Soyuz T-4
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| 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
- Vladimir Kovalyonok (3)
- Viktor Savinykh (1)
(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 |