Eutelsat I F-3 Explained

Eutelsat I F-3
Names List:ECS-3
European Communications Satellite-3
Eutelsat 3
Mission Type:Communications
Operator:ESA / Eutelsat
Website:https://www.eutelsat.com/en/home.html
Mission Duration:7 years (planned)
Failed to orbit
Spacecraft:ECS-3
Spacecraft Type:ECS
Spacecraft Bus:ECS-Bus
Manufacturer:British Aerospace
Dimensions:1.9 m x 1.4 m x 2.3 m
Span on orbit: 13.8 m
Power:1 kW
Launch Date:12 September 1985,
23:26:00 UTC
Launch Rocket:Ariane 3 (V15)
Launch Site:Centre Spatial Guyanais, ELA-1
Launch Contractor:Arianespace
Entered Service:Failed to orbit
Orbit Reference:Geocentric orbit (planned)
Orbit Regime:Geostationary orbit
Orbit Longitude:10° East
Apsis:gee
Trans Band:12 Ku-band
Trans Bandwidth:72 MHz
Trans Coverage:Europe, the Middle East and Africa
Programme:Eutelsat constellation
Previous Mission:Eutelsat I F-2
Next Mission:Eutelsat I F-4

Eutelsat I F-3, also known as European Communications Satellite 3 (ECS-3) is a decommissioned communications satellite operated by the European Telecommunications Satellite Organisation (Eutelsat). Launched in 1985, it was operated in geostationary orbit at a longitude of 10° East. It was the third of five satellites launched to form the first-generation Eutelsat constellation.

History

The European Telecommunications Satellite Organization (Eutelsat) has been servicing the European 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.

The Eutelsat I series of satellites was developed by the European Space Agency (ESA) as part of the European Communications Satellite (ECS) programme. Once launched and checked out in a geostationary orbit over Europe, 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 72 MHz.[1] ECS-3 was lost in an Ariane 3 launch accident in 1985.

Satellite description

The ECS-3 spacecraft, had a mass at launch of .[1] Constructed by British Aerospace, it was designed to be operated for seven years and carried 12 Ku-band transponders, two of which were set aside as spares.[2] It also only had partial eclipse protection, requiring some channels to be turned off during eclipse periods around the spring and autumn equinoxes.[3] The satellite contained a Mage-2 solid rocket motor to perform orbit circularisation at apogee.[2]

Launch

ECS-3 was launched by Arianespace, using an Ariane 3 launch vehicle, flight number V15. The launch took place at 23:26:00 UTC on 12 September 1985, from ELA-1 at Centre Spatial Guyanais, at Kourou, French Guiana.[4] Successfully deployed into geostationary transfer orbit (GTO), ECS-2 raised itself into an operational geostationary orbit using its apogee motor.

Notes and References

  1. Web site: Display: EUTELSAT 1 1983-058A. NASA. 13 April 2021. 20 April 2021.
  2. Web site: ECS 1, 2, 3, 4, 5 (Eutelsat-1 F1, 2, 4, 5). Gunter. Krebs. Gunter's Space Page. 21 July 2019. 20 April 2021.
  3. Encyclopedia: Eutelsat I F2. Tag Broadcasting Services. The Satellite Encyclopedia. 20 April 2021. https://web.archive.org/web/20160304113125/http://www.tbs-satellite.com/tse/online/sat_eutelsat_1f2.html. 4 March 2016.
  4. Web site: Launch Log. Jonathan's Space Report. 14 March 2021. 20 April 2021.