Kosmos 27

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Kosmos 27
Mission typeVenus flyby / lander
COSPAR ID1964-014A[1]
SATCAT no.772
Spacecraft properties
Spacecraft type3MV-1
Launch mass890 kg (1,960 lb)
Start of mission
Launch date27 March 1964, 03:24 (1964-03-27UTC03:24Z) UTC
RocketMolniya 8K78M/T-15000-22
Launch siteBaikonur 1/5
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude197 kilometers (122 mi)
Apogee altitude209 kilometers (130 mi)
Period88.5 minutes

Kosmos 27 (Russian: Космос 27 meaning Cosmos 27), also known as Zond 3MV-1 No.3 was a space mission intended as a Venus flyby. The spacecraft was launched by a Molniya-M carrier rocket from LC-1 at Baikonur on March 27, 1964; the Blok L stage and probe reached Earth orbit successfully, but the attitude control system failed to operate and so the stage could not be oriented properly for main engine start. It reentered the atmosphere one day after launch and burned up. Examination of telemetry data found that the failure was due to a design flaw in the circuitry of the BOZ unit, which resulted in power not being transferred to the attitude control jets on the Blok L stage.[2]

See also[edit]


  1. ^ NASA Goddard Space Flight Center Kosmos 27. NSSDC Master Catalog. Retrieved 17 February 2017.
  2. ^ Wade, Mark Venera 3MV-1 Archived 2002-02-27 at the Wayback Machine. Encyclopedia Astronautica. Retrieved 17 February 2017.