Kosmos 775 (US-KS #1), the first Soviet geostationary Oko early-warning satellite—an experimental GEO complement to HEO US-K. Proton-K/Blok-DM from Baikonur Site 81/23 placed the craft in GEO on 8 October 1975 to test infrared missile-launch detection from geosynchronous orbit.
- Outcome
- Success
- Orbit
- Direct-GEO
- Geostationary orbit
- Payload to orbit
- 2.1 T (est.)
- Flight
- 3rd
- of 66 Proton-K/DM flights
- Date and time
- 8 October 1975, 00:30 UTC
- Rocket
- Proton-K/DM
- Builder
- Khrunichev
- Launch site
- 81/23 (81L), Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Government/Top Secret
- International designator
- 1975-097
- Launches in 1975
- 101st of 132
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