Kosmos 869
Unmanned test flight of the Soyuz 7K-S spacecraft
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Kosmos 869 (Russian: Космос 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.[1][2][3][4][5][6]
| Mission type | Orbital test flight |
|---|---|
| Operator | Soviet space program |
| COSPAR ID | 1976-114A |
| SATCAT no. | 9564 |
| Mission duration | 17 days, 18 hours and 31 minutes |
| Spacecraft properties | |
| Spacecraft type | Soyuz 7K-S s/n 3L |
| Manufacturer | NPO Energia |
| Launch mass | 6,800 kg (15,000 lb) |
| Start of mission | |
| Launch date | 29 November 1976, 16:00 GMT |
| Rocket | Soyuz-U |
| Launch site | Baikonur 1/5 |
| End of mission | |
| Disposal | Deorbited |
| Landing date | 17 December 1976, 10:31 GMT |
| Orbital parameters | |
| Reference system | Geocentric |
| Perigee altitude | 209 km (130 mi) |
| Apogee altitude | 289 km (180 mi) |
| Inclination | 51.7° |
| Period | 89.4 min |
Mission parameters
Maneuver Summary
- 196 km X 290 km orbit to 187 km X 335 km orbit. Delta V: 15 m/s.
- 187 km X 335 km orbit to 259 km X 335 km orbit. Delta V: 21 m/s.
- 259 km X 335 km orbit to 260 km X 345 km orbit. Delta V: 2 m/s.
- 260 km X 345 km orbit to 265 km X 368 km orbit. Delta V: 7 m/s.
- 265 km X 368 km orbit to 267 km X 391 km orbit. Delta V: 6 m/s.
- 267 km X 391 km orbit to 300 km X 310 km orbit. Delta V: 32 m/s.
Total Delta V: 83 m/s.
