|Salyut 7 photographed following the undocking of Soyuz T-13, 25 September 1985|
|Launch||19 April 1984
|Launch pad||LC-200/40, Baikonur Cosmodrome, Soviet Union|
|Reentry||7 February 1991|
|Length||16 m (minimum)|
|Width||4.15 m (max.|
|Pressurised volume||90 m³ (minimum)|
|Perigee||219 km (118.25 nmi)|
|Apogee||278 km (150.1 nmi)|
|Orbital inclination||51.6 degrees|
|Orbital period||89.2 minutes|
|Days in orbit||3216 days|
|Days occupied||816 days|
|Number of orbits||51,917|
|Distance travelled||2,106,297,129 km
|Statistics as of de-orbit and reentry|
|Salyut 7 with docked Kosmos 1686 TKS spacecraft|
Salyut 7 (Russian: Салют-7; English: Salute 7) (aka DOS-6) was a space station in low Earth orbit from April 1982 to February 1991. It was first manned in May 1982 with two crew via Soyuz T-5, and last visited in June 1986, by Soyuz T-15. Various crew and modules were used over its lifetime, including a total of 12 manned and 15 unmanned launches. Supporting spacecraft included the Soyuz T, Progress, and TKS spacecraft.
It was part of the Soviet Salyut programme, and launched on 19 April 1982 on a Proton rocket from Site 200/40 at the Baikonur Cosmodrome in what was then the Soviet Union. Salyut 7 was part of the transition from "monolithic" to "modular" space stations, acting as a testbed for docking of additional modules and expanded station operations. It was also the tenth space station of any kind launched.
Salyut 7 was the back-up vehicle for Salyut 6 and very similar in equipment and capabilities. With delays to the Mir programme it was decided to launch the back-up vehicle as Salyut 7. In orbit the station suffered a number of technical failures though it benefited from the improved payload capacity of the visiting Progress and Soyuz craft and the experience of its crews who improvised many solutions (such as a fuel line rupture in September 1983 requiring EVAs by the Soyuz T-10 to repair). It was aloft for eight years and ten months (a record not broken until Mir), during which time it was visited by 10 crews constituting six main expeditions and four secondary flights (including French and Indian cosmonauts). The station also saw two flights of Svetlana Savitskaya making her the second woman in space since 1963 and the first to perform an EVA. Aside from the many experiments and observations made on Salyut 7, the station also tested the docking and use of large modules with an orbiting space station. The modules were called "Heavy Kosmos modules" though in reality were variants of the TKS spacecraft intended for the cancelled Almaz military space station. They helped engineers develop technology necessary to build Mir.
It had two docking ports, one on either end of the station, to allow docking with the Progress unmanned resupply craft, and a wider front docking port to allow safer docking with a Heavy Kosmos module. It carried three solar panels, two in lateral and one in dorsal longitudinal positions, but they now had the ability to mount secondary panels on their sides. Internally, the Salyut 7 carried electric stoves, a refrigerator, constant hot water and redesigned seats at the command console (more like bicycle seats). Two portholes were designed to allow ultraviolet light in, to help kill infections. Further, the medical, biological and exercise sections were improved, to allow long stays in the station. The BST-1M telescope used in Salyut 6 was replaced by an X-ray detection system.
Salyut 7 deorbited on 7 February 1991.
Crews and missions 
Following up the use of Kosmos 1267 on Salyut 6, the Soviets launched Kosmos 1443 on 2 March 1983, from a Proton SL-13. It docked with the station on 10 March, and was used by the crew of Soyuz T-9. It jettisoned its recovery module on 23 August, and re-entered the atmosphere on 19 September. Kosmos 1686 was launched on 27 September 1985, docking with the station on 2 October. It did not carry a recovery vehicle, and remained connected to the station for use by the crew of Soyuz T-14. Ten Soyuz T crews operated in Salyut 7. Only two Interkosmos "guest cosmonauts" worked in Salyut 7. The first attempt to launch Soyuz T-10 was aborted on the launch pad when a fire broke out at the base of the vehicle. The payload was ejected, and the crew was recovered safely.
Salyut 7 had six resident crews.
- The first crew, Anatoli Berezovoy and Valentin Lebedev, arrived on 13 May 1982 on Soyuz T-5 and remained for 211 days until 10 December 1982.
- On 27 June 1983, the crew of Vladimir Lyakhov and Alexander Alexandrov arrived on Soyuz T-9 and remained for 150 days, until 23 November 1983.
- On 8 February 1984, Leonid Kizim, Vladimir Solovyov and Oleg Atkov began a 237 day stay, the longest on Salyut 7, which ended on 2 October 1984.
- Vladimir Dzhanibekov and Viktor Savinykh (Soyuz T-13) arrived at the space station on 6 June 1985.
- On 17 September 1985, Soyuz T-14 docked with the station carrying Vladimir Vasyutin, Alexander Volkov and Georgi Grechko. Eight days later Dzhanibekov and Grechko left the station and returned to Earth after 103 days, while Savinyikh, Vasyutin and Volkov remained on Salyut 7 and returned to Earth on 21 November 1985 after 65 days.
- On 6 May 1986, Soyuz T-15 carrying Leonid Kizim and Vladimir Solovyov docked with the space station. The Soyuz had come from the Mir space station and returned to Mir after 50 days on Salyut.
There were also four visiting missions, crews which came to bring supplies and make shorter duration visits with the resident crews.
Technical problems 
The station suffered from two major problems, the first of which required extensive repair work to be performed on a number of EVAs.
On 9 September 1983, during the stay of Vladimir Lyakhov and Alexander Alexandrov, while reorienting the station to perform a radiowave transmission experiment, Lyakhov noticed the pressure of one fuel tank was almost zero. Following this, Alexandrov spotted a fuel leak looking through the aft porthole. Ground control decided to try to repair the damaged pipes, in what was to be the most complex repair attempted during EVA at the time. However this was to be attempted by the next crew, the current one lacking the necessary training and tools. The damage was eventually repaired by Leonid Kizim and Vladimir Solovyov, who after four EVAs managed to fix two leaks but needed a special tool to fix the third. The tool was delivered by Soyuz T-12, and the leak was subsequently fixed.
Loss of power 
On 11 February 1985, contact with Salyut 7 was lost. The station began to drift, and all systems shut down. At this time the station was uninhabited, after the departure of Leonid Kizim, Vladimir Solovyov and Oleg Atkov, and before the next crew arrived. It was once again decided to attempt to repair the station, which was performed by Vladimir Dzhanibekov and Viktor Savinykh on the Soyuz T-13 mission, in what was in the words of author David S. F. Portree "one of the most impressive feats of in-space repairs in history".
All Soviet and Russian space stations were equipped with automatic rendezvous and docking systems, from the first space station Salyut 1 using the IGLA system, to the Russian Orbital Segment of the International Space Station using the Kurs system. Upon arrival, 6 June, the Soyuz crew found the station was not broadcasting radar or telemetry for rendezvous, and after arrival and external inspection of the tumbling station, the crew judged proximity using handheld laser rangefinders.
Dzhanibekov piloted his ship to intercept the forward port of Salyut 7 and matched the station's rotation. After hard docking to the station and confirming the station's electrical system was dead, Dzhanibekov and Savinykh sampled the station atmosphere prior to opening the hatch. Attired in winter fur-lined clothing, they entered the station to conduct repairs. The fault was eventually found to be an electrical sensor that determined when the batteries need charging.
Once the batteries were replaced, the station started charging them, and warmed up over the next few days. Within a week sufficient systems were brought back online to allow robot cargo ships to dock with the station.
End of life 
Salyut 7 was last inhabited in 1986 by the crew of Soyuz T-15, who ferried equipment from Salyut 7 to the new Mir space station. Between 19 and 22 August 1986, engines on Kosmos 1686 boosted Salyut 7 to a record-high mean orbital altitude of 475 km to forestall reentry.
|Expedition||Crew||Launch date||Flight up||Landing date||Flight down||Duration (days)|
|Salyut 7 – EO-1||Anatoli Berezovoy,
|13 May 1982
|Soyuz T-5||10 December 1982
|Salyut 7 – EP-1||Vladimir Dzhanibekov,
Jean-Loup Chrétien – France
|24 June 1982
|Soyuz T-6||2 July 1982
|Salyut 7 – EP-2||Leonid Popov,
|19 August 1982
|Soyuz T-7||27 August 1982
|Salyut 7 – EO-2||Vladimir Lyakhov,
Aleksandr Pavlovich Aleksandrov
|27 June 1983
|Soyuz T-9||23 November 1983
|Salyut 7 – EO-3||Leonid Kizim,
|8 February 1984
|Soyuz T-10||2 October 1984
|Salyut 7 – EP-3||Yuri Malyshev,
Rakesh Sharma – India
|3 April 1984
|Soyuz T-11||11 April 1984
|Salyut 7 – EP-4||Vladimir Dzhanibekov,
|17 July 1984
|Soyuz T-12||29 July 1984
|Salyut 7 – EO-4-1a||Viktor Savinykh||6 June 1985
|Soyuz T-13||21 November 1985
|Salyut 7 – EO-4-1b||Vladimir Dzhanibekov||6 June 1985
|Soyuz T-13||26 September 1985
|Salyut 7 – EP-5||Georgi Grechko||17 September 1985
|Soyuz T-14||26 September 1985
|Salyut 7 – EO-4-2||Vladimir Vasyutin,
|17 September 1985
|Soyuz T-14||21 November 1985
|Salyut 7 – EO-5||Leonid Kizim,
|13 March 1986
|Soyuz T-15||16 July 1986
50 on S7
|Spacecraft||Spacewalker||Start – UTC||End – UTC||Duration||Comments|
|Salyut 7 – PE-1 – EVA 1||Lebedev, Berezevoi||30 July 1982
|30 July 1982
|2 h, 33 min||Retrieve experiments|
|Salyut 7 – PE-2 – EVA 1||Lyakhov, Alexandrov||1 November 1983
|1 November 1983
|2 h, 50 min||Add solar array|
|Salyut 7 – PE-2 – EVA 2||Lyakhov, Alexandrov||3 November 1983
|3 November 1983
|2 h, 55 min||Add solar array|
|Salyut 7 – PE-3 – EVA 1||Kizim, Solovyov||23 April 1984
|23 April 1984
|4 h, 20 min||ODU repair|
|Salyut 7 – PE-3 – EVA 2||Kizim, Solovyov||26 April 1984
|26 April 1984
|4 h, 56 min||Repair ODU|
|Salyut 7 – PE-3 – EVA 3||Kizim, Solovyov||29 April 1984
|29 April 1984
|2 h, 45 min||Repair ODU|
|Salyut 7 – PE-3 – EVA 4||Kizim, Solovyov||3 May 1984
|4 May 1984
|2 h, 45 min||Repair ODU|
|Salyut 7 – PE-3 – EVA 5||Kizim, Solovyov||18 May 1984
|18 May 1984
|3 h, 05 min||Add solar array|
|Salyut 7 – VE-4 – EVA 1||Savitskaya, Dzhanibekov||25 July 1984
|25 July 1984
|3 h, 35 min||First woman EVA|
|Salyut 7 – PE-3 – EVA 6||Kizim, Solovyov||8 August 1984
|8 August 1984
|5 h, 00 min||Complete ODU repair|
|Salyut 7 – PE-4 – EVA 1||Dzhanibekov, Savinykh||2 August 1985
|2 August 1985
|5 h, 00 min||Augment solar arrays|
|Salyut 7 – PE-6 – EVA 1||Kizim, Solovyov||28 May 1986
|28 May 1986
|3 h, 50 min||Test truss, retrieve samples|
|Salyut 7 – PE-6 – EVA 2||Kizim, Solovyov||31 May 1986
|31 May 1986
|5 h, 00 min||Test truss|
Specifications of the baseline 1982 Salyut 7 module, from Mir Hardware Heritage (1995, NASA RP1357):
- Length – about 16 m
- Maximum diameter – 4.15 meters
- Habitable volume – 90 m³
- Weight at launch – 19,824 kg
- Launch vehicle – Proton rocket (three-stage)
- Orbital inclination – 51.6°
- Span across solar arrays – 17 m
- Area of solar arrays – 51 m²
- Number of solar arrays – 3
- Electricity available – 4.5 kW
- Resupply carriers – Soyuz-T, Progress, TKS spacecraft
- Docking System – Igla or manual approach
- Number of docking ports – 2
- Total manned missions – 12
- Total unmanned missions – 15
- Total long-duration missions – 6
- Number of main engines – 2
- Main engine thrust (each) – 300 kg
Visiting spacecraft and crews 
(Launched crews. Spacecraft launch and landing dates listed.)
- Soyuz T-6 – 24 June – 2 July 1982 – Intercosmos Flight
- TKS 2 – 4 March – 14 August 1983 – Launched unmanned as Kosmos 1443.
- Soyuz T-11 – 3 April – 2 October 1984 – Intercosmos Flight
- TKS 3 – September 1985 – 7 February 1991 – Launched unmanned as Kosmos 1686. Featured a high-resolution photo apparatus and optical sensor experiments (infrared telescope and Ozon spectrometer).
See also 
- David Portree - Mir Hardware Heritage (1995) - Page 90-95 - NASA RP1357
- Leaving Earth, by Robert Zimmerman, ISBN 0-309-08548-9, 2003.
- aero.org, Spacecraft Reentry FAQ:
- Astronautix, Salyut 7.
- NYT, Salyut 7, Soviet Station in Space, Falls to Earth After 9-Year Orbit
- Soviet Space Stations as Analogs - NASA report (PDF format)