 | |
| Operator | Soviet space program |
|---|---|
| COSPAR ID | 1979-049A |
| SATCAT no. | 11387 |
| Mission duration | 73 days, 18 hours and 16 minutes |
| Orbits completed | ~1,200 |
| Spacecraft properties | |
| Spacecraft type | Soyuz 7K-T |
| Manufacturer | NPO Energia |
| Launch mass | 6,800 kg (15,000 lb) |
| Crew | |
| Crew size | 0 up 2 down |
| Landing | Vladimir Lyakhov Valery Ryumin |
| Start of mission | |
| Launch date | June 6, 1979, 18:12:41 UTC |
| Rocket | Soyuz-U |
| Launch site | Baikonur 31/6 |
| End of mission | |
| Landing date | August 19, 1979, 12:29:26 UTC |
| Landing site | 170 km (110 mi) SE of Dzhezkazgan |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 199 km (124 mi) |
| Apogee altitude | 271.5 km (168.7 mi) |
| Inclination | 51.62 degrees |
| Period | 88.91 minutes |
| Docking with Salyut 6 | |
| Docking port | Aft |
| Docking date | June 8, 1979, 20:02:06 UTC[1] |
| Undocking date | June 14, 1979[2] |
| Time docked | 6 days |
| Redocking with Salyut 6 | |
| Redocking port | Front |
| Redocking date | June 14, 1979 |
| Unredocking date | August 19, 1979, 12:29:26 UTC[1] |
| Time redocked | 66 days |
Soyuz 34 (Russian: Союз 34, Union 34) was a 1979 Soviet uncrewed space flight to the Salyut 6 space station. It was sent to supply the resident crew a reliable return vehicle after the previous flight, Soyuz 33, suffered an engine failure.
Mission control decided to re-design the engine used on Soyuz craft as a result of the Soyuz 33 failure, and to return the Soyuz 32 craft which transported Vladimir Lyakhov and Valery Ryumin to the space station to Earth uncrewed as it had the same suspect engine as Soyuz 33. Soyuz 34 successfully returned the crew to earth 73 days after launching.