| Name of Satellite, Alternate Names | INMARSAT 4 F3 |
| 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) | -97.65 |
| Perigee (km) | 35775 |
| Apogee (km) | 35798 |
| Eccentricity | 0.00027279304496341 |
| Inclination (degrees) | 3.01 |
| Period (minutes) | 1436.1 |
| Launch Mass (kg.) | 5960 |
| Dry Mass (kg.) | |
| Power (watts) | 13000 |
| Date of Launch | 18-08-2008 |
| Expected Lifetime | 15 yrs. |
| Contractor | EADS Astrium |
| Country of Contractor | France/UK/Germany |
| Launch Site | Baikonur Cosmodrome |
| Launch Vehicle | Proton M |
| COSPAR Number | 2008-039A |
| NORAD Number | 33278 |
| Comments | 200 spot-beams to relay messages from mobile phones based on land, sea, or air. |