Progress 31

Progress 31 (Russian: Прогресс 31) was a Soviet uncrewed Progress cargo spacecraft, which was launched in August 1987 to resupply the Mir space station.

Progress 31

A Progress 7K-TG spacecraft
Mission type	Mir resupply
COSPAR ID	1987-066A
SATCAT no.	18283[1]
Spacecraft properties
Spacecraft	Progress (No.138)
Spacecraft type	Progress 7K-TG[2]
Manufacturer	NPO Energia
Start of mission
Launch date	3 August 1987, 20:44:11 UTC[1]
Rocket	Soyuz-U2[2]
Launch site	Baikonur, Site 1/5
End of mission
Disposal	Deorbited
Decay date	23 September 1987, 00:22:00 UTC[3]
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Perigee altitude	187 km[3]
Apogee altitude	250 km[3]
Inclination	51.6°[3]
Period	88.9 minutes[3]
Epoch	3 August 1987
Docking with Mir
Docking port	Kvant-1 aft[3]
Docking date	5 August 1987, 22:27:35 UTC
Undocking date	21 September 1987, 23:57:41 UTC
Progress (spacecraft) ← Progress 30 Progress 32 →

Launch

Progress 31 launched on 3 August 1987 from the Baikonur Cosmodrome in the Kazakh SSR. It used a Soyuz-U2 rocket.^[2][4]

Docking

Progress 31 docked with the aft port of the Kvant-1 module of Mir on 5 August 1987 at 22:27:35 UTC, and was undocked on 21 September 1987 at 23:57:41 UTC.^[3][5]

Decay

It remained in orbit until 23 September 1987, when it was deorbited. The deorbit burn occurred at 00:22:00 UTC and the mission ended at 01:02 UTC.^[3][5]

See also

• Spaceflight portal

• 1987 in spaceflight
• List of Progress missions
• List of uncrewed spaceflights to Mir