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Soyuz 20
Mission typeTest flight
OperatorSoviet space program
COSPAR ID1975-106A
SATCAT no.08430
Mission duration90 days 11 hours 47 minutes
Orbits completed1470
Spacecraft properties
SpacecraftSoyuz 7K-T No.8
Spacecraft typeSoyuz 7K-T/A9
ManufacturerNPO Energia
Launch mass6570 kg [1]
Landing mass2800 kg
Dimensions7.13 m long
2.72 m wide
Start of mission
Launch date17 November 1975,
14:36:37 UTC
Launch siteBaikonur, Site 1/5 [2]
End of mission
Landing date16 February 1976, 02:24 UTC
Landing site56 km at the southwest of Arkalyk, Kazakhstan
Orbital parameters
Reference systemGeocentric orbit [3]
RegimeLow Earth orbit
Perigee altitude199.7 km
Apogee altitude263.5 km
Period88.8 minutes
Docking with Salyut 4

Soyuz 20 (Russian: Союз 20, Union 20) was an unmanned spacecraft launched by the Soviet Union. It was a long-duration test of the Soyuz spacecraft that docked with the Salyut 4 space station. Soyuz 20 performed comprehensive checking of improved on-board systems of the spacecraft under various flight conditions. It also carried a biological payload. Living organisms were exposed to three months in space.



Mission parameters

  • Mass: 6,570 kg (14,480 lb) [1]
  • Perigee: 199.7 km (124.1 mi)[3]
  • Apogee: 263.5 km (163.7 mi)
  • Inclination: 51.6°
  • Period: 88.8 minutes


It was recovered on 16 February 1976 at 02:24 UTC.[1]


  1. ^ a b c "Display: Soyuz 20 1975-106A". NASA. 14 May 2020. Retrieved 13 October 2020. This article incorporates text from this source, which is in the public domain.
  2. ^ "Baikonur LC1". Encyclopedia Astronautica. Archived from the original on 15 April 2009. Retrieved 4 March 2009.
  3. ^ a b "Trajectory: Soyuz 20 1975-106A". NASA. 14 May 2020. Retrieved 13 October 2020. This article incorporates text from this source, which is in the public domain.
This page was last edited on 17 February 2021, at 19:50
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