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SL-12 R/B
Launch Details
| Launched | 27 May 1971 |
| Flight ended | 30 May 1971 |
| Status | Decayed |
| Launch site | Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome) |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 5255 |
| COSPAR ID | 1971-049B |
| Observing |
Timeline
| 1971 May 28 | – | Launch from Baikonur Cosmodrome |
| 1971 Nov 27 | – | Release of decent module |
| 1971 Dec 2 | – | Release of decent module |
| 1971 Dec 2 | – | Insertion into orbit around Mars |
| 1971 Dec 2 | – | Landing of decent module on surface of Mars |
| 1971 Dec 2 | – | Failure of lander, 14.5 seconds after landing |
| 1972 Aug 22 | – | Orbiter spacecraft decommissioned |