Table 2: Dates of launch and orbits of the satellites Prognoz—measurements out of the magnetosphere.

SatelliteDate of launch Initial apogee altitude (103 km) Orbital period (days) Time of active operation (months)

Prognoz-114.04.1972200 44,4
Prognoz-229.06.1972200 45,5
Prognoz-315.02.1973200 412,5
Prognoz-422.12.1975200 42,5
Prognoz-525.11.1976200 47,8
Prognoz-622.09.1977200 45,3
Prognoz-730.10.1978200 46,8
Prognoz-825.12.1980200 48,8
Prognoz-901.07.1983720 278,0
Prognoz-1026.04.1985200 49,3