Kosmos 850 (Russian: Космос 850 meaning Cosmos 850), also known as DS-P1-Yu No.79, was a Soviet satellite which was launched in 1976 as part of the Dnepropetrovsk Sputnik programme. It was a 400-kilogram (880 lb) spacecraft, which was built by the Yuzhnoye Design Bureau, and was used as a radar calibration target for anti-ballistic missile tests.
A Kosmos-2I 63SM carrier rocket was used to launch Kosmos 850 from Site 133/1 of the Plesetsk Cosmodrome. The launch occurred at 11:00 UTC on 26 August 1976, and resulted in the successfully insertion of the satellite into low Earth orbit. Upon reaching orbit, the satellite was assigned its Kosmos designation, and received the International Designator 1976-084A. The North American Aerospace Defense Command assigned it the catalogue number 09387.
Kosmos 850 was the last of seventy nine DS-P1-Yu satellites to be launched, of which seventy two successfully achieved orbit. It was operated in an orbit with a perigee of 267 kilometres (166 mi), an apogee of 479 kilometres (298 mi), 70.9 degrees of inclination, and an orbital period of 92 minutes. It remained in orbit until it decayed and reentered the atmosphere on 16 May 1977.
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