Encyclopedia Astronautica
Soyuz 25

Crew: Kovalyonok, Ryumin. Manned two crew. Unsuccessful mission. Failed to dock with Salyut 6 due to damage to spacecraft's docking mechanism. Backup crew: Ivanchenkov, Romanenko.

Manned two crew. Unsuccessful mission. Failed to dock with Salyut 6. Recovered October 11, 1977 3:25 GMT.

Narrative (adapted from D S F Portree's Mir Hardware Heritage, NASA RP-1357, 1995)

Soyuz 25 achieved soft dock with the new Salyut 6 station, inserting its probe apparatus into the conical drogue of the Salyut 6 front port. Hard docking involved retracting the probe to pull the station and spacecraft docking collars together. However, the docking collars would not latch. Cosmonauts Vladimir Kovalyonok and Valeri Ryumin had to return to Earth before their ferry's batteries became depleted. Engineers theorized that the Salyut 6 forward port might have been damaged during ascent, or that the Soyuz 25 docking unit was at fault. If the latter was true (and they could not be certain, because the docking unit was discarded before reentry, along with the Soyuz 25 orbital module), then it was possible that the several hard docking attempts had damaged the Salyut 6 forward port, making it unfit for future dockings.

AKA: Foton (Photon).
First Launch: 1977.10.09.
Last Launch: 1977.10.11.
Duration: 2.03 days.

More... - Chronology...

Associated People
  • Ryumin Ryumin, Valeri Viktorovich (1939-) Russian engineer cosmonaut. Flew on Soyuz 25, Salyut 6 EO-3, Salyut 6 EO-4, STS-91. Was married to astronaut Yelena Kondakova. 371 cumulative days in space. Civilian Engineer, Korolev OKB More...
  • Ivanchenkov Ivanchenkov, Aleksandr Segeyevich (1940-) Russian engineer cosmonaut. Flew on Salyut 6 EO-2, Salyut 7 EP-1. Graduated MAI, 1964 Civilian Engineer, Korolev OKB. Trained for a Buran flight. From 1993 served as deputy director of 29th Department, RKK Energia. More...
  • Kovalyonok Kovalyonok, Vladimir Vasilyevich (1942-) Belarusian pilot cosmonaut. Flew on Soyuz 25, Salyut 6 EO-2, Salyut 6 EO-6. More...
  • Romanenko Romanenko, Yuri Viktorovich (1944-) Russian pilot cosmonaut. Flew on Salyut 6 EO-1, Salyut 6 EP-8, Mir LD-1. Father of cosmonaut Roman Romanenko. 430 cumulative days in space. More...

Associated Countries
Associated Spacecraft
  • Soyuz 7K-T Russian manned spacecraft. 23 launches, 1972.06.26 (Cosmos 496) to 1981.05.14 (Soyuz 40). More...

See also
Associated Manufacturers and Agencies
  • MOM Russian agency overseeing development of spacecraft. Ministry of General Machine Building (Moskva, Russia), Moscow, Russia. More...

Associated Programs
  • Salyut 6 Mishin was authorised in December 1973 to build an improved design DOS-5 version of the Salyut station using Almaz facilities. Mishin's bureau borrowed the two docking port configuration of Chelomei's Almaz OPS-2 This station's second docking port would allow rotation of crews and resupply/refueling using unmanned Progress spacecraft. More...

  • Portree, David S. F., Mir Hardware Heritage, NASA Reference Publication 1357, March 1995.

Associated Launch Sites
  • Baikonur Russia's largest cosmodrome, the only one used for manned launches and with facilities for the larger Proton, N1, and Energia launch vehicles. The spaceport ended up on foreign soil after the break-up of Soviet Union. The official designations NIIP-5 and GIK-5 are used in official Soviet histories. It was also universally referred to as Tyuratam by both Soviet military staff and engineers, and the US intelligence agencies. Since the dissolution of the Soviet Union the Russian Federation has insisted on continued use of the old Soviet 'public' name of Baikonur. In its Kazakh (Kazak) version this is rendered Baykonur. More...

Soyuz 25 Chronology

1977 October 9 - . 02:40 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC1. LV Family: R-7. Launch Vehicle: Soyuz 11A511U.
  • Soyuz 25 - . Call Sign: Foton (Photon). Crew: Kovalyonok; Ryumin. Backup Crew: Ivanchenkov; Romanenko. Payload: Soyuz 7K-T s/n 42. Mass: 6,860 kg (15,120 lb). Nation: USSR. Related Persons: Kovalyonok; Ryumin; Ivanchenkov; Romanenko. Agency: MOM. Program: Salyut 6. Class: Manned. Type: Manned spacecraft. Flight: Soyuz 25. Spacecraft: Soyuz 7K-T. Duration: 2.03 days. Decay Date: 1977-10-11 . USAF Sat Cat: 10401 . COSPAR: 1977-099A. Apogee: 240 km (140 mi). Perigee: 194 km (120 mi). Inclination: 51.6000 deg. Period: 88.80 min. Summary: Manned two crew. Unsuccessful mission. Failed to dock with Salyut 6..

1977 October 11 - .
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