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Soyuz T-4 was a
Soviet The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the 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 The Soyuz 40 mission was a 1981 Soviet Union, Soviet human spaceflight, crewed spaceflight and the final flight of the Soyuz 7K-T spacecraft. It was a collaboration between the Soviet Union and Romania. Crew Backup crew Mission parameters *M ...
. Soyuz T-4 returned to Earth on 26 May 1981; its crew were the last to have inhabited Salyut 6.


Crew


Backup crew


Mission parameters

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


Mission highlights

The docking with Salyut 6 was delayed after the Soyuz's onboard Argon computer determined it would occur outside radio range with the TsUP. Despite this, the docking occurred successfully on 13 March 1981. The Progress 12 spacecraft was already docked to the station by the time the crew arrived, and they spent several days unloading the Progress before its undocking on 19 March. This freed the remaining docking port for the arrival of the Soyuz 39/EP-9 crew on 22 March. In mid-May, Kovalyonok and Savinykh replaced the spacecraft's 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. The EO-6 crew undocked from Salyut 6 on 26 May, leaving behind the Soyuz's orbital module. Soyuz T-4 landed over three hours later, touching down east of Dzhezkazgan, Kazakh SSR.


See also

* List of human spaceflights to Salyut space stations * List of Salyut expeditions


References

{{DEFAULTSORT:Soyuz T-04 Crewed Soyuz missions Spacecraft launched in 1981 1981 in the Soviet Union Spacecraft which reentered in 1981