Soyuz 25

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Soyuz 25
Mission statistics
Mission name Soyuz 25
Crew size 2
Call sign Photon
Launch date October 9, 1977
02:40:35 UTC
Gagarin's Start
Landing October 11, 1977
03:25:20 UTC
185 km NW of Tselinograd
Mission duration 2d/00:44:45
Number of orbits 32
Related missions
Previous mission Next mission
Soyuz 24 Soyuz 26

[edit] Crew

Number in parentheses indicates number of spaceflights by each individual prior to and including this mission.

[edit] Backup crew

[edit] Mission parameters

  • Mass: 6860 kg
  • Perigee: 198.5 km
  • Apogee: 258.1 km
  • Inclination: 51.66°
  • Period: 88.66 minutes

Soyuz 25 was a Soviet human spaceflight launched October 9, 1977. It was meant to be the first mission to the Salyut 6 space station but failed after a problem with the docking system. On board were Vladimir Kovalyonok and Valery Ryumin. Their callsign for the mission was Foton (Photon).

All went well right up until docking. But for some reason the spacecraft would not hard dock. As the news release stated:

  • "At 07.09 Moscow time today (10 October, 1977) the automatic rendezvous of the Soyuz 25 ship and the Salyut 6 station was begun(sic). From a distance of 120 metres, the vehicles performed a docking manoeuvre. Due to deviations from the planned procedure for docking, the link-up was called off. The crew has begun making preparations for a return to Earth."

The hard docking was needed for the enabling of electrical connections. The spacecraft then retracted itself and formed a tight seal. The problem was traced later to a faulty mechanism on the Soyuz but this was not discovered until after the Soyuz 26 flight, who performed an EVA to inspect the second docking port on Salyut 6. Because the crew were flying the Soyuz 7K-T spacecraft there was only battery power available for a short two day mission. The crew were forced to re-enter and landed 185 km northwest of Tselinograd, Kazakhstan.

This failure resulted in a rule stating that crews had to have at least one crew member who had flown before. This resulted in the all-rookie backup crew of Aleksandr Ivanchenkov and Yuri Romanenko being paired with veteran cosmonauts for later missions.

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Soyuz 7K-TM (1975–1976)
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