Venera 2MV-1 No.2

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2MV-1 No.2
Venera 1962 diagramm.jpg
Diagramm of the Sputnik 20
Mission type Venus lander
Operator OKB-1
Harvard designation 1962 Alpha Tau 1
COSPAR ID 1962-043A
SATCAT no. 381
Mission duration Launch failure
Spacecraft properties
Spacecraft type 2MV-1
Manufacturer OKB-1
Launch mass 6,500 kg (14,300 lb)
Start of mission
Launch date 1 September 1962, 02:12:30 (1962-09-01UTC02:12:30Z) UTC
Rocket Molniya 8K78 s/n T103-13
Launch site Baikonur 1/5
End of mission
Decay date 6 September 1962 (1962-09-07)
Orbital parameters
Reference system Geocentric
Regime Low Earth (achieved)
Heliocentric (intended)
Eccentricity 0.00981
Perigee 180 kilometres (110 mi)
Apogee 310 kilometres (190 mi)
Inclination 64.9 degrees
Period 89.4 minutes
Epoch 1 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]


  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.