Molniya-M (Blok-2BL) from Plesetsk launched Kosmos 1729, a US-K (Oko) early-warning satellite into a highly elliptical Molniya orbit to detect ballistic-missile launches for the Soviet military.
- Outcome
- Success
- Orbit
- Elliptical
- Elliptical orbit
- Payload to orbit
- 1.6 T (est.)
- Flight
- 183rd
- of 272 Molniya-M 2BL flights
- Date and time
- 1 February 1986, 18:11 UTC
- Rocket
- Molniya-M 2BL
- Builder
- Progress RSC
- Launch site
- 16/2, Plesetsk Cosmodrome, Russian Federation
- Payload
- Government/Top Secret
- International designator
- 1986-011
- Launches in 1986
- 12th of 110
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