| COSPAR ID | 1977-099A |
|---|---|
| SATCAT no. | 10401 |
| Mission duration | 2 days, 44 minutes, 45 seconds |
| Orbits completed | 32 |
| Spacecraft properties | |
| Spacecraft type | Soyuz 7K-T |
| Manufacturer | NPO Energia |
| Launch mass | 6,860 kilograms (15,120 lb) |
| Crew | |
| Crew size | 2 |
| Members | Vladimir Kovalyonok Valery Ryumin |
| Callsign | Фотон (Foton - "Photon" |
| Start of mission | |
| Launch date | October 9, 1977, 02:40:35 UTC |
| Rocket | Soyuz-U |
| Launch site | Baikonur 1/5[1] |
| End of mission | |
| Landing date | October 11, 1977, 03:25:20 UTC |
| Landing site | 185 kilometres (115 mi) NW of Tselinograd |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 198.5 kilometres (123.3 mi) |
| Apogee altitude | 258.1 kilometres (160.4 mi) |
| Inclination | 51.66 degrees |
| Period | 88.66 minutes |
Soyuz programme (Crewed missions) | |
Soyuz 25 (Russian: Союз 25, Union 25) was an October, 1977, Soviet crewed space flight, the first to the new Salyut 6 space station, which had been launched 10 days earlier. However, the mission was aborted when cosmonauts Vladimir Kovalyonok and Valery Ryumin failed to engage the docking latches of the station despite five attempts. Lacking sufficient fuel to attempt a dock at the other end of the station and with battery power for only two days, they returned to Earth.[2]
The failure led to a new rule whereby every crew had to have at least one person aboard who had previously flown in space.[3]
- ^ "Baikonur LC1". Encyclopedia Astronautica. Archived from the original on 2009-04-15. Retrieved 2009-03-04.
- ^ The mission report is available here: http://www.spacefacts.de/mission/english/soyuz-25.htm
- ^ Cite error: The named reference
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