21 July 1973, 19:30:59 (1973-07-21UTC19:30:59Z) UTC[3]
Rocket
Proton-K/D
Launch site
Baikonur 81/23
End of mission
Last contact
10 February 1974, 15:38 UTC
Orbital parameters
Reference system
Heliocentric[4]
Perihelion altitude
1.02 AU
Aphelion altitude
1.63 AU
Inclination
2.2°
Period
556 days
Flyby of Mars (failed orbiter)
Closest approach
10 February 1974, 15:34 UTC
Distance
1,844 km (1,146 mi)
Mars program
← Mars 3
Mars 5 →
Mars 4 (Russian: Марс-4), also known as 3MS No.52S was a Soviet spacecraft intended to explore Mars. A 3MS spacecraft launched as part of the Mars programme, it was intended to enter orbit around Mars in 1974. However, computer problems prevented orbital insertion from occurring.[5]
^Krebs, Gunter. "Interplanetary Probes". Gunter's Space Page. Retrieved 12 April 2013.
^"Mars 4". NASA. Retrieved 6 December 2018.
^McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 12 April 2013.
^Mark Wade. "Mars M-73". Encyclopedia Astronautica. Retrieved 26 May 2024.
^"Mars 4". US National Space Science Data Centre. Retrieved 12 April 2013.
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