 | |
| Mission type | Mars flyby/lander[1] |
|---|---|
| Operator | Soviet space program |
| COSPAR ID | 1973-052A 1973-052E |
| SATCATno. | 6768[2] 7223 |
| Mission duration | 218 days, 15 hours and 25 minutes |
| Spacecraft properties | |
| Spacecraft | 3MP No.50P |
| Manufacturer | NPO Lavochkin |
| Launch mass | 3,260 kg (7,190 lb)[2] |
| Landing mass | 635 kg (1,400 lb) |
| Start of mission | |
| Launch date | 5 August 1973, 17:45:48 (1973-08-05UTC17:45:48Z) UTC[3] |
| Rocket | Proton-K/D |
| Launch site | Baikonur81/23 |
| Contractor | Khrunichev |
| End of mission | |
| Last contact | Lander: 12 March 1974, 09:11:05 (1974-03-12UTC09:11:06Z) UTC |
| Orbital parameters | |
| Reference system | Heliocentric[4] |
| Perihelion altitude | 1.01 AU |
| Aphelion altitude | 1.67 AU |
| Inclination | 2.2° |
| Period | 567 days |
| Flyby ofMars | |
| Spacecraft component | Bus |
| Closest approach | 12 March 1974, 09:05:53 UTC |
| Distance | 1,600 km (990 mi) |
| Mars impact(failed landing) | |
| Spacecraft component | Lander |
| Impact date | 12 March 1974, 09:11 UTC |
| Impact site | 23°54′S19°25′W / 23.90°S 19.42°W /-23.90; -19.42 |
Mars 6 (Russian:Марс-6), also known as3MP No.50P was aSoviet spacecraft launched to explore Mars. A 3MP bus spacecraft launched as part of theMars program, it consisted of a lander, and a coast stage with instruments to study Mars as it flew past.
The Mars 6 spacecraft carried an array of instruments to study Mars. The lander was equipped with a thermometer and barometer to determine the surface conditions, an accelerometer and radio altimeter for descent, and instruments to analyse the surface material including amass spectrometer.[5] The coast stage, or bus, carried amagnetometer, plasma traps, cosmic ray and micrometeoroid detectors, and an instrument to studyproton andelectronfluxes from theSun.[5]
Built by Lavochkin, Mars 6 was the first of two 3MP spacecraft launched to Mars in 1973 and was followed byMars 7. Two orbiters,Mars 4 andMars 5, were launched earlier in the 1973 Mars launch window and were expected to relay data for the two landers. However, Mars 4 failed to enter orbit, and Mars 5 failed after a few days in orbit.
Mars 6 was launched by a Proton-K carrier rocket with aBlok D upper stage, flying fromBaikonur Cosmodrome Site 81/23.[3] The launch occurred at 17:45:48 UTC on 5 August 1973, with the first three stages placing the spacecraft and upper stage into alow Earthparking orbit before the Blok D fired to propel Mars 6 into heliocentric orbit bound for Mars. The spacecraft performed a course correction on 13 August 1973.
Mars 6's lander separated from the flyby bus on 12 March 1974 at an altitude of 48,000 kilometres (30,000 mi) from the surface of Mars. The bus made a flyby with a closest approach of 1,600 kilometres (990 mi). The lander encountered the atmosphere of Mars at 09:05:53 UTC, slowing from 5,600 to 600 metres per second (12,500 to 1,300 mph) as it passed through the upper atmosphere. A parachute was then deployed to further slow the probe's descent, andretrorockets were intended to fire during the last seconds before the probe reached the ground.
The spacecraft returned data for 224 seconds during its descent through the Martian atmosphere. However, at 09:11:05 UTC, with the spacecraft about to fire its retrorockets in preparation for landing, all contact was lost. Due to a design flaw, a chip aboard the spacecraft had degraded during the mission, and a large amount of the data which had been returned was unusable.[2]
| Rovers |  | |
|---|---|---|
| Helicopter | ||
| Landers | ||
| Memorial sites | ||
| Sample depots | ||
† indicates a mission failure (no significant data returned from the surface). | ||
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