| Progress 21 | |||||||||
| Mission Type: | Salyut 7 resupply | ||||||||
| Cospar Id: | 1984-042A | ||||||||
| Satcat: | 14961[1] | ||||||||
| Spacecraft: | Progress (No.116) | ||||||||
| Spacecraft Type: | Progress 7K-TG[2] | ||||||||
| Manufacturer: | NPO Energia | ||||||||
| Launch Date: | 7 May 1984, 22:47:15 UTC | ||||||||
| Launch Rocket: | Soyuz-U | ||||||||
| Launch Site: | Baikonur, Site 31/6 | ||||||||
| Docking: |
| ||||||||
| Disposal Type: | Deorbited | ||||||||
| Decay Date: | 26 May 1984, 15:00:30 UTC | ||||||||
| Orbit Epoch: | 26 May 1984 | ||||||||
| Orbit Reference: | Geocentric | ||||||||
| Orbit Regime: | Low Earth | ||||||||
| Orbit Periapsis: | 187 km | ||||||||
| Orbit Apoapsis: | 246 km | ||||||||
| Orbit Inclination: | 51.6° | ||||||||
| Orbit Period: | 88.8 minutes | ||||||||
| Apsis: | gee | ||||||||
| Programme: | Progress (spacecraft) | ||||||||
| Previous Mission: | Progress 20 | ||||||||
| Next Mission: | Progress 22 | ||||||||
Progress 21 was a Soviet uncrewed Progress cargo spacecraft, which was launched in May 1984 to resupply the Salyut 7 space station.
Progress 21 launched on 7 May 1984 from the Baikonur Cosmodrome in the Kazakh SSR. It used a Soyuz-U rocket.[4]
Progress 21 docked with the aft port of Salyut 7 on 10 May 1984 at 00:10 UTC, and was undocked on 26 May 1984 at 09:41 UTC.[5]
It remained in orbit until 26 May 1984, when it was deorbited. The deorbit burn occurred at 15:00:30 UTC, with the mission ending at around 15:45 UTC.