Soyuz T-4

Soyuz T-4
Mission Statistics
Mission Name:Soyuz T-4
Call Sign:Photon
Number of Crew Members: 2
Launch:March 12, 1981
19:00:11 UTC
Baikonur LC1
Landing:May 26, 1981
12:37:34 UTC
125 km E Dzhezkazgan
Duration:74 days 17 hours 37 minutes 23 seconds
Number of Orbits: 1178

Crew

(1) number of spaceflights each crew member has completed, including this mission.

Mission parameters

  • Mass: 6850 kg
  • Perigee: 201 km
  • Apogee: 250 km
  • Inclination: 51.6°
  • Period: 88.7 minutes

Mission highlights

14th expedition to Salyut 6.

Docking with Salyut 6 delayed after the onboard Argon computer determined it would occur outside of radio range with the TsUP. In mid-May, Kovalyonok and Savinykh replaced the Soyuz-T 4 probe with a Salyut drogue. This may have been an experiment to see if a Soyuz-T docked to a space station could act as a rescue vehicle in the event that an approaching Soyuz-T equipped with a probe experienced docking difficulties and could not return to Earth.


Previous Mission:
Soyuz T-3
Soyuz programme Next Mission:
Soyuz 39
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