ↑ NASA.gov , MER-A 20040121a↑ Mars Exploration Rover Mission: The Mission ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ 21.0 21.1 Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Gusev Crater ↑ Spaceflightnow.com , Destination Mars, Rover headed toward hilly vista for martian exploration↑ APOD: 2004 January 14 – A Mars Panorama from the Spirit Rover ↑ MER color imagery, methods ↑ Planetary Blog .↑ Mars Exploration Rover Mission: Press Releases ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ http://marsrovers.jpl.nasa.gov/mission/status_spiritAll_2004.html#sol171 ↑ http://marsrovers.jpl.nasa.gov/mission/status_spiritAll_2005.html#sol416 ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ http://marsrovers.jpl.nasa.gov/mission/status_spiritAll_2005.html#sol655 ↑ http://www.nasa.gov/mission_pages/mer/multimedia/gallery/comanche-no-label.html ↑ Mars Exploration Rover Mission: All Spirit Updates ↑ NASA – NASA Mars Rovers Head for New Sites After Studying Layers ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Planetary.org Emily Lakdawalla, Teeny little Bigfoot on Mars , January 23, 2008 | 12:41 PST | 20:41 UTC↑ Spirit's West Valley Panorama image ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ http://marsrovers.jpl.nasa.gov/mission/status_spiritAll_2008.html ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ 53.0 53.1 Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ A.J.S. Rayl Spirit Sleeps Soundlessly, Opportunity Turns a Corner Planetary Society ↑ http://marsrovers.jpl.nasa.gov/mission/status_spiritAll_2010.html#sol2335 ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ 66.0 66.1 66.2 Lua error in package.lua at line 80: module 'strict' not found. ↑ 67.0 67.1 Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ 71.0 71.1 Bell, J (ed.) The Martian Surface. 2008. Cambridge University Press. ISBN 978-0-521-86698-9 ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ 74.0 74.1 Lua error in package.lua at line 80: module 'strict' not found. ↑ 75.0 75.1 Lua error in package.lua at line 80: module 'strict' not found. ↑ Christensen, P.R. (2005) Mineral Composition and Abundance of the Rocks and Soils at Gusev and Meridiani from the Mars Exploration Rover Mini-TES Instruments AGU Joint Assembly, May 23–27, 2005 http://www.agu.org/meetings/sm05/waissm05.html ↑ http://spaceref.com/mars/signs-of-acid-fog-found-on-mars.html ↑ https://gsa.confex.com/gsa/2015AM/webprogram/Paper266774.html ↑ COLE, Shoshanna B., et al. 2015. IN-SITU EVIDENCE FOR ALTERATION BY ACID FOG ON HUSBAND HILL, GUSEV CRATER, MARS. 2015 GSA Annual Meeting in Baltimore, Maryland, USA (1–4 November 2015) Paper No. 94-10 ↑ Klingelhofer, G., et al. (2005) Lunar Planet. Sci. XXXVI abstr. 2349 ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ http://www.nasa.gov/mission_pages/mer/mer-20070521.html ↑ http://www.sciencedaily.com/releases/2010/06/100603140959.htm ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ 86.0 86.1 Jim Bell (Cornell University) et al. Pancam Projects: Spirit Night-time Imaging . Retrieved 2008-10-21 ↑ Horizons System ↑ JPL.NASA.GOV: Mars Exploration Rovers ↑ [1] ↑ Mars Exploration Rover Mission: Features ↑ Revered Spirit rover landed on Mars a decade ago ↑ Lua error in package.lua at line 80: module 'strict' not found. ↑ Spirit: All Raw Images ↑ [2]
External links
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JPL, MSSS, and NASA links Other links
SpaceFlightNow Spaceflightnow.com , Status Page last updated May 2004Marsbase.net , a site that tracks time on Mars.MAESTRO – public version of rover simulation software (requires download, last update October 25, 2004)Cornell's rover site: Athena last update 2006Finding Spirit : interactive Mars atlas based on Viking images: you can zoom in/out and pan images, to find your preferred site. "Spirit" approximate position is 14.82°S (= −14.82°N), 184.85°W (= 5.15°E) (not working as of June 4, 2008)Google map with Spirit landing site marked (AXCH) 2004 Mars Exploration Rovers Highlights – News, status, technical info, history, and more.New Scientist on Spirit Dust Devils , March 15, 2005New Scientist on Spirit wheel status , April 3, 2006Unmanned Spaceflight.com discussion on Spirit as of 2008-06-04 last updated 2008-06-04 Full-page, High-res spherical panorama of Spirit in the Columbia Hills , nasatech.net, Nov 23 to Dec 5, 2005 (long download, uses Java ) Full-page, High-res spherical panorama of Spirit at the summit of Husband Hill , nasatech.net, Nov 23 to Dec 5, 2005 (long download, uses Java ) Daily Mail article on Spirit , many photosXKCD cartoon on Spirit
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