| Kosmos 1669 | |||||||||
| Mission Type: | Salyut 7 resupply | ||||||||
| Operator: | OKB-1 | ||||||||
| Cospar Id: | 1985-062A | ||||||||
| Satcat: | 15918 | ||||||||
| Spacecraft: | Progress s/n 126 | ||||||||
| Spacecraft Type: | Progress 7K-TG | ||||||||
| Manufacturer: | NPO Energia | ||||||||
| Dry Mass: | 7020 kg | ||||||||
| Launch Mass: | 7280 kg | ||||||||
| Payload Mass: | 2500 kg | ||||||||
| Dimensions: | 7.48 m in length and 2.72 m in diameter | ||||||||
| Launch Date: | 19 July 1985, 13:05 UTC | ||||||||
| Launch Rocket: | Soyuz-U s/n B15000-446 | ||||||||
| Launch Site: | Baikonur 1/5 | ||||||||
| Launch Contractor: | OKB-1 | ||||||||
| Disposal Type: | Deorbited | ||||||||
| Decay Date: | 30 August 1985, 01:20 UTC | ||||||||
| Orbit Epoch: | 19 July 1985 | ||||||||
| Orbit Reference: | Geocentric | ||||||||
| Orbit Regime: | Low Earth | ||||||||
| Orbit Periapsis: | 298 km | ||||||||
| Orbit Apoapsis: | 358 km | ||||||||
| Orbit Inclination: | 51.66° | ||||||||
| Orbit Period: | 91.0 minutes | ||||||||
| Apsis: | gee | ||||||||
| Docking: |
| ||||||||
| Cargo Mass: | 2500 kg | ||||||||
| Programme: | Progress (spacecraft) | ||||||||
| Previous Mission: | Progress 24 | ||||||||
| Next Mission: | Progress 25 | ||||||||
| Programme2: | Kosmos (satellites) | ||||||||
| Previous Mission2: | Kosmos 1668 | ||||||||
| Next Mission2: | Kosmos 1670 | ||||||||
Kosmos 1669 (Russian: Космос-1669|italic=yes) 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]