EORSAT home
topic index
Program: EORSAT. Objective: ELINT. Type: Naval reconnaisance. Overview: Naval forces monitoring. Determines position of enemy naval forces through detection and triangulation of their electromagnetic emissions (radio, radar, etc).
Major Events:

  • 1974 December 24 - Cosmos 699.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring; exploded 4/17/75.

  • 1975 October 29 - Cosmos 777.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring; exploded 1/76.

  • 1977 August 24 - Cosmos 937.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1979 April 18 - Cosmos 1094.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1979 April 25 - Cosmos 1096.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1980 March 14 - Cosmos 1167.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1980 November 4 - Cosmos 1220.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1981 March 20 - Cosmos 1260.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1981 August 4 - Cosmos 1286.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1981 September 14 - Cosmos 1306.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring; replaced Cosmos 1260.

  • 1982 February 11 - Cosmos 1337.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1982 April 29 - Cosmos 1355.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1982 September 4 - Cosmos 1405.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1983 May 7 - Cosmos 1461.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1983 October 29 - Cosmos 1507.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1984 May 30 - Cosmos 1567.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1984 August 7 - Cosmos 1588.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1985 January 23 - Cosmos 1625.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1985 April 18 - Cosmos 1646.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean monitoring.

  • 1985 September 19 - Cosmos 1682.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1986 February 27 - Cosmos 1735.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1986 March 25 - Cosmos 1737.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1986 August 4 - Cosmos 1769.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1987 April 8 - Cosmos 1834.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1987 October 10 - Cosmos 1890.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1988 May 28 - Cosmos 1949.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1988 November 18 - Cosmos 1979.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1989 July 24 - Cosmos 2033.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1989 September 27 - Cosmos 2046.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1989 November 24 - Cosmos 2051.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1990 March 14 - Cosmos 2060.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1990 August 23 - Cosmos 2096.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1990 November 14 - Cosmos 2103.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1990 December 4 - Cosmos 2107.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1991 January 18 - Cosmos 2122.  Spacecraft: US-P. Mass: 3,000 kg (6,600 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Ocean surveillance.

  • 1993 March 30 - Cosmos 2238.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    First launch of new EORSAT, first of at 120 degree intervals on the same orbit with a 0 degree ascending node. Ocean surveillance.

  • 1993 April 28 - Cosmos 2244.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Second launch of new EORSAT, second of three stationed at 120 degree intervals on the same orbit with a 0 degree ascending node.

  • 1993 July 7 - Cosmos 2258.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Third launch of new EORSAT, final of three stationed at 120 degree intervals on the same orbit with a 0 degree ascending node. Ocean surveillance.

  • 1993 September 17 - Cosmos 2264.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    EORSAT, first of three to be stationed at 120 degree intervals on the same orbit with a 215 degree ascending node. However cutbacks in program resulted in the constellation not being completed. Ocean surveillance.

  • 1994 November 2 - Cosmos 2293.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Second launch of new EORSAT, second of three to be stationed at 120 degree intervals on the same orbit with a 215 degree ascending node. However cutbacks in program resulted in the constellation not being completed. Ocean surveillance.

  • 1995 June 8 - Cosmos 2313.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    EORSAT, first of three to be stationed at 120 degree intervals on the same orbit with a 143 degree ascending node. However cutbacks in program resulted in the constellation not being completed. Ocean surveillance.

  • 1995 December 20 - Cosmos 2326.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    EORSAT, placed in 215 degree ascending node orbital slot. Ocean surveillance; also performed astrophysics research.

  • 1996 December 11 - Cosmos 2335.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    EORSAT, second of three to be stationed at 120 degree intervals on the same orbit with a 143 degree ascending node. However cutbacks in program resulted in the constellation not being completed. Still in operation as of December 1997.

  • 1997 December 9 - Cosmos 2347.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    EORSAT, in the 217 degree ascending node slot. Still in operation as of December 1997.

  • 2001 December 21 - Cosmos 2383.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Signal Intelligence Satellite. Launch delayed December 19. The booster put the satellite into an initial orbit of 145 x 405 km x 65.0 deg. At apogee the satellite ignited its own propulsion system to increase velocity by about 70-80 m/s and circularize the orbit.

  • 2004 May 28 - Cosmos 2405.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

    Original reported name Cosmos 2407.

  • 2006 June 24 - Cosmos 2421.  Spacecraft: US-PU. Mass: 3,150 kg (6,940 lb). Launch Site: Baikonur. Launch Vehicle: Tsiklon.

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© Mark Wade, 1997 - 2008 except where otherwise noted.