_1200dpi.jpg) Gorizont on a 1991 Soviet stamp | |
| Names | Горизонт Horizon 11F662 |
|---|---|
| Mission type | Communications |
| Operator | Russian Satellite Communications Company (RSCC) |
| Mission duration | 3 years (planned) |
| Spacecraft properties | |
| Spacecraft | Gorizont |
| Bus | KAUR-3 |
| Manufacturer | NPO PM (ISS Reshetnev) |
| Launch mass | 2,110 kg (4,650 lb) |
| Start of mission | |
| Launch date | 1978 - 2000 |
| Rocket | Proton |
| Launch site | Baikonur |
| Contractor | Khrunichev |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Geostationary orbit |
| Transponders | |
| Coverage area | Soviet Union, Russia |
Gorizont (Russian:Горизонт,lit. 'horizon'),GRAU index 11F662, was a series of 35 Russian, previouslySoviet,geosynchronouscommunications satellites launched between 1978 and 2000. The program was started in order to develop a satellite system to relay coverage of the1980 Olympic Games fromMoscow. The first four satellites were originally launched for this sole purpose.[1] Following this, the Gorizont system was integrated into the YeSSS Unified Satellite Communication System,[1] and was used to relay both civilian and military communications. From 1988 onwards, the satellites were also used in support of the Okean program.[1]
Gorizont satellites were based on theKAUR-3satellite bus, which providedthree-axis stabilisation, and liquid maneuvering engines.[1] The Gorizontsatellite constellation was replaced by theEkspress constellation. The first satellite Gorizont-11L was launched on 19 December 1978 and the last satellite launched wasGorizont No.45L on 6 June 2000.
Following the 1980 Olympics, some of the surplusC-Band capacity on the satellites was used to distributeTelevision in the Soviet Union both to relay transmitters within theUSSR (where the vast physical size of the country made conventional distribution to remote areas difficult) and to otherEastern Bloc and allied countries for relay to Soviet troops stationed there. Later programming from otherWarsaw Pact countries andCuba were added. Signals from these satellites spread well outside their intended area and were for a time very popular with early domesticsatellite television enthusiasts inWestern Europe as these were among the first such signals to be receivable there.[2] In this application, Gorizont was (except at highlatitudes) the successor to theOrbita system which used non-geostationaryMolniya satellites. Gorizont represented an improvement in channel capacity and could be picked up on less elaborate receiving systems.
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