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Kosmos 775 (Russian: Космос 775 meaning Cosmos 775) is a Soviet US-KS missile early warning satellite which was launched in 1975 as part of the Oko programme. The satellite is designed to identify missile launches using optical telescopes and infrared sensors.[1]
| Mission type | Early warning |
|---|---|
| Operator | VKS |
| COSPAR ID | 1975-097A |
| SATCAT no. | 8357 |
| Mission duration | failed |
| Spacecraft properties | |
| Spacecraft type | US-KS (74Kh6)[1] |
| Manufacturer | Lavochkin[1] |
| Launch mass | 2,400 kilograms (5,300 lb)[1] |
| Start of mission | |
| Launch date | 8 October 1975, 00:30:00 UTC[2] |
| Rocket | Proton-K/DM |
| Launch site | Baikonur 81/23 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Geostationary |
| Instruments | |
| Optical telescope with 50 centimetres (20 in) aperture [1] Infrared sensor/s [1] Smaller telescopes[1] | |
Kosmos 775 was launched from Site 81/23 at Baikonur Cosmodrome in the Kazakh SSR.[1] A Proton-K carrier rocket with a DM upper stage was used to perform the launch, which took place at 00:30 UTC on 8 October 1975.[2][3] The launch attempted to place the satellite into geostationary orbit. It subsequently received its Kosmos designation, and the international designator 1975-097A.[2] The United States Space Command assigned it the Satellite Catalog Number 8357.[2][3]
It was the first US-KS satellite and was never operational. Podvig says its orbit was never stabilised,[3] NASA's National Space Science Data Centre says it exploded.[2] The next launch of one of these craft was Kosmos 1546 in 1984.
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