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, was a series of
Soviet, and later Russian, missile detection satellites launched as part of the
Oko
OKO ( rus, ОКО, r=, literally means eye, also an abbreviation for Ob'yedinonnyye Kristallom Osnovaniya ( rus, Oбъединённые Кристаллом Oснования, r=, literally means Foundations Bound by a Crystal)) is a complex o ...
(russian: "eye") programme.
US-KS was a derivative of the
US-K
Upravlyaemy Sputnik Kontinentalny (russian: Управляемый Спутник Континентальный meaning ''Continental Controllable Satellite'') or US-K (russian: УС-К) is a series of Russian, previously Soviet, satellites used t ...
satellite, optimised for operations in
geosynchronous orbit. Seven were launched between 1975 and 1997, when launches ended in favour of the modernised
US-KMO
US-KMO (russian: УС-КМО), an abbreviation for Upravlyaemy Sputnik - Kontinenty Morya Okeany (russian: Управляемый Спутник - Континенты Моря Океаны) meaning ''Controllable Satellite - Continents, Oceans, Se ...
.
US-KS had the
GRAU index ''74Kh6''. As of December 2015, the entire Oko programme is being replaced by the new
EKS system.
Manufactured by
NPO Lavochkin
NPO Lavochkin (russian: НПО Лавочкина, OKB-301, also called Lavochkin Research and Production Association or shortly Lavochkin Association, LA) is a Russian aerospace company. It is a major player in the Russian space program, being th ...
, US-KS satellites had a launch mass of , and a dry mass of . Built on a three-axis stabilised cylindrical bus with a diameter of and a length of , the satellites carry infrared telescopes to detect the heat of missile exhausts.
US-KS satellites were launched by
Proton-K
The Proton-K, also designated Proton 8K82K after its GRAU index or SL-12 after its model number, 8K82K, was a Russian, previously Soviet, carrier rocket derived from the earlier Proton. It was built by Khrunichev, and launched from sites 81 an ...
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.
References
Oko
Military satellites
Military satellites of Russia
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