Kosmos 35


Kosmos 35 (Russian: Космос 35 meaning Cosmos 35) or Zenit-2 No.21 was a Soviet, first generation, low resolution, optical film-return reconnaissance satellite launched in 1964. A Zenit-2 spacecraft, Kosmos 35 was the twentieth of eighty-one such satellites to be launched[3] and had a mass of 4,730 kilograms (10,430 lb).

Kosmos 35
Mission typeOptical imaging reconnaissance
COSPAR ID1964-039A Edit this at Wikidata
SATCAT no.00833
Mission duration8 days
Spacecraft properties
Spacecraft typeZenit-2
Launch mass4730 kg[1]
Start of mission
Launch date15 July 1964, 11:31:00 GMT
RocketVostok-2 s/n R15001-03
Launch siteBaikonur, Site 31/6
End of mission
Landing date23 July 1964
Orbital parameters
Reference systemGeocentric[2]
RegimeLow Earth
Perigee altitude218 km
Apogee altitude258 km
Period89.2 minutes
Epoch15 July 1964

Kosmos 35 was launched by a Vostok-2 rocket, serial number R15001-03,[4] flying from Site 31/6 at the Baikonur Cosmodrome. The launch took place at 11:31 GMT on 15 July 1964,[5] and following its successful arrival in orbit the spacecraft received its Kosmos designation; along with the International Designator 1964-039A and the Satellite Catalog Number 00833.[6]

Kosmos 35 was operated in a low Earth orbit, it had a perigee of 218 kilometres (135 mi), an apogee of 258 kilometres (160 mi), inclination of 51.3° and an orbital period of 89.2 minutes. On 23 July 1964, after eight days in orbit, the satellite was deorbited with its return capsule descending by parachute for recovery by Soviet forces.[7][8]


  1. ^ https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1964-039A - 27 February 2020
  2. ^ https://nssdc.gsfc.nasa.gov/nmc/spacecraft/displayTrajectory.action?id=1964-039A - 27 February 2020
  3. ^ Krebs, Gunter. "Zenit-2 (11F61)". Gunter's Space Page. Archived from the original on 31 December 2011. Retrieved 17 December 2013.
  4. ^ Wade, Mark. "Vostok 8A92". Encyclopedia Astronautica. Archived from the original on 22 August 2016. Retrieved 13 December 2013.
  5. ^ McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 17 December 2013.
  6. ^ "Cosmos 35". National Space Science Data Center. Retrieved 17 December 2013.
  7. ^ McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 17 December 2013.
  8. ^ Wade, Mark. "Zenit-2". Encyclopedia Astronautica. Archived from the original on 23 May 2012. Retrieved 17 December 2013.