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Spacecraft information: PROGRESS 21
Launch Details
| Launched | 6 May 1984 |
| Flight ended | 25 May 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 | 14961 |
| COSPAR ID | 1984-042A |
| Observing |
Launched alongside
SL-4 R/B