Electronic surveillance spacecraft

The development of spacecraft for electronic surveillance of radar systems was split into two phases:

Phase 1 included development of electronic surveillance spacecraft, based on experience in developing the unified DS-U1 and DS-U2 spacecraft, and launch of two experimental DS-K 40 spacecraft. Both launches were unsuccessful due to launch vehicle failure. Phase 2 included development of electronic surveillance spacecraft for the Tselina system. The spacecraft incorporated much lighter payload instrumentation based on microcomponents.

The Tselina-О, Tselina-D, Tselina-2, and Tselina-R spacecraft met all objectives of electronic surveillance.

Tselina-О

Mass, kg	339…434
Active life, months	6
Launch vehicle	11К65М
Main experimental results	Electronic surveillance. The Tselina-O spacecraft was upgraded. New instrumentation was provided for Tselina-OM and Tselina-OK spacecraft.
Orbited on	30 October 1967