Kosmos 27

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Kosmos 27
Mission type Venus flyby / lander
Operator OKB-1
COSPAR ID 1964-014A[1]
SATCAT no. 772
Spacecraft properties
Spacecraft type 3MV-1
Manufacturer OKB-1
Launch mass 890 kg (1,960 lb)
Start of mission
Launch date 27 March 1964, 03:24 (1964-03-27UTC03:24Z) UTC
Rocket Molniya 8K78M/T-15000-22
Launch site Baikonur 1/5
Orbital parameters
Reference system Geocentric
Regime Low Earth
Eccentricity 0.002631
Perigee 197 kilometers (122 mi)
Apogee 209 kilometers (130 mi)
Inclination 64.8°
Period 88.5 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. Encyclopedia Astronautica. Retrieved 17 February 2017.