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
Progress drawing.svg
A Progress 7K-TG spacecraft
Mission typeMir resupply
COSPAR ID1987-066A Edit this at Wikidata
SATCAT no.18283[1]
Spacecraft properties
SpacecraftProgress (No.138)
Spacecraft typeProgress 7K-TG[2]
ManufacturerNPO Energia
Start of mission
Launch date3 August 1987, 20:44:11 UTC[1]
Launch siteBaikonur, Site 1/5
End of mission
Decay date23 September 1987, 00:22:00 UTC[3]
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude187 km[3]
Apogee altitude250 km[3]
Period88.9 minutes[3]
Epoch3 August 1987
Docking with Mir
Docking portKvant-1 aft[3]
Docking date5 August 1987, 22:27:35 UTC
Undocking date21 September 1987, 23:57:41 UTC


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


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]


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 alsoEdit


  1. ^ a b "Launchlog". Jonathan's Space Report. Retrieved 6 December 2020.
  2. ^ a b c "Progress 1 - 42 (11F615A15, 7K-TG)". Gunter's Space Page. Retrieved 6 December 2020.
  3. ^ a b c d e f g h "Cargo spacecraft "Progress 31"". Manned Astronautics figures and facts. Archived from the original on 9 October 2007.
  4. ^ "Progress 31". NASA. Retrieved 6 December 2020.   This article incorporates text from this source, which is in the public domain.
  5. ^ a b "Mir". Astronautix. Archived from the original on 20 August 2016. Retrieved 6 December 2020.