Proton-K/DM from Baikonur lofted Kosmos 1629, a US-KS (Oko-S) geosynchronous missile early-warning satellite for the Soviet military that watched for ballistic-missile launches.
- Outcome
- Success
- Orbit
- Direct-GEO
- Geostationary orbit
- Payload to orbit
- 2.1 T (est.)
- Flight
- 51st
- of 66 Proton-K/DM flights
- Date and time
- 21 February 1985, 07:56 UTC
- Rocket
- Proton-K/DM
- Builder
- Khrunichev
- Launch site
- 200/39 (200L), Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Government/Top Secret
- International designator
- 1985-016
- Launches in 1985
- 16th of 125
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