Venera 2MV-1 No.2

From Wikipedia, the free encyclopedia
Jump to: navigation, search
2MV-1 No.2
Mission type Venus lander
Harvard designation 1962 Alpha Tau 1
Mission duration Launch failure
Spacecraft properties
Spacecraft type 2MV-1
Manufacturer OKB-1
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)
Perigee 185 kilometres (115 mi)
Apogee 246 kilometres (153 mi)
Inclination 64.8 degrees
Period 88.8 minutes

Venera 2MV-1 No.2,[1][2] also known as Sputnik 20 in the West, 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]


  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. Retrieved 28 July 2010. 
  5. ^ Wade, Mark. "Soyuz". Encyclopedia Astronautica. 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. Retrieved 28 July 2010. 
  8. ^ "Sputnik 20". NASA NSSDC. Retrieved 28 July 2010.