Kosmos 869 ( meaning Cosmos 869) was an uncrewed military Soyuz 7K-S test. It was a somewhat successful mission. This was the third and final test flight of a new Soyuz spacecraft type 7K-S. It was designed to be a spaceship for military solo missions. At the time of the launch the program had already been discontinued. The completed spaceships were launched as uncrewed test flights: Kosmos 670, Kosmos 772 and Kosmos 869. The experience from these flights were used in the development of the successor program Soyuz spacecraft the Soyuz 7K-ST.

Mission parameters

• Spacecraft: Soyuz 7K-S.

• Mass: 6800kg.

• Crew: None.

• Launched: November 29, 1976.

• Landed: December 17, 1976 10:31 UTC.

• Perigee: 209km.

• Apogee: 289km.

• Inclination: 51.7 deg.

• Duration: 17.99 days.

Maneuver Summary

• 196km X 290km orbit to 187km X 335km orbit. Delta V: 15m/s.

• 187km X 335km orbit to 259km X 335km orbit. Delta V: 21m/s.

• 259km X 335km orbit to 260km X 345km orbit. Delta V: 2m/s.

• 260km X 345km orbit to 265km X 368km orbit. Delta V: 7m/s.

• 265km X 368km orbit to 267km X 391km orbit. Delta V: 6m/s.

• 267km X 391km orbit to 300km X 310km orbit. Delta V: 32m/s.

Total Delta V: 83m/s.

See also

• Cosmos 670

• Cosmos 772

References