Kosmos 391
| Mission type | ABM radar target |
|---|---|
| COSPAR ID | 1971-002A |
| SATCAT no. | 04847 |
| Spacecraft properties | |
| Spacecraft type | DS-P1-I |
| Manufacturer | Yuzhnoye |
| Launch mass | 300 kilograms (660 lb) |
| Start of mission | |
| Launch date | 14 January 1971, 12:00:00 UTC |
| Rocket | Kosmos-2I 63SM |
| Launch site | Plesetsk 133/1 |
| End of mission | |
| Decay date | 21 February 1971 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 267 kilometres (166 mi) |
| Apogee altitude | 803 kilometres (499 mi) |
| Inclination | 70.9 degrees |
| Period | 95.3 minutes |
Kosmos 391 (Russian: Космос 391 meaning Cosmos 391), also known as DS-P1-I No.11 was a satellite which was used as a radar target for anti-ballistic missile tests. It was launched by the Soviet Union in 1971 as part of the Dnepropetrovsk Sputnik programme.