| Name of Satellite, Alternate Names | INMARSAT 3 F5 |
| 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) | 25.07 |
| Perigee (km) | 35769 |
| Apogee (km) | 35803 |
| Eccentricity | 0.000403264066799507 |
| Inclination (degrees) | 0.04 |
| Period (minutes) | 1436.07 |
| Launch Mass (kg.) | 2000 |
| Dry Mass (kg.) | 895 |
| Power (watts) | 2800 |
| Date of Launch | 04-02-1998 |
| Expected Lifetime | 13 yrs. |
| Contractor | Lockheed Martin Commercial Space Systems |
| Country of Contractor | USA |
| Launch Site | Guiana Space Center |
| Launch Vehicle | Ariane 44L |
| COSPAR Number | 1998-006B |
| NORAD Number | 25153 |
| Comments | Broadcasting, business services, mobile communications; demand assigned L-band transponders; back-up and leased-capacity. |