| Progress M-40 | |
| Mission Type: | Mir resupply |
| Cospar Id: | 1998-062A |
| Satcat: | 25512[1] |
| Spacecraft: | Progress (No.239) |
| Spacecraft Type: | Progress-M[2] |
| Manufacturer: | RKK Energia |
| Launch Date: | 25 October 1998, 04:14:57 UTC |
| Launch Rocket: | Soyuz-U |
| Launch Site: | Baikonur, Site 1/5 |
| Docking: | |
| Disposal Type: | Deorbited |
| Decay Date: | 5 February 1999, 10:16:05 UTC |
| Orbit Epoch: | 25 October 1998 |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Low Earth |
| Orbit Periapsis: | 194 km |
| Orbit Apoapsis: | 238 km |
| Orbit Inclination: | 51.6° |
| Orbit Period: | 88.6 minutes |
| Apsis: | gee |
| Programme: | Progress (spacecraft) |
| Previous Mission: | Progress M-39 |
| Next Mission: | Progress M-41 |
Progress M-40 was a Russian unmanned Progress cargo spacecraft, which was launched in October 1998 to resupply the Mir space station, carry the Sputnik 41 satellite[4] and the unsuccessful Znamya 2.5 solar mirror.
Progress M-40 launched on 25 October 1998 from the Baikonur Cosmodrome in Kazakhstan. It used a Soyuz-U rocket.[5]
Progress M-40 docked with the aft port of the Kvant-1 module of Mir on 27 October 1998 at 05:34:41 UTC, and was undocked on 4 February 1999 at 09:59:32 UTC.[6] On 4 February 1999 at 10:24 UTC, following undocking from Mir, an unsuccessful attempt was made to deploy Znamya 2.5, a solar mirror.
It remained in orbit until 5 February 1999, when it was deorbited. The deorbit burn occurred at 10:16:05 UTC, with the mission ending at 11:09:30 UTC.