Soyuz T-4

Soyuz T-4

Infobox Space mission
mission_name = Soyuz T-4
sign = Photon
crew_members = 2
launch = March 12, 1981
19:00:11 UTC
Gagarin's Start
landing = May 26, 1981
12:37:34 UTC
125 km E Dzhezkazgan
duration = 74d/17:37:23
orbits = 1178
next = Soyuz 39
previous = Soyuz T-3 |

Crew

Number in parentheses indicates number of spaceflights by each individual prior to and including this mission.
*Vladimir Kovalyonok (3) - Commander
*Viktor Savinykh (1) - Flight Engineer

Backup crew

*Vyacheslav Zudov - Commander
*Boris Andreyev - Flight Engineer

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.


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