Fobos-Grunt
Template:Short description Template:Use British English Template:Use dmy dates Template:Infobox spaceflight
Fobos-Grunt or Phobos-Grunt (Template:Langx) was an attempted Russian sample return mission to Phobos, one of the moons of Mars. Fobos-Grunt also carried the Chinese Mars orbiter Yinghuo-1 and the tiny Living Interplanetary Flight Experiment funded by the Planetary Society.<ref name=amos>Template:Cite news</ref><ref name=Emily>Template:Cite work</ref>
It was launched on 8 November 2011, at 20:16 UTC, from the Baikonur Cosmodrome, but subsequent rocket burns intended to set the craft on a course for Mars failed, leaving it stranded in low Earth orbit.<ref name="noburn">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=vlad/> Efforts to reactivate the craft were unsuccessful, and it fell back to Earth in an uncontrolled re-entry on 15 January 2012, over the Pacific Ocean, west of Chile.<ref>"Russia's failed Phobos-Grunt space probe heads to Earth", BBC News, 14 January 2012</ref><ref name="Fox News">Template:Cite news</ref><ref>"Russia asks if US radar ruined Phobos-Grunt space probe", NBC News, 17 January 2012</ref> The return vehicle was to have returned to Earth in August 2014, carrying up to Template:Cvt of soil from Phobos.
Funded by the Russian Federal Space Agency and developed by Lavochkin and the Russian Space Research Institute, Fobos-Grunt was the first Russian-led interplanetary mission since the failed Mars 96. The last successful interplanetary missions were the Soviet Vega 2 in 1985–1986, and the partially successful Phobos 2 in 1988–1989.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Fobos-Grunt was designed to become the first spacecraft to return a macroscopic sample from an extraterrestrial body since Luna 24 in 1976.<ref name="universetoday_daring">Template:Cite news</ref>
Project historyEdit
BudgetEdit
The cost of the project was 1.5 billion rubles (US$64.4 million).Template:Citation needed Project funding for the timeframe 2009–2012, including post-launch operations, was about 2.4 billion rubles.<ref name="preflight">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The total cost of the mission was to have been 5 billion rubles (US$163 million).
According to lead scientist Alexander Zakharov, the entire spacecraft and most of the instruments were new, though the designs drew upon the nation's legacy of three successful Luna missions, which in the 1970s retrieved a few hundred grams of Moon rocks.<ref>Template:Cite news</ref> Zakharov had described the Phobos sample return project as "possibly the most difficult interplanetary one to date".<ref name="mt_prelaunch"/>
DevelopmentEdit
The Fobos-Grunt project began in 1999, when the Russian Space Research Institute and NPO Lavochkin, the main developer of Soviet and Russian interplanetary probes, initiated a 9 million rouble feasibility study into a Phobos sample-return mission. The initial spacecraft design was to be similar to the probes of the Phobos program launched in the late 1980s.<ref name="harvey_fobos"/> Development of the spacecraft started in 2001 and the preliminary design was completed in 2004.Template:Citation needed For years, the project stalled as a result of low levels of financing of the Russian space program. This changed in the summer of 2005, when the new government plan for space activities in 2006–2015 was published. Fobos-Grunt was now made one of the program's flagship missions. With substantially improved funding, the launch date was set for October 2009. The 2004 design was revised a couple of times and international partners were invited to join the project.<ref name="harvey_fobos">Template:Cite book</ref> In June 2006, NPO Lavochkin announced that it had begun manufacturing and testing the development version of the spacecraft's onboard equipment.Template:Citation needed
On 26 March 2007, Russia and China signed a cooperative agreement on the joint exploration of Mars, which included sending China's first interplanetary probe, Yinghuo-1, to Mars together with the Fobos-Grunt spacecraft.Template:Citation needed Yinghuo-1 weighed Template:Cvt and would have been released by the main spacecraft into a Mars orbit.<ref name="Popovkin"/>
PartnersEdit
NPO Lavochkin was the project's main contractor developing its components. The Chief Designer of Fobos-Grunt was Maksim Martynov.<ref>Biography of Maksim MartynovTemplate:In lang</ref> Phobos soil sampling and downloading were developed by the GEOHI RAN Institute of the Russian Academy of Sciences (Vernadski Institute of Geochemistry and Analytical chemistry) and the integrated scientific studies of Phobos and Mars by remote and contact methods were the responsibility of the Russian Space Research Institute,<ref name="ESA_PMR"/> where Alexander Zakharov served as lead scientist of the mission.<ref name="mt_prelaunch">Template:Cite news</ref>
The Chinese Yinghuo-1 orbiter was launched together with Fobos-Grunt.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> In late 2012, after a 10–11.5-month cruise, Yinghuo-1 would have separated and entered an 800 × 80,000 km equatorial orbit (5° inclination) with a period of three days. The spacecraft was expected to remain on Martian orbit for one year. Yinghuo-1 would have focused mainly on the study of the external environment of Mars. Space center researchers expected to use photographs and data to study the magnetic field of Mars and the interaction between ionospheres, escape particles and solar wind.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
A second Chinese payload, the Soil Offloading and Preparation System (SOPSYS), was integrated in the lander. SOPSYS was a microgravity grinding tool developed by the Hong Kong Polytechnic University.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Another payload on Fobos-Grunt was an experiment from the Planetary Society called Living Interplanetary Flight Experiment; its goal was to test whether selected organisms can survive a few years in deep space by flying them through interplanetary space. The experiment would have tested one aspect of transpermia, the hypothesis that life could survive space travel, if protected inside rocks blasted by impact off one planet to land on another.<ref name=planetary-life>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=Zak1>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="ASMp4"/><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
The Bulgarian Academy of Sciences contributed with a radiation measurement experiment on Fobos-Grunt.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Two MetNet Mars landers developed by the Finnish Meteorological Institute, were planned to be included as payload of the Fobos-Grunt mission,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> but weight constraints on the spacecraft required dropping the MetNet landers from the mission.<ref name="preflight"/>
Postponed 2009 launchEdit
The October 2009 launch date could not be achieved due to delays in the spacecraft development. During 2009, officials admitted that the schedule was very tight, but still hoped until the last moment that a launch could be made.<ref name="ASMp4">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> On 21 September 2009, the mission was officially announced to be delayed until the next launch window in 2011.<ref name="preflight"/><ref name="rian_delay">Template:Cite news</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="spectrum_delay">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> A main reason for the delay was difficulties encountered during development of the spacecraft's onboard computers. While the Moscow-based company Tehkhom provided the computer hardware on time, the internal NPO Lavochkin team responsible for integration and software development fell behind schedule.<ref name="zak_spacenews">Template:Cite news</ref> The retirement of NPO Lavochkin's head Valeriy N. Poletskiy in January 2010 was widely seen as linked to the delay of Fobos-Grunt. Viktor Khartov was appointed the new head of the company. During the extra development time resulting from the delay, a Polish-built drill was added to the Phobos lander as a back-up soil extraction device.<ref name="zak_bbc_rebirth">Template:Cite news</ref>
2011 launchEdit
The spacecraft arrived at Baikonur Cosmodrome on 17 October 2011 and was transported to Site 31 for pre-launch processing.<ref name=russianspaceweb_phobos_grunt_arrives_to_baikonur>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The Zenit-2SB41 launch vehicle carrying Fobos-Grunt successfully lifted off from Baikonur Cosmodrome at 20:16 UTC on 8 November 2011.Template:Citation needed The Zenit booster inserted the spacecraft into an initial Template:Cvt elliptical low Earth orbit with an inclination of 51.4°.<ref name="psr_profile"/>
Two firings of the main propulsion unit in Earth orbit were required to send the spacecraft onto the interplanetary trajectory. Since both engine ignitions would have taken place outside the range of Russian ground stations, the project participants asked volunteers around the world to take optical observations of the burns, e.g. with telescopes, and report the results to enable more accurate prediction of the mission flight path upon entry into the range of Russian ground stations.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Post-launchEdit
It was expected that after 2.5 hours and 1.7 revolutions in the initial orbit, the autonomous main propulsion unit (MDU), derived from the Fregat upper stage, would conduct its firing to insert the spacecraft into the elliptical orbit (250 km x 4150–4170 km) with a period of about 2.2 hours. After the completion of the first burn, the external fuel tank of the propulsion unit was expected to be jettisoned, with ignition for a second burn to depart Earth orbit scheduled for one orbit, or 2.1 hours, after the end of the first burn.<ref name="psr_profile">Mission profile Phobos-Soil project Template:Webarchive</ref><ref name=InterfaxNov082011>Template:Cite news</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The propulsion module constitutes the cruise-stage bus of Fobos-Grunt. According to original plans, Mars orbit arrival had been expected during September 2012 and the return vehicle was scheduled to reach Earth in August 2014.<ref name="ESA_PMR">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="PlanetaryBlog">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Following what would have been the planned end of the first burn, the spacecraft could not be located in the target orbit. The spacecraft was subsequently discovered to still be in its initial parking orbit and it was determined that the burn had not taken place.<ref name="noburn"/> Initially, engineers had about three days from launch to rescue the spacecraft before its batteries ran out.<ref name="Popovkin"/> It was then established that the craft's solar panels had deployed, giving engineers more time to restore control. It was soon discovered the spacecraft was adjusting its orbit, changing its expected re-entry from late November or December 2011 to as late as early 2012.<ref name=davidw>David Warmflash, M.D. – Phobos-Grunt's Mysterious Thruster Activation: A Function of Safe Mode or Just Good Luck? (16 November 2011) – Universe Today</ref> Even though it had not been contacted, the spacecraft seemed to be actively adjusting its perigee (the point it is closest to Earth in its orbit).<ref name=davidw/><ref name="ItarTASS1122">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
ContactEdit
On 22 November 2011, a signal from the probe was picked up by the European Space Agency's tracking station in Perth, Australia, after it had sent the probe the command to turn on one of its transmitters. The European Space Operations Centre (ESOC) in Darmstadt, Germany, reported that the contact was made at 20:25 UTC on 22 November 2011 after some modifications had been made to the Template:Convert dish facility in Perth to improve its chances of getting a signal.<ref name=BBCNOV23>Template:Cite news</ref> No telemetry was received in this communication.<ref name="SF">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> It remained unclear whether the communications link would have been sufficient to command the spacecraft to switch on its engines to take it on its intended trajectory toward Mars.<ref name=spacenews>Template:Cite news</ref> Roscosmos officials said that the window of opportunity to salvage Fobos-Grunt would close in early December 2011.<ref name="spacenews"/>
The next day, on 23 November 2011, the Perth station again made contact with the spacecraft and during 6 minutes, about 400 telemetry "frames" and Doppler information were received.<ref name="SF"/><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="MSNBC">Template:Cite news</ref> The amount of information received during this communication was not sufficient, and therefore it was not possible to identify the problem with the probe.<ref name="MSNBC"/><ref name=end>Template:Cite news</ref> Further communication attempts made by ESA were unsuccessful and contact was not reestablished.<ref>Template:Cite news</ref> The space vehicle did not respond to the commands sent by the European Space Agency to raise its orbit. Roscosmos provided these commands to ESA.<ref name="SF"/>
From Baikonour, Kazakhstan, Roscosmos was able to receive telemetry from Fobos-Grunt on 24 November 2011Template:Citation needed but attempts to contact it failed. This telemetry demonstrated that the probe's radio equipment was working and that it was communicating with the spacecraft's flight control systems.Template:Citation needed Moreover, Roscosmos's top officials believed Fobos-Grunt to be functional, stably oriented and charging batteries through its solar panels.<ref name="SF"/>
In a late November 2011 interview, the service manager of the European Space Agency for Fobos-Grunt, Wolfgang Hell, stated that Roscosmos had a better understanding of the problem with the spacecraft, saying they reached the conclusion that they have some kind of power problem on board.<ref name="space.com">Template:Cite news</ref>
ESA failed to communicate with the space probe in all of the five opportunities the agency had between 28 and 29 November 2011. During those occasions, the spacecraft did not comply with orders to fire the engines and raise its orbit. The Russian space agency then requested that ESA repeat the orders.<ref>Template:Cite news</ref> The European Space Agency decided to end the efforts to contact the probe on 2 December 2011, with one analyst saying that Fobos-Grunt appeared "dead in the water".<ref>Template:Cite news</ref> However, ESA made teams available to assist the Fobos-Grunt mission if there was a change in situation.<ref name=end/> In spite of that, Roscosmos stated its intention to continue to try to contact the space vehicle until it entered the atmosphere.Template:Citation needed
The U.S. Strategic Command's Joint Space Operations Center (JSpOC) tracked the probe and identified at the start of December 2011 that Fobos-Grunt had an elliptical Earth orbit at an altitude of between Template:Cvt and Template:Cvt, but falling a few kilometers each day.<ref>Template:Cite news</ref><ref>Template:Cite news</ref>
Re-entryEdit
Before reentry, the spacecraft still carried about 7.51 tonnes of highly toxic hydrazine and nitrogen tetroxide on board.<ref name=vlad>Vladimir Ischenkov – Russian scientists struggle to save Mars moon probe (9 November 2011) – Associated Press</ref><ref name="Popovkin">Template:Cite news</ref> This was mostly fuel for the spacecraft's upper stage. These compounds, with melting points of 2 °C and −11.2 °C, are normally kept in liquid form and were expected to burn out during re-entry.<ref name="Popovkin"/> NASA veteran James Oberg said the hydrazine and nitrogen tetroxide "could freeze before ultimately entering", thus contaminating the impact area.<ref name=vlad/> He also stated that if Fobos-Grunt were not salvaged, it may be the most dangerous object to fall from orbit.<ref name=vlad/> Meanwhile, the head of Roscosmos said the probability of parts reaching the Earth surface was "highly unlikely" and that the spacecraft, including the LIFE module and the Yinghuo-1 orbiter, would be destroyed during re-entry.<ref name="Popovkin"/>
Russian military sources claimed that Fobos-Grunt was somewhere over the Pacific Ocean between New Zealand and South America when it re-entered the atmosphere at about 17:45 UTC.Template:Citation needed Although it was initially feared its remains would reach land as close as Template:Convert west of Santa Fe, Argentina, the Russian military Air and Space Defense Forces reported that it ultimately fell into the Pacific Ocean, Template:Cvt west of Wellington Island, Chile.<ref name="Fox News"/> The Defence Ministry spokesman subsequently revealed that such estimate was based on calculations, without witness reports. In contrast, Russian civilian ballistic experts said that the fragments had fallen over a broader patch of Earth's surface, and that the midpoint of the crash zone was located in the Goiás state of Brazil.<ref name=Ballistics>Template:Cite news</ref><ref>Template:Cite news</ref>
AftermathEdit
Initially, the head of Roscosmos Vladimir Popovkin, suggested that the Fobos-Grunt failure might have been the result of sabotage by a foreign nation.<ref>"Foreign sabotage suspected in Phobos-Grunt meltdown", theregister.co.uk, 10 January 2012</ref><ref name="msnbc-10-Jan-2012">Template:Cite news</ref> He also stated that risky technical decisions had been made because of limited funding. On 17 January 2012, an unidentified Russian official speculated that a U.S. radar stationed on the Marshall Islands may have inadvertently disabled the probe, but cited no evidence.<ref>Template:Cite news</ref> Popovkin suggested the microchips may have been counterfeit,<ref name="Itar-Tass-20120131">Template:Cite news</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> then he announced on 1 February 2012 that a burst of cosmic radiation may have caused computers to reboot and go into a standby mode.<ref>Template:Cite news</ref><ref name="Reuters">Template:Cite news</ref> Industry experts cast doubt on the claim citing how unlikely the effects of such a burst are in low Earth orbit, inside the protection of Earth's magnetic field.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
On 6 February 2012, the commission investigating the mishap concluded that Fobos-Grunt mission failed because of "a programming error which led to a simultaneous reboot of two working channels of an onboard computer". The craft's rocket pack never fired due to the computer reboot, leaving the craft stranded in Earth orbit.<ref>Template:Cite news</ref><ref>Template:Cite news</ref> Although the specific failure was identified, experts suggest it was the culmination of poor quality control,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Phobos-Grunt failure criticized Template:Webarchive</ref> lack of testing,<ref>Template:Cite news</ref> security issues and corruption.<ref>Template:Cite news</ref> Russian president Dmitry Medvedev suggested that those responsible should be punished and perhaps criminally prosecuted.<ref name="Itar-Tass-20120131"/><ref>Template:Cite news</ref><ref>Template:Cite news</ref>
Repeat missionEdit
In January 2012, scientists and engineers at the Russian Space Research Institute and NPO Lavochkin called for a repeat sample return mission called Fobos-Grunt-2<ref name='Ambitious_Projects'>Template:Cite news</ref> and Boomerang<ref>Template:Cite journal</ref><ref>Russia to make another attempt to bring back Mars moon material 16 October 2013</ref> for launch in 2020.<ref name="Fobos-Grunt 2 launch in 2020">Template:Cite news</ref><ref name="RAS offer accepted">Template:Cite news</ref> Popovkin declared that they would soon attempt to repeat the Fobos-Grunt mission, if an agreement was not reached for Russian co-operation in the European Space Agency's ExoMars program.Template:Citation needed However, since an agreement was reached for the inclusion of Russia as a full project partner,<ref name='still keen'>Template:Cite news</ref> some instruments originally developed for Fobos-Grunt were flown in the ExoMars Trace Gas Orbiter.<ref>Template:Cite news</ref>
On 2 August 2014, the Russian Academy of Sciences stated that the Phobos-Grunt repeat mission might be restarted for a launch approximately in 2024.<ref>Template:Cite news</ref><ref name="repeat 2023">Template:Cite news</ref> In August 2015, the ESA-Roscosmos working group on post-ExoMars cooperation, completed a joint study for a possible future Phobos sample return mission, preliminary discussions were held,<ref name="Roscosmos 2015">Template:Cite news</ref><ref name="PS 2014">Template:Cite news</ref> and in May 2015 the Russian Academy of Sciences submitted a budget proposal.<ref name="Roscosmos 2015"/><ref name='Paving the way'>Fobos-Grunt 2: "Choosing the launch window" 8 October 2015 Accessed on 29 December 2015</ref>
As of September 2023, Roscosmos intended to launch Boomerang "after 2030".<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Boomerang is intended to be the first stage of the Russian Mars sample return mission called Mars-Grunt.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=Mars-Grunt>Template:Cite news</ref><ref>Template:Cite news</ref> This Mars sample-return mission would be developed from the technologies demonstrated by Fobos-Grunt-2.<ref name='Paving the way'/>
ObjectivesEdit
Fobos-Grunt was an intended interplanetary probe that included a lander to study Phobos and a sample return vehicle to return a sample of about Template:Cvt of soil to Earth.<ref name=laspace_fobos_grunt_sent_to_baikonur>Fobos-Grunt sent to Baikonur Template:Webarchive Template:In lang</ref> It was also to study Mars from orbit, including its atmosphere and dust storms, plasma and radiation.
- Science goals
- Delivery of samples of Phobos soil to Earth for scientific research of Phobos, Mars and Martian vicinity;
- In situ and remote studies of Phobos (to include analysis of soil samples);
- Monitoring the atmospheric behavior of Mars, including the dynamics of dust storms;
- Studies of the vicinity of Mars, including its radiation environment, plasma and dust;<ref name="ESA_PMR"/>
- Study of the origin of the Martian moons and their relation to Mars;
- Study of the role played by asteroid impacts in the formation of terrestrial planets;
- Search for possible past or present life (biosignatures);<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
- Study of the impact of a three-year interplanetary round-trip journey on extremophile microorganisms in a small sealed capsule (LIFE experiment).<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
PayloadEdit
- TV system for navigation and guidance (TSNN)<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
- Stereo camera pair
- Manipulator 1, with:
- Panoramic camera
- MicrOmega visible microscope<ref name="harvey"/>
- Mössbauer Spectrometer (MIMOS-II)<ref>Template:Cite journal</ref>
- Drill sampler (GZU)
- Manipulator 2, with:
- Panoramic camera 2
- Drill sampler (GZU 2)
- Penetration sampler (GZUP Chomik)<ref>Template:Citation</ref><ref>Template:Cite journal</ref>
- MicrOmega near-infrared microscope<ref>Template:Cite journal</ref>
- Gas Analysis Package:<ref name="esa_spacecraft"/>
- Thermal Differential Analyzer (TDA)
- Gas-Chromatograph (KhMS-1F)
- Mass-Spectrometer (MAL-1F)
- Gamma ray spectrometer (FOGS)<ref name="harvey">Template:Cite book</ref>
- Neutron & γ-ray spectrometer (NS HEND)<ref name="harvey"/>
- Laser Time-of-Flight Mass Spectrometer (LAZMA)
- Thermal Detector (TERMOFOB)
- Fourier Spectrometer (AOST)<ref name=korablev>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref><ref>Template:Cite journal</ref>
- Echelle Spectrometer (TIMM-2)<ref name=korablev/><ref>Template:Cite journal</ref>
- Seismogravimeter (GRAS-F)
- Seismometer (SEISMO)<ref name="harvey"/>
- Long-wave radar (DPR)<ref name="harvey"/>
- Dust counter (Meteor-F)<ref>Template:Cite journal</ref>
- Dosimeter (Liulin-F)
- Secondary Ion Mass Spectrometer (MANAGA-F)<ref name="harvey"/>
- Optical solar & star sensor (LIBRATsIYa)<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
- Plasma Complex (FPMS)
- Fluxgate magnetometer (DFM)
- Inductive magnetic sensor (KVD)
- Ion mass spectrometer (DIM)<ref>Template:Cite journal</ref>
- Ion mass spectrometer (DI)
- Ultrastable Oscillator (USO1)
- Ionospheric parameters experiment together with Yinghuo-1 (YH-1) spacecraft (MROE)
- BioPhobos/Anabioz
- BioPhobos/LIFE (Living Interplanetary Flight Experiment)
Mass summaryEdit
| Spacecraft components | Mass |
|---|---|
| Lander sample capsule | Template:Cvt |
| Earth return vehicle (tot.): | Template:Cvt |
| -Propellant (for trans-Earth injection maneuvers) | Template:Cvt |
| -Dry mass | Template:Cvt |
| Orbiter/lander instrument compartment | Template:Cvt |
| Orbiter/lander (tot.): | Template:Cvt |
| -Propellant (for Phobos rendezvous and landing) | Template:Cvt |
| -Dry mass | Template:Cvt |
| Phobos-Grunt/Yinghuo/MPU truss adapter | Template:Cvt |
| "Yinghuo 1" subsatellite | Template:Cvt |
| Main propulsion unit (MPU) stage, excluding external propellant tank: | Template:Cvt |
| -Propellant (for trans-Mars injection burn and initial Template:Cvt Mars orbit insertion) | Template:Cvt |
| -Dry mass | Template:Cvt |
| External propellant tank: | Template:Cvt |
| -Propellant (for Template:Cvt Earth parking orbit insertion) | Template:Cvt |
| -Dry mass | Template:Cvt |
| Total mass | Template:Cvt<ref name="galspace.spb.ru"/> |
Mission planEdit
JourneyEdit
The spacecraft's journey to Mars would take about ten months. After arriving in Mars orbit, the main propulsion unit and the transfer truss would separate and the Chinese Mars orbiter would be released. Fobos-Grunt would then spend several months studying the planet and its moons from orbit, before landing on Phobos. It was imperative to prevent the introduction to Mars of contaminants from Earth; according to Fobos-Grunt Chief Designer Maksim Martynov, the probability of the probe accidentally reaching the surface of Mars was much lower than the maximum specified for Category III missions, the type assigned to Fobos-Grunt and defined in COSPAR's planetary protection policy (in accordance with Article IX of the Outer Space Treaty).<ref name=rian_martynov_answers>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=cospar_ppp>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
On PhobosEdit
The planned landing site at Phobos was a region from 5°S to 5°N, 230° to 235°E.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Soil sample collection would begin immediately after the lander touched down on Phobos, with collection lasting 2–7 days. An emergency mode existed for the case of communications breakdown, which enabled the lander to automatically launch the return rocket to deliver the samples to Earth.<ref name="ASMp2"/>
A robotic arm would have collected samples up to Template:Cvt in diameter. At the end of the arm was a pipe-shaped tool which split to form a claw. The tool contained a piston which would have pushed the sample into a cylindrical container. A light-sensitive photo-diode would have confirmed whether material collection was successful and also allowed visual inspection of the digging area. The sample extraction device would have performed 15 to 20 scoops yielding a total of Template:Cvt of soil.<ref name="ASMp2">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The samples would be loaded into a capsule which would then be moved inside a special pipeline into the descent module by inflating an elastic bag within the pipe with gas.<ref name=rian_martynov_answers/> Because the characteristics of Phobos soil are uncertain, the lander included another soil-extraction device, a Polish-built drill, which would have been used in case the soil turned out to be too rocky for the main scooping device.<ref name="universetoday_daring"/><ref name="zak_bbc_rebirth"/>
After the departure of the return stage, the lander's experiments would have continued in situ on Phobos' surface for a year. To conserve power, mission control would have turned these on and off in a precise sequence. The robotic arm would have placed more samples in a chamber that would heat it and analyze its emission spectra. This analysis might have been able to determine the presence of volatile compounds, such as water.<ref name="ASMp2"/>
Sample return to EarthEdit
The return stage was mounted on top of the lander. It would have needed to accelerate to Template:Cvt to escape Phobos' gravity. In order to avoid harming the experiments remaining at the lander, the return stage would have ignited its engine once the vehicle had been vaulted to a safe height by springs. It would then have begun maneuvers for the eventual trip to Earth, where it would have arrived in August 2014.<ref name="ASMp2"/> An 11-kg descent vehicle containing the capsule with soil samples (up to Template:Cvt) would have been released on direct approach to Earth at Template:Cvt.<ref name="esa_spacecraft">Phobos Soil – Spacecraft European Space Agency</ref> Following the aerodynamic braking to Template:Cvt the conical descent vehicle would perform a hard landing without a parachute within the Sary Shagan test range in Kazakhstan.<ref name=rian_martynov_answers/><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The vehicle did not have any radio equipment.<ref name="universetoday_daring"/> Ground-based radar and optical observations would have been used to track the vehicle's return.<ref name="zak_phobos_grunt_scenario">The mission scenario of the Phobos-Grunt project Anatoly Zak</ref>
Summary of intended mission phasesEdit
| Event | Date | Notes<ref name="galspace.spb.ru"/> |
|---|---|---|
| Departure from Earth orbit | 28 October – 21 November 2011 | Three course corrections of up to 130 m/s delta V foreseen during Earth-Mars cruise |
| Mars arrival | 25 August – 26 September 2012 | 945 m/s braking burn to enter initial Mars parting orbit with periapsis = 800 ± 400 km, apoapsis = 79,000 km and period of three days. Propulsion module and Yinghuo-1 separates from the rest of the craft. |
| Transfer to intermediate Mars orbit | October – December 2012 | 220 m/s engine burn to raise periapsis to 6499 km, changing the orbital period to 3.3 days and the orbital inclination to that of Phobos. |
| Transfer to Phobos observation orbit | December 2012 | 705 m/s engine burn to insert the craft into an early circular orbit with an average radius of 9910 km, i.e. about 535 km above Phobos orbit, and orbital period = 8.3 h. |
| Rendezvous with Phobos | January 2013 | 45 m/s + 20 m/s engine burns for transfer to quasi-synchronous orbit where the probe always remains within 50..140 km of Phobos. |
| Phobos landing and surface activities | End of January – beginning of April 2013 | Landing maneuver takes two hours (100 m/s delta V trajectory changes). |
| Separation of Earth return vehicle (ERV) from lander | April 2013 | 10 m/s + 20 m/s trajectory change to enter parking orbit 300–350 km lower than Phobos with a period of 7.23 hours. |
| ERV transfer orbit | Starting in August 2013 | 740 m/s periapsis burn for insertion into 3-day elliptical transfer orbit. |
| ERV pre orbit insertion | Mid-August 2013 | 125 m/s burn to change the inclination of the orbit while decreasing the periapsis distance to 500–1000 km above the martian surface. |
| ERV trans-Earth injection burn | 3–23 September 2013 | Final 790 m/s engine burn to accelerate out of Mars orbit. |
| ERV Earth arrival | 15–18 August 2014 | Up to five trajectory corrections (combined delta V < 130 m/s) would be performed before atmospheric entry. |
Ground controlEdit
The mission control center was located at the Center for Deep Space Communications (Национальный центр управления и испытаний космических средств Template:In lang, equipped with RT-70 radio telescope near Yevpatoria in Crimea.<ref>Russian spacecraft for Fobos-Grunt program to be controlled from Yevpatoria, Kyiv Post (25 June 2010)</ref> Russia and Ukraine agreed in late October 2010 that the European Space Operations Centre in Darmstadt, Germany, would have controlled the probe.<ref name=tass102511>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Communications with the spacecraft on the initial parking orbit are described in a two-volume publication.<ref>Fobos-Grunt sample return mission. Template:WebarchiveTemplate:In lang</ref>
Scientific critiquesEdit
Barry E. DiGregorio, Director of the International Committee Against Mars Sample Return (ICAMSR), criticised the LIFE experiment carried by Fobos-Grunt as a violation of the Outer Space Treaty due to the possibility of contamination of Phobos or Mars with the microbial spores and live bacteria it contains should it have lost control and crash-landed on either body.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> It is speculated that the heat-resistant extremophile bacteria could survive such a crash, on the basis that Microbispora bacteria survived the Space Shuttle Columbia disaster.<ref>Template:Cite journal</ref>
According to Fobos-Grunt Chief Designer Maksim Martynov, the probability of the probe accidentally reaching the surface of Mars was much lower than the maximum specified for Category III missions, the type assigned to Fobos-Grunt and defined in COSPAR's planetary protection policy (in accordance with Article IX of the Outer Space Treaty).<ref name="rian_martynov_answers"/><ref name="cospar_ppp"/>
See alsoEdit
ReferencesEdit
Further readingEdit
External linksEdit
Template:Mars spacecraft Template:Russian space program Template:Astrobiology Template:Orbital launches in 2011