Kosmos 1669


Kosmos 1669
Mission typeSalyut 7 resupply
COSPAR ID1985-062A
SATCAT no.15918
Mission duration42 days
Spacecraft properties
SpacecraftProgress s/n 126
Spacecraft typeProgress 7K-TG
ManufacturerNPO Energia
Launch mass7280 kg
Dry mass7020 kg
Payload mass2500 kg
Dimensions7.48 m in length and
2.72 m in diameter
Start of mission
Launch date19 July 1985, 13:05 UTC
RocketSoyuz-U s/n B15000-446
Launch siteBaikonur 1/5
End of mission
Decay date30 August 1985, 01:20 UTC
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude298 km
Apogee altitude358 km
Period91.0 minutes
Epoch19 July 1985
Docking with Salyut 7
Docking portAft
Docking date21 July 1985, 15:05 UTC
Undocking date28 August 1985, 21:50 UTC
Time docked38 days
Mass2500 kg

Kosmos-1669 (Russian: Космос-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 1985. Following undocking on 28 August 1985, 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 1985, 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 spacesuit, 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 spacecraft. The next following mission of a Progress cargo spacecraft, 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


  1. ^ a b c Wade, Mark. "Progress". Encyclopedia Astronautica. Retrieved 11 April 2009.
  2. ^ Christy, Robert. "Third Expedition to Salyut 7 - 1984". Zarya. Retrieved 11 April 2009.
  3. ^ a b c Portree, David S. F (March 1995). "Mir Hardware Heritage". NASA. Archived from the original on 6 April 2002. Retrieved 11 April 2009. Public Domain This article incorporates text from this source, which is in the public domain.
  4. ^ Christy, Robert. "Fourth Expedition to Salyut 7 - 1985". Zarya. Retrieved 11 April 2009.
  5. ^ "New Soviet Craft Docks With Salyut". New York Times. 23 July 1985. Retrieved 11 April 2009.