Intercosmos 21 was the name of a Soviet artificial satellite built with the AUOS bus and launched under the Intercosmos program of international cooperation on February 6, 1981 from the Plesetsk cosmodrome by means of a Kosmos 3 rocket. Czechoslovakia, Hungary, Romania and the German Democratic Republic. It reentered the atmosphere on July 7, 1982. goals
The mission of Intercosmos 21, like that of Intercosmos 20, was to test new methods for the study of the oceans and the surface of the earth, also proving the collection of automatic data from terrestrial and maritime stations. >
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