| Name of Satellite, Alternate Names | Alphasat I-XL (Inmarsat IV-A F4) |
| Country of Operator/Owner | UK/ESA |
| Operator/Owner | INMARSAT, Ltd./European Space Agency |
| Users | Commercial/Government |
| Purpose | Communications/Technology Development |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | 25 |
| Perigee (km) | 35786 |
| Apogee (km) | 35787 |
| Eccentricity | 1.18605671723222E-05 |
| Inclination (degrees) | 0.02 |
| Period (minutes) | 1436.09 |
| Launch Mass (kg.) | 6650 |
| Dry Mass (kg.) | 3370 |
| Power (watts) | 12000 |
| Date of Launch | 25-07-2013 |
| Expected Lifetime | 15 yrs. |
| Contractor | Astrium |
| Country of Contractor | France/UK/Germany/Spain |
| Launch Site | Guiana Space Center |
| Launch Vehicle | Ariane 5 ECA |
| COSPAR Number | 2013-038A |
| NORAD Number | 39215 |
| Comments | Partnership between INMARSAT and ESA. Expands INMARSAT´s communications and carries 4 technology demonstration packages. |