Molniya-M/Blok-2BL from Plesetsk Site 41/1 launched Kosmos 1261, a US-K (Oko) early-warning satellite for the Soviet missile-attack warning network into a highly elliptical Molniya orbit.
- Outcome
- Success
- Orbit
- Elliptical
- Elliptical orbit
- Payload to orbit
- 1.6 T (est.)
- Flight
- 124th
- of 272 Molniya-M 2BL flights
- Date and time
- 31 March 1981, 09:39 UTC
- Rocket
- Molniya-M 2BL
- Builder
- Progress RSC
- Launch site
- 41/1, Plesetsk Cosmodrome, Russian Federation
- Payload
- Government/Top Secret
- International designator
- 1981-031
- Launches in 1981
- 33rd of 126
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