Kosmos 665

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Kosmos 665
Mission type Early warning
COSPAR ID 1974-050A
SATCAT no. 7352
Mission duration 4 years [1]
Spacecraft properties
Spacecraft type US-K [2]
Launch mass 1,900 kilograms (4,200 lb)
Start of mission
Launch date 29 June 1974, 15:59 (1974-06-29UTC15:59Z) UTC
Rocket Molniya-M/2BL[2]
Launch site Plesetsk Cosmodrome[2][3]
End of mission
Deactivated 7 September 1975[1]
Decay date 6 July 1990 (1990-07-07)[4]
Orbital parameters
Reference system Geocentric
Regime Molniya [2]
Perigee 659 kilometres (409 mi)[4]
Apogee 39,689 kilometres (24,662 mi)[4]
Inclination 62.7 degrees[4]
Period 717.66 minutes[4]

Kosmos 665 (Russian: Космос 665 meaning Cosmos 665) was a Soviet US-K missile early warning satellite which was launched in 1974 as part of the Soviet military's Oko programme. The satellite was designed to identify missile launches using optical telescopes and infrared sensors.[2]

Kosmos 665 was launched from Site 41/1 at Plesetsk Cosmodrome in the Russian SSR.[3] A Molniya-M carrier rocket with a 2BL upper stage was used to perform the launch, which took place at 15:59 UTC on 29 June 1974.[3] The launch successfully placed the satellite into a molniya orbit. It subsequently received its Kosmos designation, and the international designator 1974-050A.[4] The United States Space Command assigned it the Satellite Catalog Number 7352.[4]

It re-entered the Earth's atmosphere on 6 July 1990.[4]


  1. ^ a b Podvig, Pavel (2002). "History and the Current Status of the Russian Early-Warning System" (pdf). Science and Global Security. 10: 21–60. doi:10.1080/08929880212328. ISSN 0892-9882. 
  2. ^ a b c d e "US-K (73D6)". Gunter's Space Page. 2012-03-08. Retrieved 2012-04-21. 
  3. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 2 May 2012. 
  4. ^ a b c d e f g h McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 30 April 2012. 

See also[edit]