| Name of Satellite, Alternate Names | INMARSAT 4 F1 |
| Country of Operator/Owner | United Kingdom |
| Operator/Owner | INMARSAT, Ltd. |
| Users | Commercial |
| Purpose | Communications |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | 63.96 |
| Perigee (km) | 35772 |
| Apogee (km) | 35799 |
| Eccentricity | 0.000320242910177794 |
| Inclination (degrees) | 2.3 |
| Period (minutes) | 1436.08 |
| Launch Mass (kg.) | 5959 |
| Dry Mass (kg.) | |
| Power (watts) | 13000 |
| Date of Launch | 11-03-2005 |
| Expected Lifetime | 15 yrs. |
| Contractor | EADS Astrium |
| Country of Contractor | France/UK/Germany |
| Launch Site | Cape Canaveral |
| Launch Vehicle | Atlas 5 |
| COSPAR Number | 2005-009A |
| NORAD Number | 28628 |
| Comments | Nearly the size of a double-decker bus; more than 600 channels. |