Soyuz T-4

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Soyuz T-4
Mission statistics
Mission name	Soyuz T-4
Crew size	2
Call sign	Photon
Launch date	March 12, 1981 19:00:11 UTC Gagarin's Start
Landing	May 26, 1981 12:37:34 UTC 125 km E Dzhezkazgan
Mission duration	74d/17:37:23
Number of orbits	1178
Related missions
Previous mission Next mission Soyuz T-3 Soyuz 39

Contents 1 Crew 1.1 Backup crew 2 Mission parameters 3 Mission highlights

[edit] 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

[edit] Backup crew

• Vyacheslav Zudov - Commander
• Boris Andreyev - Flight Engineer

[edit] Mission parameters

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

[edit] 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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