| Name of Satellite, Alternate Names | Skynet 4E |
| Country of Operator/Owner | United Kingdom |
| Operator/Owner | Ministry of Defence |
| Users | Military |
| Purpose | Communications |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | 35.58 |
| Perigee (km) | 35774 |
| Apogee (km) | 35797 |
| Eccentricity | 0.00027279951607738 |
| Inclination (degrees) | 4.99 |
| Period (minutes) | 1436.06 |
| Launch Mass (kg.) | 1510 |
| Dry Mass (kg.) | 759 |
| Power (watts) | 1200 |
| Date of Launch | 26-02-1999 |
| Expected Lifetime | 7 yrs. |
| Contractor | Astrium |
| Country of Contractor | France/UK/Germany |
| Launch Site | Guiana Space Center |
| Launch Vehicle | Ariane 44L |
| COSPAR Number | 1999-009B |
| NORAD Number | 25639 |
| Comments | Used primarily by UK´s armed forces, government departments, agencies and other organizations that require secure communications. |