# Prognoz programme

Prognoz, also known as SO (Solar Object, first three satellites), SO-M (SO-modified, next seven satellites), and SO-M2 (last two satellites, also known as Interball), was a Soviet scientific research satellite programme. Twelve Prognoz satellites were launched between 14 April 1972, and 29 August 1996, by Molniya-M carrier rockets. The satellites were placed in high Earth orbits. The first ten Prognoz satellites were launched from Site 31/6 at the Baikonur Cosmodrome, and the last two from Site 43/3 at the Plesetsk Cosmodrome.
The satellites were primarily used for Solar research; however, the later satellites were used for other kinds of research, including research into the Big Bang theory, and Earth's magnetosphere. The tenth satellite was used as part of the Interkosmos programme.

## Satellites

| Designation | Launch date/time (GMT) | Mass | Apogee initial | Perigee initial | Inclination initial | Mission | Remarks |
| Prognoz 1 | 14 April 1972, 00:54 | 845 kilograms (1,863 lb) | 199,667 kilometres (124,067 mi) | 1,005 kilometres (624 mi) | 65° | Study Solar activity | |
| Prognoz 2 | 29 June 1972, 03:47 | 845 kilograms (1,863 lb) | 201,804 kilometres (125,395 mi) | 517 kilometres (321 mi) | 65.3° | Study Solar activity | |
| Prognoz 3 | 15 February 1973, 01:11 | 845 kilograms (1,863 lb) | 200,000 kilometres (120,000 mi) | 590 kilometres (370 mi) | 65° | Study Solar activity | |
| Prognoz 4 | 22 December 1975, 02:08 | 905 kilograms (1,995 lb) | 199,000 kilometres (124,000 mi) | 634 kilometres (394 mi) | 65° | Study Solar radiation and Plasma, and Earth's magnetosphere | |
| Prognoz 5 | 25 November 1976, 03:59 | 930 kilograms (2,050 lb) | 198,560 kilometres (123,380 mi) | 777 kilometres (483 mi) | 65.2° | Study Solar radiation and Plasma, and Earth's magnetosphere | |
| Prognoz 6 | 22 September 1977, 00:51 | 910 kilograms (2,010 lb) | 197,867 kilometres (122,949 mi) | 488 kilometres (303 mi) | 65° | Study Solar radiation and Plasma, and Earth's magnetosphere | |
| Prognoz 7 | 30 October 1978, 05:23 | 950 kilograms (2,090 lb) | 202,627 kilometres (125,907 mi) | 472 kilometres (293 mi) | 64.9° | Study Solar radiation and Plasma, and Earth's magnetosphere UV, X-ray and Gamma ray astronomy | Carried Czechoslovakian, French, Hungarian and Swedish experiments |
| Prognoz 8 | 25 December 1980, 04:02 | 910 kilograms (2,010 lb) | 197,364 kilometres (122,636 mi) | 978 kilometres (608 mi) | 65.8° | Study Solar radiation and Plasma, and Earth's magnetosphere | Carried Czechoslovakian, Polish and Swedish experiments |
| Prognoz 9 | 1 July 1983, 12:17 | 1,060 kilograms (2,340 lb) | 700,000 kilometres (430,000 mi) | 480 kilometres (300 mi) | 65° | Study Solar and cosmic radiation, Solar Plasma, Earth's magnetosphere and Gamma rays | Carried Czechoslovakian and French experiments |
| Prognoz 10 (Intershock) | 26 April 1985, 05:48 | 1,000 kilograms (2,200 lb) | 194,734 kilometres (121,002 mi) | 5,975 kilometres (3,713 mi) | 65° | Study Solar wind and Earth's magnetosphere | Intercosmos 23. Carried Czechoslovakian experiments |
| Prognoz 11 (Interball Tail Probe) | 2 August 1995 | | 193,064 kilometres (119,964 mi) | 505 kilometres (314 mi) | 63.8° | Study Solar wind and Earth's magnetosphere | |
| Prognoz 12 (Interball Auroral Probe) | 29 August 1996 | | 19,140 kilometres (11,890 mi) | 782 kilometres (486 mi) | 62.8° | Study aurora | |