| Name of Satellite, Alternate Names | AMC-21 (Americom 21) |
| Country of Operator/Owner | USA |
| Operator/Owner | SES (Société Européenne des Satellites (SES)) |
| Users | Commercial |
| Purpose | Communications |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | -124.86 |
| Perigee (km) | 35778 |
| Apogee (km) | 35793 |
| Eccentricity | 0.000177912727876552 |
| Inclination (degrees) | 3 |
| Period (minutes) | 1436.1 |
| Launch Mass (kg.) | 2500 |
| Dry Mass (kg.) | |
| Power (watts) | 5000 |
| Date of Launch | 14-08-2008 |
| Expected Lifetime | 15 yrs. |
| Contractor | Orbital Sciences Corp. |
| Country of Contractor | USA |
| Launch Site | Guiana Space Center |
| Launch Vehicle | Ariane 5 ECA |
| COSPAR Number | 2008-038B |
| NORAD Number | 33275 |
| Comments | Television services to the US, Canada, Mexico and Caribbean. |