Progress 21
Soviet unmanned Progress cargo spacecraft
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Progress 21 (Russian: Прогресс 21) was a Soviet uncrewed Progress cargo spacecraft, which was launched in May 1984 to resupply the Salyut 7 space station.
A Progress 7K-TG spacecraft | |
| Mission type | Salyut 7 resupply |
|---|---|
| COSPAR ID | 1984-042A |
| SATCAT no. | 14961[1] |
| Spacecraft properties | |
| Spacecraft | Progress (No.116) |
| Spacecraft type | Progress 7K-TG[2] |
| Manufacturer | NPO Energia |
| Start of mission | |
| Launch date | 7 May 1984, 22:47:15 UTC[1] |
| Rocket | Soyuz-U[2] |
| Launch site | Baikonur, Site 31/6 |
| End of mission | |
| Disposal | Deorbited |
| Decay date | 26 May 1984, 15:00:30 UTC[3] |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 187 km[3] |
| Apogee altitude | 246 km[3] |
| Inclination | 51.6°[3] |
| Period | 88.8 minutes[3] |
| Epoch | 26 May 1984 |
| Docking with Salyut 7 | |
| Docking port | Aft[3] |
| Docking date | 10 May 1984, 00:10 UTC |
| Undocking date | 26 May 1984, 09:41 UTC |
Launch
Progress 21 launched on 7 May 1984 from the Baikonur Cosmodrome in the Kazakh SSR. It used a Soyuz-U rocket.[2][4]
