Soyuz 12
Soyuz 12 (Russian: Союз 12, Union 12) was a 1973 crewed test flight by the Soviet Union of the newly redesigned Soyuz 7K-T spacecraft that was intended to provide greater crew safety in the wake of the Soyuz 11 tragedy. The flight marked the return of the Soviets to crewed space operations after the 1971 accident. The crew capacity of the capsule had been decreased from three to two cosmonauts to allow for pressure suits to be worn during launch, re-entry and docking. It was the first time pressure suits were used for reentry since the Voskhod 2 flight.[3]
Mission type | Test flight |
---|---|
COSPAR ID | 1973-067A |
SATCAT no. | 6836 |
Mission duration | 1 day, 23 hours, 15 minutes, 32 seconds |
Orbits completed | 31 |
Spacecraft properties | |
Spacecraft type | Soyuz 7K-T |
Manufacturer | OKB-1 |
Launch mass | 6,720 kilograms (14,820 lb) |
Crew | |
Crew size | 2 |
Members | Vasili Lazarev Oleg Makarov |
Callsign | Урал (Ural - "Ural") |
Start of mission | |
Launch date | 27 September 1973, 12:18:16 UTC |
Rocket | Soyuz |
Launch site | Baikonur 1/5[1] |
End of mission | |
Landing date | 29 September 1973, 11:33:48 UTC |
Landing site | 47°42′N 69°00′E |
Orbital parameters | |
Reference system | Geocentric |
Regime | Low Earth |
Perigee altitude | 306 kilometres (190 mi) |
Apogee altitude | 348 kilometres (216 mi) |
Inclination | 51.0 degrees |
Period | 91.0 minutes |
Epoch | 28 September 1973[2] |
![]() Soyuz programme (Crewed missions) |
Cosmonauts Vasili Lazarev and Oleg Makarov spent two days in space testing the new craft.
Crew
Position | Cosmonaut | |
---|---|---|
Commander | Vasili Lazarev First spaceflight | |
Flight Engineer | Oleg Makarov First spaceflight |
Mission parameters
- Mass: 6,720 kg (14,820 lb)
- Perigee: 306 km (190 mi)
- Apogee: 348 km (216 mi)
- Inclination: 51.0°
- Period: 91.0 min
Mission highlights
As the first crewed test of the new version of the Soyuz ferry craft, Soyuz 12 was to have flown to a Salyut station.[3] But the failures of Salyut 2 and Cosmos 557 in the months previous meant there was no station for the craft to dock to. The service module had no solar panels, carrying batteries for power instead,[3] which limited the flight to about two days, enough time for a journey to and from a space station.
Cosmonauts Lazarev and Makarov wore pressure suits for launch and landing, and would have worn them for a station docking, all changes brought about by the Soyuz 11 tragedy. The bulk of the suits and their environmental control systems limited the crew size to two.[3]
After the successful 27 September 1973 launch, the craft was maneuvered to a 326 x 344 km orbit on the second day in space,[3] which later proved to be the standard orbit for the Salyut 4 space station. A multispectral camera in the orbital module was used in coordination with aircraft to photograph the Earth. It was reported that the intention of the camera was to survey crop and forest conditions[3] The cosmonauts also utilised the Molniya 1 satellite to communicate with ground stations when out of range.[3]
The crew landed safely on 29 September and the mission was called "flawless."[3]
A large object was jettisoned when the craft was preparing for retrofire. The object remained in orbit for 116 days, landing 400 km southwest of Karaganda.[3]
See also
References
- "Baikonur LC1". Encyclopedia Astronautica. Archived from the original on 15 April 2009. Retrieved 4 March 2009.
- McDowell, Jonathan. "SATCAT". Jonathan's Space Pages. Retrieved 23 March 2014.
- Newkirk, Dennis (1990). Almanac of Soviet Manned Space Flight. Houston, Texas: Gulf Publishing Company. ISBN 0-87201-848-2.