Venera 2MV-1 No.2

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2MV-1 No.2
Venera 1962 diagramm.jpg
Diagramm of the Sputnik 20
Mission typeVenus lander
OperatorOKB-1
Harvard designation1962 Alpha Tau 1
COSPAR ID1962-043A
SATCAT no.381
Mission durationLaunch failure
Spacecraft properties
Spacecraft type2MV-1
ManufacturerOKB-1
Launch mass6,500 kg (14,300 lb)
Start of mission
Launch date1 September 1962, 02:12:30 (1962-09-01UTC02:12:30Z) UTC
RocketMolniya 8K78 s/n T103-13
Launch siteBaikonur 1/5
End of mission
Decay date6 September 1962 (1962-09-07)
Orbital parameters
Reference systemGeocentric
RegimeLow Earth (achieved)
Heliocentric (intended)
Eccentricity0.00981
Perigee180 kilometres (110 mi)
Apogee310 kilometres (190 mi)
Inclination64.9 degrees
Period89.4 minutes
Epoch1 September 1962 (1962-09)
 

Venera 2MV-1 No.2,[1][2] also known as Sputnik 20 in the Western world, was a Soviet spacecraft, which was launched in 1962 as part of the Venera programme, and was intended to become the first spacecraft to land on Venus.[3] Due to a problem with its upper stage it failed to leave low Earth orbit, and reentered the atmosphere a few days later.[4] It was the second of two Venera 2MV-1 spacecraft, both of which failed to leave Earth orbit. The previous mission, Venera 2MV-1 No.1, was launched several days earlier.[2]

Venera 2MV-1 No.2 was launched at 02:12:30 UTC on 1 September 1962, atop a Molniya 8K78 carrier rocket flying from Site 1/5 at the Baikonur Cosmodrome.[1] The lower stages of the rocket operated nominally, injecting the fourth stage and payload into a low Earth orbit. Following a coast phase, the upper stage was to have ignited around sixty-one minutes and thirty seconds after launch, in order to place the spacecraft into heliocentric orbit. The ignition command did not reach the engine however, and the fuel valves did not open, so the upper stage failed to ignite leaving the payload in geocentric orbit.[5] It reentered the atmosphere on 6 September 1962, five days after it had been launched.[6]

The designations Sputnik 24, and later Sputnik 20 were used by the United States Naval Space Command to identify the spacecraft in its Satellite Situation Summary documents, since the Soviet Union did not release the internal designations of its spacecraft at that time, and had not assigned it an official name due to its failure to depart Earth orbit.[3][7] [8]

See also[edit]

References[edit]

  1. ^ a b McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 28 July 2010.
  2. ^ a b Krebs, Gunter. "Venera (2a), (2b) (2MV-1 #1, 2)". Gunter's Space Page. Retrieved 28 July 2010.
  3. ^ a b Zak, Anatoly. "Russia's unmanned missions to Venus". RussianSpaecWeb. Retrieved 28 July 2010.
  4. ^ Wade, Mark. "Venera". Encyclopedia Astronautica. Archived from the original on 17 February 2012. Retrieved 28 July 2010.
  5. ^ Wade, Mark. "Soyuz". Encyclopedia Astronautica. Archived from the original on 17 January 2010. Retrieved 28 July 2010.
  6. ^ McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 28 July 2010.
  7. ^ Robbins, Stuart J. (11 January 2006). "Soviet Craft - Sputnik". Journey Through The Galaxy. Archived from the original on 4 February 2009. Retrieved 28 July 2010.
  8. ^ "Sputnik 20". NASA NSSDC. Retrieved 28 July 2010.