From Wikipedia, the free encyclopedia
  (Redirected from US-KS (satellite))
Jump to: navigation, search
For The part of the United States, see Kansas.
Manufacturer NPO Lavochkin
Country of origin  Soviet Union
Operator VKS
Applications Missile defence
Bus Upravlyaemy Sputnik
Launch mass 2,400 kilograms (5,300 lb)
Regime Geosynchronous
Status Retired
Launched 7
Operational 0
Retired 7
Failed None known
Lost 0
First launch Kosmos 775
8 October 1975
Last launch Kosmos 2345
14 August 1997
Related spacecraft
Derived from US-K
Derivatives US-KMO

Upravlyaemy Sputnik Kontinentalny Statsionarny (Russian: Управляемый Спутник Континентальный Стационарный meaning Stationary Continental Controllable Satellite), or US-KS (Russian: УС-КС), also known as Oko-S (Russian: Око-С meaning Eye-S), was a series of Soviet, and later Russian, missile detection satellites launched as part of the Oko programme.[1] US-KS was a derivative of the US-K satellite, optimised for operations in geosynchronous orbit. Seven were launched between 1975 and 1997, when launches ended in favour of the modernised US-KMO.[2] US-KS had the GRAU index 74Kh6.

Manufactured by NPO Lavochkin, US-KS satellites had a launch mass of 2,400 kilograms (5,300 lb), and a dry mass of 1,250 kilograms (2,760 lb). Built on a three-axis stabilised cylindrical bus with a diameter of 1.7 metres (5 ft 7 in) and a length of 2 metres (6 ft 7 in), the satellites carry 50 centimetres (20 in) infrared telescopes to detect the heat of missile exhausts.[3]

US-KS satellites were launched by Proton-K carrier rockets, with Blok DM and DM-2 upper stages. The first satellite to be launched was a prototype, which was followed by six operational spacecraft. With a spacecraft positioned at a longitude of 24° West, the Soviet Union could continuously monitor missile launches from the United States.[3]


  1. ^ Zak, Anatoly. "Oko early-warning satellite". RussianSpaceWeb. Retrieved 6 March 2012. 
  2. ^ Krebs, Gunter. "US-KMO (71Kh6)". Gunter's Space Page. Retrieved 6 March 2012. 
  3. ^ a b Krebs, Gunter. "US-KS (74Kh6)". Gunter's Space Page. Retrieved 6 March 2012.