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SL-12 R/B(1)
Launch Details
| Launched | 20 December 1984 |
| Flight ended | 22 December 1984 |
| Status | Decayed |
| Launch site | Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome) |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 15451 |
| COSPAR ID | 1984-128C |
| Observing |
Timeline
| 1984 Jun 13 | – | Descent module separated from flyby probe |
| 1984 Jun 15 | – | Descent module entered Venus's atmosphere |
| 1984 Jun 15 | – | Balloon deployed into Venus's atmosphere |
| 1984 Jun 15 | – | Lander mission ended, after returning data from the surface for 56 minutes |
| 1984 Jun 15 | – | Balloon mission ended |
| 1984 Jun 15 | – | Orbiter flyby of Venus |
| 1984 Dec 21 | – | Launch from Site 200/40 at the Baikonur Cosmodrome |
| 1986 Mar 9 | – | Flyby of Comet 1P/Halley |
| 1987 Mar 24 | – | Last contact with the flyby probe |