Beskrivning : The Tselina-D (11F619) was one component of two-satellite Tselina ELINT satellite system. Tselina-D provided detailed observation of radio sources detected by the smaller Tselina-O satellites. Tselina-D and -O spacecraft were operated simultaneously to provide surveillance and detailed observation and classification of radio emitters. Recorded data was stored on board and dumped to groundstations in the USSR.