Soyuz 34

Soyuz 34
OperatorSoviet space program
COSPAR ID1979-049A Edit this at Wikidata
SATCAT no.11387
Mission duration73 days, 18 hours and 16 minutes
Orbits completed~1,200
Spacecraft properties
Spacecraft typeSoyuz 7K-T
ManufacturerNPO Energia
Launch mass6,800 kg (15,000 lb)
Crew
Crew size0 up
2 down
LandingVladimir Lyakhov
Valery Ryumin
Start of mission
Launch dateJune 6, 1979, 18:12:41 (1979-06-06UTC18:12:41Z) UTC
RocketSoyuz-U
Launch siteBaikonur 31/6
End of mission
Landing dateAugust 19, 1979, 12:29:26 (1979-08-19UTC12:29:27Z) UTC
Landing site170 km (110 mi) SE of Dzhezkazgan
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude199 km (124 mi)
Apogee altitude271.5 km (168.7 mi)
Inclination51.62 degrees
Period88.91 minutes
Docking with Salyut 6
Docking portAft
Docking dateJune 8, 1979, 20:02:06 UTC[1]
Undocking dateJune 14, 1979[2]
Time docked6 days
Redocking with Salyut 6
Redocking portFront
Redocking dateJune 14, 1979
Unredocking dateAugust 19, 1979, 12:29:26 UTC[1]
Time redocked66 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.

  1. ^ a b Cite error: The named reference spacefacts2 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference spacefacts1 was invoked but never defined (see the help page).