Gorizont 4 (Gorizont 15L), a Soviet geostationary communications satellite, launched on a Proton-K/DM from Baikonur Site 200/39 to provide telephone, telegraph, TV, and military relay services; operated until October 1988.
- Outcome
- Success
- Orbit
- Direct-GEO
- Geostationary orbit
- Payload to orbit
- 2.9 T
- Flight
- 20th
- of 66 Proton-K/DM flights
- Date and time
- 14 June 1980, 00:49 UTC
- Rocket
- Proton-K/DM
- Builder
- Khrunichev
- Launch site
- 200/39 (200L), Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Communications
- International designator
- 1980-049
- Launches in 1980
- 50th of 108
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