Kosmos 903 (US-K #6), a Soviet Oko missile early-warning satellite on a highly elliptical Molniya orbit. Molniya-M/Blok-2BL from Plesetsk Site 43/3 deployed the IR-telescope craft as the sixth HEO US-K, part of the 1977 prototype constellation effort.
- Outcome
- Success
- Orbit
- Elliptical
- Elliptical orbit
- Payload to orbit
- 1.6 T (est.)
- Flight
- 84th
- of 272 Molniya-M 2BL flights
- Date and time
- 11 April 1977, 01:38 UTC
- Rocket
- Molniya-M 2BL
- Builder
- Progress RSC
- Launch site
- 43/3 (43L), Plesetsk Cosmodrome, Russian Federation
- Payload
- Government/Top Secret
- International designator
- 1977-027
- Launches in 1977
- 28th of 130
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