| Names | ECS-4 European Communications Satellite-4 Eutelsat 4 |
|---|---|
| Mission type | Communications |
| Operator | ESA /Eutelsat |
| COSPAR ID | 1987-078B |
| SATCATno. | 18351 |
| Website | https://www.eutelsat.com/en/home.html |
| Mission duration | 7 years (planned) 15 years (achieved) |
| Spacecraft properties | |
| Spacecraft | ECS-4 |
| Spacecraft type | ECS |
| Bus | ECS-Bus |
| Manufacturer | British Aerospace |
| Launch mass | 1,185 kg (2,612 lb)[1] |
| Dry mass | 500 kg (1,100 lb) |
| Dimensions | 1.9 m x 1.4 m x 2.3 m Span on orbit: 13.8 m |
| Power | 1kW |
| Start of mission | |
| Launch date | 16 September 1987, 00:45:28UTC[2] |
| Rocket | Ariane 3 (V19) |
| Launch site | Centre Spatial Guyanais,ELA-1 |
| Contractor | Arianespace |
| Entered service | November 1987 |
| End of mission | |
| Disposal | Graveyard orbit |
| Deactivated | November 2002 |
| Orbital parameters | |
| Reference system | Geocentric orbit[3] |
| Regime | Geostationary orbit |
| Longitude | 10° East (1987–1988) 13° East (1988–1990) 7° East (1990–1992) 25.5° East (1993–2000) 33° (2000–2002)[1] |
| Transponders | |
| Band | 12Ku-band |
| Bandwidth | 72MHz |
| Coverage area | Europe, the Middle East and Africa |
Eutelsat I F-4, also known asEuropean Communications Satellite-4 (ECS-4) is a decommissionedcommunications satellite operated by theEuropean Telecommunications Satellite Organisation (Eutelsat). Launched in 1987, it was operated ingeostationary orbit at alongitude of 10° East, before moving to several other locations later in its operational life, before it was finally decommissioned in 2002. It was the fourth of five satellites launched to form the first-generation Eutelsat constellation.
TheEuropean Telecommunications Satellite Organization (Eutelsat) has been servicing theEuropean Economic Community (CEE) since 1977, being formally established by a multi-lateral agreement in 1985. In 1979,European Space Agency (ESA) agreed to design, build, and launch five ECS (European Communications Satellite) spacecraft to be assumed by Eutelsat after on-orbit testing.[4]
The Eutelsat I series of satellites was developed by theEuropean Space Agency (ESA) as part of the European Communications Satellite (ECS) programme. Once launched and checked out in a geostationary orbit overEurope, each satellite was handed to Eutelsat for commercial operations. Four Eutelsat I satellites were successfully launched between 1983 and 1988 (1983, 1984, 1987, and 1988). They served both public and private traffic, including telephone services, fax, data, land mobile service, and television and radio programming. Each had a design life of 7 years and a bandwidth of 72MHz.[5] ECS-3 was lost in anAriane 3 launch accident in 1985.
The ECS-4 spacecraft, had a mass at launch of 1,185 kg (2,612 lb).[5] Constructed byBritish Aerospace, it was designed to be operated for seven years and carried 12Ku-bandtransponders, two of which were set aside as spares.[4] It also only had partial eclipse protection, requiring some channels to be turned off during eclipse periods around the spring and autumn equinoxes.[1] The satellite contained aMage-2solid rocket motor to perform orbit circularisation atapogee.[4]
ECS-4 was launched byArianespace, using anAriane 3launch vehicle, flight number V19. The launch took place at 00:45:28UTC on 16 September 1987, fromELA-1 atCentre Spatial Guyanais, atKourou,French Guiana.[2] Successfully deployed intogeostationary transfer orbit (GTO), ECS-4 raised itself into an operational geostationary orbit using itsapogee motor.
Following commissioning operations conducted by theEuropean Space Agency (ESA), the Eutelsat I F-4 satellite was moved to its operational orbital position at 10° East, entering service in November 1987. The satellite was decommissioned in November 2002.[6] It is in agraveyard orbit.[1]
This article incorporates text from this source, which is in thepublic domain.