Program: Eorsat

Called US-P in Russia, Electronic Ocean Reconnaissance Satellite

Russian program part of the Cosmos constellation. Those satellites are observation satellites designed to monitor activity of foreign navies.

The series started in 1974 and around 40 satellites had been launched in mid-1995. The system went operational in 1978.

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First generation

Cosmos 0699	Cosmos 0777	Cosmos 0838	Cosmos 0868	Cosmos 0937	Cosmos 1094
Cosmos 1096	Cosmos 1167	Cosmos 1220	Cosmos 1260	Cosmos 1286	Cosmos 1306
Cosmos 1337	Cosmos 1355	Cosmos 1405	Cosmos 1461	Cosmos 1507	Cosmos 1567
Cosmos 1588	Cosmos 1625	Cosmos 1646	Cosmos 1682	Cosmos 1735	Cosmos 1737
Cosmos 1769	Cosmos 1890	Cosmos 1949	Cosmos 1979	Cosmos 2033	Cosmos 2046
Cosmos 2051	Cosmos 2060	Cosmos 2096	Cosmos 2103	Cosmos 2107	Cosmos 2122 (decayed)
Cosmos 2238	Cosmos 2244	Cosmos 2258 (decayed)	Cosmos 2264	Cosmos 2293	Cosmos 2313
Cosmos 2326	Cosmos 2335	Cosmos 2347	Cosmos 2367	Cosmos 2383	Cosmos 2405
Cosmos 2421

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Second generation

Cosmos 1867 (800 km, 65°, Topaz)

Cosmos 1818

Technical data

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Specifications

Prime contractor	KB Arsenal
Platform	US-P
Mass at launch	3150 kg
Mass in orbit
Length
Width
Height
Perigee/Apogee	400 km
Inclination	65°
Period	92 min
Stabilization
DC power
Design lifetime	1.5 years

It uses a low thrust engine to maintain its orbit.

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