Soyuz 20

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Soyuz 20
COSPAR ID1975-106A
SATCAT no.08430
Mission duration90 days, 11 hours, 46 minutes
Orbits completed1470
Spacecraft properties
Spacecraft typeSoyuz 7K-T/A9
ManufacturerNPO Energia
Launch mass6,570 kilograms (14,480 lb)
Start of mission
Launch dateNovember 17, 1975, 14:38:00 (1975-11-17UTC14:38Z) UTC
Launch siteBaikonur 1/5[1]
End of mission
Landing dateFebruary 16, 1976, 02:24:00 (1976-02-16UTC02:25Z) UTC
Landing site56 kilometres (35 mi) SW of Arkalyk
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude177 kilometres (110 mi)
Apogee altitude251 kilometres (156 mi)
Inclination51.6 degrees
Period89.1 minutes
Docking with Salyut 4
Soyuz programme
(Manned missions)

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.

It was reentered on 16 February 1976.



Mission parameters[edit]

  • Mass: 6,570 kg (14,480 lb)
  • Perigee: 177 km (110 mi)
  • Apogee: 251 km (156 mi)
  • Inclination: 51.6°
  • Period: 89.1 minutes


  1. ^ "Baikonur LC1". Encyclopedia Astronautica. Archived from the original on 2009-04-15. Retrieved 2009-03-04.