| Progress M-21 | |
| Mission Type: | Mir resupply |
| Cospar Id: | 1994-005A |
| Satcat: | 22975[1] |
| Spacecraft: | Progress (No.221) |
| Spacecraft Type: | Progress-M[2] |
| Manufacturer: | RKK Energia |
| Launch Date: | 28 January 1994, 02:12:10 UTC |
| Launch Rocket: | Soyuz-U |
| Launch Site: | Baikonur, Site 1/5 |
| Docking: | |
| Disposal Type: | Deorbited |
| Decay Date: | 23 March 1994, 05:13 UTC |
| Orbit Epoch: | 28 January 1994 |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Low Earth |
| Orbit Periapsis: | 194 km |
| Orbit Apoapsis: | 236 km |
| Orbit Inclination: | 51.6° |
| Orbit Period: | 88.5 minutes |
| Apsis: | gee |
| Programme: | Progress (spacecraft) |
| Previous Mission: | Progress M-20 |
| Next Mission: | Progress M-22 |
Progress M-21 was a Russian unmanned Progress cargo spacecraft, which was launched in January 1994 to resupply the Mir space station.
Progress M-21 launched on 28 January 1994 from the Baikonur Cosmodrome in Kazakhstan. It used a Soyuz-U rocket.
Progress M-21 docked with the aft port of the Kvant-1 module of Mir on 30 January 1994 at 03:56:13 UTC, and was undocked on 23 March 1994 at 01:20:29 UTC.[4] [5]
It remained in orbit until 23 March 1994, when it was deorbited. The deorbit burn occurred at 04:23 UTC, and the mission ended at 05:13 UTC.