Kosmos 931, a US-K (Oko) early-warning satellite for detecting ballistic-missile launches, launched on a Molniya-M/2BL from Plesetsk Site 43/4 into a highly elliptical Molniya-type orbit for the Soviet Oko constellation.
- Outcome
- Success
- Orbit
- Elliptical
- Elliptical orbit
- Payload to orbit
- 1.6 T (est.)
- Flight
- 88th
- of 272 Molniya-M 2BL flights
- Date and time
- 20 July 1977, 04:44 UTC
- Rocket
- Molniya-M 2BL
- Builder
- Progress RSC
- Launch site
- 43/4 (43R), Plesetsk Cosmodrome, Russian Federation
- Payload
- Government/Top Secret
- International designator
- 1977-068
- Launches in 1977
- 69th of 130
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