| Name of Satellite, Alternate Names | DSP 20 (USA 149) (Defense Support Program) |
| Country of Operator/Owner | USA |
| Operator/Owner | Air Force |
| Users | Military |
| Purpose | Early Warning |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | -36.25 |
| Perigee (km) | 35897 |
| Apogee (km) | 35909 |
| Eccentricity | 0.000141934568164076 |
| Inclination (degrees) | 4.08 |
| Period (minutes) | 142.08 |
| Launch Mass (kg.) | 2380 |
| Dry Mass (kg.) | |
| Power (watts) | 1485 |
| Date of Launch | 18-05-2000 |
| Expected Lifetime | 7-9 yrs. |
| Contractor | TRW and Aerojet Electronics Systems |
| Country of Contractor | USA |
| Launch Site | Cape Canaveral |
| Launch Vehicle | Titan IVB |
| COSPAR Number | 2000-024A |
| NORAD Number | 26356 |
| Comments | Infrared sensors to detect heat from missile and booster plumes against Earth´s background; detection capability of smaller missiles; improved warning of attack by short-range missiles against U.S. and allied forces. |