| Name of Satellite, Alternate Names | SDS III-4 (Satellite Data System) (NRO L-1, Nemesis, USA 179) |
| Country of Operator/Owner | USA |
| Operator/Owner | National Reconnaissance Office (NRO)/US Air Force |
| Users | Military |
| Purpose | Communications |
| Class of Orbit | Elliptical |
| Type of Orbit | Molniya |
| Longitude of GEO (degrees) | 0 |
| Perigee (km) | 500 |
| Apogee (km) | 39850 |
| Eccentricity | 0.741194198530797 |
| Inclination (degrees) | 63.4 |
| Period (minutes) | 717.7 |
| Launch Mass (kg.) | |
| Dry Mass (kg.) | |
| Power (watts) | |
| Date of Launch | 31-08-2004 |
| Expected Lifetime | 7-10 yrs. |
| Contractor | Hughes |
| Country of Contractor | USA |
| Launch Site | Cape Canaveral |
| Launch Vehicle | Atlas 2AS |
| COSPAR Number | 2004-034A |
| NORAD Number | 28384 |
| Comments | Real-time data relay from reconnaissance satellites. |