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COSMOS 257
Launch Details
| Launched | 2 December 1968 |
| Flight ended | 4 March 1969 |
| Status | Decayed |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 3578 |
| COSPAR ID | 1968-107A |
| Observing |
Launched alongside
SL-7 R/B