Yinghuo-1

Yinghuo-1

Yinghuo-1 marked label 3
Mission type	Mars orbiter
Operator	CNSA
Mission duration	1 year in Mars orbit (planned) Never departed Earth orbit
Spacecraft properties
Launch mass	115 kilograms (254 lb)[1]
Dimensions	750mm x 750mm x 650mm (stowed)[1]
Power	90 W, solar array
Start of mission
Launch date	8 November 2011, 20:16:03 (2011-11-08UTC20:16:03Z) UTC[2][3][4]
Rocket	Zenit-2M
Launch site	Baikonur 45/1
Deployed from	Fobos-Grunt (planned)
End of mission
Decay date	15 January 2012 (2012-01-16)[5]
Orbital parameters
Reference system	Areocentric (planned) Geocentric (achieved)
Regime	Low Earth (achieved)
Perigee altitude	800 kilometres (500 mi) (planned)
Apogee altitude	80,000 kilometres (50,000 mi) (planned)
Inclination	5 degrees (planned)
Period	3 days (planned)

Yinghuo-1 (simplified Chinese: 萤火一号; traditional Chinese: 螢火一號; pinyin: Yínghuǒ yī hào) was a Chinese Mars-exploration space probe, intended to be the first Chinese planetary space probe and the first Chinese spacecraft to orbit Mars. It was launched from Baikonur Cosmodrome, Kazakhstan, on 8 November 2011, along with the Russian Fobos-Grunt sample return spacecraft, which was intended to visit Mars' moon Phobos.^[2][6] The 115-kg (250-lb) Yinghuo-1 probe was intended by the CNSA to orbit Mars for about two years,^[1] studying the planet's surface, atmosphere, ionosphere and magnetic field.^{[citation needed]} Shortly after launch, Fobos-Grunt was expected to perform two burns to depart Earth orbit bound for Mars. However, these burns did not take place, leaving both probes stranded in orbit.^[7] On 17 November 2011, CNSA reported that Yinghuo-1 had been declared lost.^[8] After a period of orbital decay, Yinghuo-1 and Fobos-Grunt underwent destructive re-entry on 15 January 2012, finally disintegrating over the Pacific Ocean.^[5][9]

As a result, CNSA subsequently moved to embark on an independent Mars exploration program, which culminated in the Tianwen-1 orbiter-lander-rover mission that successfully landed the Zhurong rover on Mars on 22 May, 2021.^[10]

Name

Yinghuo-1's name (simplified Chinese: 萤火; traditional Chinese: 螢火; pinyin: yínghuǒ – firefly, literally "luminous fire") was a tribute to the near-homophone yinghuo (simplified Chinese: 荧惑; traditional Chinese: 熒惑; pinyin: yínghuò). This word, a short form of "shimmering planet" (熒惑星), is an ancient Chinese name for Mars.

Background

On 26 March 2007, the director of the China National Space Administration, Sun Laiyan, and the head of the Russian Space Agency, Anatoly Perminov, signed a landmark space co-operation accord, entitled the "Cooperative Agreement between the China National Space Administration and the Russian Space Agency on joint Chinese-Russian exploration of Mars". One stipulation of the agreement was the construction and launch of the Yinghuo Mars orbiter and its Russian counterpart, Fobos-Grunt.^[4]

Instruments and objectives

Yinghuo-1's primary scientific objectives were:

1. To conduct detailed investigation of the plasma environment and magnetic field around Mars.
2. To study Martian ion escape processes and their possible mechanisms
3. To conduct ionosphere occultation measurements between Yinghuo-1 and Fobos-Grunt, focusing on the sub-solar and midnight regions.
4. To observe sandstorms on the Martian surface.

The probe's science payload consisted of four instrument:^[11][12]

1. A plasma package, consisting of an electron analyzer, ion analyzer and mass spectrometer.
2. A fluxgate magnetometer.
3. A radio-occultation sounder.
4. An optical imaging system consisting of two cameras with 200 m (660 ft) resolution for high-quality images of the Martian surface to be captured from orbit.

Mission profile

Following its transit to Mars, Yinghuo-1 was planned to separate from Fobos-Grunt in October 2012^[13] and enter a 72.8-hour equatorial Martian orbit,^[1] with an orbital inclination of approximately 5 degrees.^{[citation needed]} Fobos-Grunt and Yinghuo-1 would have conducted Mars ionosphere occultation experiments together,^[14] although Fobos-Grunt's primary objective was to obtain surface samples from the Martian moon Phobos. Yinghuo-1 would have experienced periods of up to 8.8 hours in darkness when its orbit carried it over Mars' nightside; it would have run on battery power during these periods, as its solar panels would have been unusable without direct sunlight.^[1]

Launch processing

On 17 October 2011, the completed Yinghuo-1 satellite arrived at Baikonur Cosmodrome with Fobos-Grunt, beginning payload processing operations in preparation for its November launch.^[15]

Launch and orbital burn failure

China's Yinghuo-1 and the Russian Fobos-Grunt spacecraft were launched together aboard a Ukrainian Zenit rocket with a Fregat upper stage from Baikonur Cosmodrome, Kazakhstan, on 8 November 2011.^[2][13] Shortly after launch, Fobos-Grunt was expected to perform two burns to depart Earth orbit and begin its journey to Mars. However, these burns did not take place, stranding the two spacecraft in their parking orbit.^[16] Despite repeated efforts to contact the launcher and rectify the problem, the spacecraft continued to lose altitude.^[17] On 17 November, Chinese state media formally declared the Yinghuo-1 probe lost,^[8] and the launcher's orbit gradually began to decay.

Destructive re-entry

On 14 January 2012, it was reported that Fobos-Grunt and Yinghuo-1 were beginning their final descent into Earth's atmosphere, falling at a rate of several hundred metres per hour from their 147-kilometre (91 mi) orbital altitude.^[9] The two spacecraft completed their re-entry and disintegrated over the Pacific Ocean on 15 January 2012.^[5]

Specifications

• Length: 0.75 metres (2.5 ft) (excluding solar panels).^[18]
• Width: 0.75 metres (2.5 ft).^[18]
• Height: 0.6 metres (2.0 ft).^[18]
• Mass: 115 kilograms (254 lb).^[14]
• Power: 3-axis stabilised, 2×3 section solar array with a full-extended length of 5.6 metres (18 ft), providing average power of 90 W, and peak power of 180 W.^[14]
• HGA: 950 mm antenna dish (S-band) with a 12 W transmitter in two frequencies (8.4 and 7.17 GHz) and a data rate between 8 bit/s and 16 kbit/s.^[14]
• LGA: 80 bit/s data rate.^[14]

See also

• Tianwen-1 – Interplanetary mission by China to place an orbiter, lander, and rover on Mars
• Chinese Lunar Exploration Program – Lunar research program (2004 – present)
• List of missions to Mars

References

Further reading

• Zheng, Wei; Hsu, Houtse; Zhong, Min; Yun, Meijuan (2011). "China's first-phase Mars Exploration Program: Yinghuo-1 orbiter". Planetary and Space Science. 86: 155–159. Bibcode:2013P&SS...86..155Z. doi:10.1016/j.pss.2011.02.008.

External links

• Fobos-Grunt at Spacefiles.com Archived 14 February 2018 at the Wayback Machine. Includes an image of Yinghuo-1.

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Spacecraft missions to Mars

• List of missions to Mars
• List of Mars orbiters
• List of artificial objects on Mars

Active

Orbiters	2001 Mars Odyssey Mars Express Mars Reconnaissance Orbiter timeline MAVEN ExoMars Trace Gas Orbiter Hope Tianwen-1 orbiter
Rovers	Curiosity Mars Science Laboratory timeline Perseverance Mars 2020 timeline

Past

Flybys	Mars 1† Mariner 4 Zond 2† Mariner 6 and 7 Mars 6 Mars 7 Rosetta Dawn Mars Cube One (MarCO) Psyche (2023, flyby in 2026)
Orbiters	Mars 2 Mars 3 Mariner 9 Mars 4† Mars 5 Viking program Viking 1 Viking 2 Phobos program Phobos 1† Phobos 2† Mars Observer† Mars Global Surveyor Nozomi† Mars Climate Orbiter† Mangalyaan
Landers	Mars 2† Mars 3† Mars 6† Mars 7† Viking 1 Viking 2 Mars Pathfinder Mars Polar Lander† / Deep Space 2† Beagle 2† Phoenix ExoMars Schiaparelli† InSight Tianwen-1 lander
Rovers	PrOP-M† Sojourner Mars Exploration Rover Spirit timeline Opportunity timeline Zhurong
Aircraft	Ingenuity helicopter flights Mars 2020

Failed launches	Mars 1M No.1 1M No.2 2MV-4 No.1 2MV-3 No.1 Mariner 3 Mars 2M No.521 2M No.522 Mariner 8 Mars 3MS No.170 Mars 96 Fobos-Grunt / Yinghuo-1

Future

Planned	Mangalyaan-2 (2024) Europa Clipper (2024, flyby in 2025) EscaPADE (2024) Tera-hertz Explorer (TEREX) (mid 2020s) Martian Moons eXploration (MMX) (2026) ExoMars (Rosalind Franklin) (2028) NASA-ESA Mars Sample Return Mars Sample Recovery Helicopters Kazachok
Proposed	Biological Oxidant and Life Detection DePhine Icebreaker Life Mars Aerial and Ground Global Intelligent Explorer Mars Base Alpha Mars Exploration Ice Mapper Mars Geyser Hopper Mars-Grunt Mars Micro Orbiter MELOS rover MetNet Next Mars Orbiter PADME Phootprint Sky-Sailor

Cancelled proposals	Aerial Regional-scale Environmental Survey Astrobiology Field Laboratory Beagle 3 Marsokhod Mars 4NM & 5NM Mars 5M (Mars-79) Mars-Aster Mars Astrobiology Explorer-Cacher (MAX-C) Mars One Mars Surveyor Lander Mars Telecommunications Orbiter NetLander Northern Light Red Dragon Sample Collection for Investigation of Mars (SCIM) Vesta Voyager Mars

Exploration

Concepts	Flyby Orbiter Landing Atmospheric entry Rover Aircraft Sample return Human mission Permanent settlement Colonization Terraforming
Strategies	Mars Scout Program Mars Exploration Program Mars Exploration Joint Initiative Mars Next Generation
Advocacy	The Mars Project The Case for Mars Inspiration Mars Mars Institute Mars Society Mars race

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