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|Mission duration||90 days, 11 hours, 46 minutes|
|Spacecraft type||Soyuz 7K-T/A9|
|Launch mass||6,570 kilograms (14,480 lb)|
|Start of mission|
|Launch date||November 17, 1975, 14:38:00UTC|
|Launch site||Baikonur 1/5|
|End of mission|
|Landing date||February 16, 1976, 02:24:00UTC|
|Landing site||56 kilometres (35 mi) SW of Arkalyk|
|Perigee||177 kilometres (110 mi)|
|Apogee||251 kilometres (156 mi)|
|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.
It was recovered on February 16, 1976.
- Mass: 6,570 kg (14,480 lb)
- Perigee: 177 km (110 mi)
- Apogee: 251 km (156 mi)
- Inclination: 51.6°
- Period: 89.1 minutes
- "Baikonur LC1". Encyclopedia Astronautica. Retrieved 2009-03-04.