Soyuz T-4

Soyuz T-4 was a Soviet space mission which launched the crew of Salyut 6 EO-6, the sixth and final long-duration crew of the Salyut 6 space station. It was launched on 12 March 1981 and docked with the station the next day. During their stay, the EO-6 crew was visited by Soyuz 39 and Soyuz 40. Soyuz T-4 returned to Earth on 26 May 1981; its crew were the last to have inhabited Salyut 6.

Soyuz T-4
COSPAR ID1981-023A
SATCAT no.12334
Mission duration74 days, 17 hours, 37 minutes, 23 seconds
Orbits completed1,178
Spacecraft properties
Spacecraft typeSoyuz-T
ManufacturerNPO Energia
Launch mass6,850 kilograms (15,100 lb)
Crew
Crew size2
MembersVladimir Kovalyonok
Viktor Savinykh
CallsignPhoton
Start of mission
Launch date12 March 1981, 19:00:11 (1981-03-12UTC19:00:11Z) UTC
RocketSoyuz-U
Launch siteBaikonur 1/5
End of mission
Landing date26 May 1981, 12:37:34 (1981-05-26UTC12:37:35Z) UTC
Landing site125 kilometres (78 mi) E Dzhezkazgan
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude201 kilometres (125 mi)
Apogee altitude250 kilometres (160 mi)
Inclination51.6 degrees
Period88.7 minutes
Docking with Salyut 6
Docking date13 March 1981, 20:33 (1981-03-13UTC20:33Z) UTC
Undocking date26 May 1981, 09:20 (1981-05-26UTC09:21Z) UTC
Soyuz programme
(Crewed missions)
 
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