| Names | GE-21 Americom-21 |
|---|---|
| Mission type | Communications |
| Operator | SES Americom (2008–2009) SES World Skies (2009–2011) SES (2011-present) |
| COSPAR ID | 2008-038B |
| SATCAT no. | 33275 |
| Mission duration | 15 years (planned) 16 years, 3 months, 10 days (elapsed) |
| Spacecraft properties | |
| Spacecraft | GE-21 |
| Bus | STAR-2[1] |
| Manufacturer | Thales Alenia Space (prime) Orbital Sciences (bus) |
| Launch mass | 2,473 kg (5,452 lb) |
| Dry mass | 1,161 kg (2,560 lb) |
| Power | 4.4 kW |
| Start of mission | |
| Launch date | 14 August 2008, 20:44 UTC |
| Rocket | Ariane 5 ECA |
| Launch site | Centre Spatial Guyanais, ELA-3 |
| Contractor | Arianespace |
| Entered service | September 2008 |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Geostationary orbit |
| Longitude | 125° West [2] |
| Transponders | |
| Band | 24 Ku-band |
| Bandwidth | 36 MHz |
| Coverage area | Canada, United States, Mexico, Caribbean, Central America |
AMC-21, or GE-21, is an American communications satellite operated by SES S.A., formerly SES World Skies and SES Americom. It was launched in August 2008 and is expected to remain in service for approximately 15 years. It is currently located at 125° West longitude.