| Eutelsat 139 West A | |
| Names List: | Eutelsat 12 West D Eutelsat 31B Eutelsat W3A (2004-2012) Eutelsat 7A (2012-2021) |
| Mission Type: | Communications |
| Operator: | Eutelsat S.A. |
| Cospar Id: | 2004-008A |
| Satcat: | 28187 |
| Mission Duration: | 15 years (planned) |
| Spacecraft: | EUTELSAT W3A |
| Spacecraft Type: | Eurostar |
| Spacecraft Bus: | Eurostar-3000S |
| Manufacturer: | EADS Astrium |
| Power: | 9.6 kW |
| Launch Date: | 15 March 2004, 23:06:00 UTC[1] |
| Launch Rocket: | Proton-M / Briz-M |
| Launch Site: | Baikonur Cosmodrome, Site 81/24 |
| Launch Contractor: | Khrunichev State Research and Production Space Center |
| Entered Service: | 15 May 2004 |
| Orbit Reference: | Geocentric orbit[2] |
| Orbit Regime: | Geostationary orbit |
| Orbit Longitude: | 139° West |
| Apsis: | gee |
| Trans Band: | 40 transponders: 38 Ku-band 2 Ka-band |
| Trans Coverage: | Americas |
| Programme: | Eutelsat constellation |
| Previous Mission: | Eutelsat W5 |
| Next Mission: | Eutelsat W2M |
Eutelsat 139 West A is a communications satellite owned by Eutelsat S.A. Formerly placed at 7° East, it is currently placed at 139° West and broadcasts TV channels, radios and other digital data. It entered operational service on 15 May 2004.
Built by EADS Astrium on a Eurostar-3000S satellite bus, it is equipped with 42 Ku-band transponders broadcasting in the Americas (formerly Europe, North Africa, the Middle East and sub-Saharan Africa) and 2 Ka-band transponders.
It was launched on 15 March 2004 at 23:06:00 UTC by Proton-M / Briz-M from the Baikonur Cosmodrome. It had a launch mass of . Its estimated lifespan is 15 years.
It is equipped with Skyplex technique for multiplexing on board. It is the first geostationary satellite to use a lithium-ion battery.
It was used by the European Broadcasting Union's Eurovision network. It also broadcast the Turkish Digiturk offerings until early 2020 and numerous Internet connection services such as OpenSky, Hughes Europe or Skylogic.
In December 2011, Eutelsat announced, that their satellite assets will be renamed under a unified brand name effective from March 2012. This satellite became Eutelsat 7A.