Kosmos 1669

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Kosmos 1669
Mission type Salyut 7 resupply
COSPAR ID 1985-062A
Spacecraft properties
Spacecraft type Progress 7K-TG
Manufacturer NPO Energia
Start of mission
Launch date 19 July 1985, 13:05 (1985-07-19UTC13:05Z) UTC
Rocket Soyuz-U
Launch site Baikonur 1/5
End of mission
Disposal Deorbited
Decay date 30 August 1985, 01:20 (1985-08-30UTC01:21Z) UTC
Orbital parameters
Reference system Geocentric
Regime Low Earth
Perigee 354 kilometres (220 mi)
Apogee 358 kilometres (222 mi)
Inclination 51.6 degrees
Docking with Salyut 7
Docking port Aft
Docking date 21 July 1985, 15:05 UTC
Undocking date 28 August 1985
Time docked 1 month
Docking with Salyut 7
Docking port Aft
Docking date 28 August 1985
Undocking date 28 August 1985, 21:50 UTC

Kosmos-1669 (Russian: Космос-1669 meaning Cosmos 1669) was a Progress spacecraft used to resupply the Salyut 7 space station. It was a Progress 7K-TG spacecraft with the serial number 126.

Kosmos-1669 was launched by a Soyuz-U carrier rocket from Site 1/5 at the Baikonur Cosmodrome, at 13:05 UTC on 19 July 1985. The spacecraft docked with the aft port of Salyut 7 at 15:05 UTC on 21 July. Following undocking on 28 August, it moved away from the station, before returning and redocking to test the reliability of the docking system.[1] It undocked for a second time at 21:50 UTC,[2] and was deorbited on 30 August, with the spacecraft burning up over the Pacific Ocean at 01:20 UTC.

Kosmos-1669 was the second cargo spacecraft (after Progress 24) to visit Salyut 7 after its reactivation, and also the last Progress flight as part of the Salyut programme. It delivered new spacesuits, to replace ones damaged by cold temperatures whilst Salyut 7 was deactivated,[3] as well as replacement parts and consumables. This Progress mission was followed by one last cargo mission to Salyut 7, but carried out by an TKS spacecraft: TKS-4, which would become the fourth and last flight of an TKS craft. The next following mission of a Progress cargo craft, Progress 25, flew to Mir.[1]

As of 2009, Kosmos-1669 is the only Progress spacecraft to have received a Kosmos designation, which are usually reserved for military, experimental and failed spacecraft. It has been reported that this may have been an error due to confusion with a TKS spacecraft which later became Kosmos 1686,[4] or that the spacecraft may have gone out of control shortly after launch, but then been recovered after the Kosmos designation had been applied.[1] Alternatively, it could have been given the designation as it was used to test modifications that would be used on future Progress missions.[3] Some news agencies reported that it was a free-flying Progress-derived spacecraft,[3] or that it was a new type of spacecraft derived from the Progress.[5]

See also[edit]


  1. ^ a b c Wade, Mark. "Progress". Encyclopedia Astronautica. Retrieved 2009-04-11. 
  2. ^ Christy, Robert. "Third Expedition to Salyut 7 - 1984". Zarya. Retrieved 2009-04-11. 
  3. ^ a b c Portree, David S. F (March 1995). "Mir Hardware Heritage". NASA. Retrieved 2009-04-11. 
  4. ^ Christy, Robert. "Fourth Expedition to Salyut 7 - 1985". Zarya. Retrieved 2009-04-11. 
  5. ^ "New Soviet Craft Docks With Salyut". New York Times. 1985-07-23. Retrieved 2009-04-11.