| Mission type | Early warning |
|---|---|
| COSPAR ID | 1985-088A |
| SATCATno. | 16103 |
| 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 | 30 September 1985, 19:23 (1985-09-30UTC19:23Z) UTC |
| Rocket | Molniya-M/2BL[2] |
| Launch site | Plesetsk Cosmodrome[2][3] |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Molniya[2] |
| Perigee altitude | 640 kilometres (400 mi)[4] |
| Apogee altitude | 39,712 kilometres (24,676 mi)[4] |
| Inclination | 62.9 degrees[4] |
| Period | 717.72 minutes[4] |
Kosmos 1687 (Russian:Космос 1687 meaningCosmos 1687) 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 1687 was launched fromSite 16/2 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 19:23 UTC on 30 September 1985.[3] The launch successfully placed the satellite into amolniya orbit. It subsequently received itsKosmos designation, and theinternational designator 1985-088A.[3] TheUnited States Space Command assigned it theSatellite Catalog Number 16103.[3]
