| Name of Satellite, Alternate Names | Sirius 4 (Astra 4A) |
| Country of Operator/Owner | Sweden |
| Operator/Owner | SES Sirius AB |
| Users | Commercial |
| Purpose | Communications |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | 4.85 |
| Perigee (km) | 35776 |
| Apogee (km) | 35795 |
| Eccentricity | 0.000225356121976966 |
| Inclination (degrees) | 0.04 |
| Period (minutes) | 1436.1 |
| Launch Mass (kg.) | 4400 |
| Dry Mass (kg.) | |
| Power (watts) | |
| Date of Launch | 17-11-2007 |
| Expected Lifetime | 15 yrs. |
| Contractor | Lockheed Martin Commercial Space Systems |
| Country of Contractor | USA |
| Launch Site | Baikonur Cosmodrome |
| Launch Vehicle | Proton M |
| COSPAR Number | 2007-057A |
| NORAD Number | 32299 |
| Comments | 52 Ku-band and 2 Ka-band transponders; service to Europe and sub-Saharan Africa. |