| Mission type | Early warning |
|---|---|
| COSPAR ID | 1985-084A |
| SATCATno. | 16064 |
| Mission duration | 4 years[1] |
| Spacecraft properties | |
| Spacecraft type | US-K[2] |
| Launch mass | 1,900 kilograms (4,200 lb)[3] |
| Start of mission | |
| Launch date | 24 September 1985, 01:18 (1985-09-24UTC01:18Z) UTC |
| Rocket | Molniya-M/2BL[2] |
| Launch site | Plesetsk Cosmodrome[2][3] |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Molniya[2] |
| Perigee altitude | 597 kilometres (371 mi)[4] |
| Apogee altitude | 39,753 kilometres (24,701 mi)[4] |
| Inclination | 62.9 degrees[4] |
| Period | 717.68 minutes[4] |
Kosmos 1684 (Russian:Космос 1684 meaningCosmos 1684) is a SovietUS-K missileearly warningsatellite which was launched in 1985 as part of the Soviet military'sOko programme. The satellite is designed to identify missile launches usingoptical telescopes andinfrared sensors.[2]
Kosmos 1684 was launched fromSite 43/4 atPlesetsk Cosmodrome in the Russian SSR.[5] AMolniya-M carrier rocket with a2BL upper stage was used to perform the launch, which took place at 01:18 UTC on 24 September 1985.[3] The launch successfully placed the satellite into amolniya orbit. It subsequently received itsKosmos designation, and theinternational designator 1985-084A.[3] TheUnited States Space Command assigned it theSatellite Catalog Number 16064.[3]
