| Name of Satellite, Alternate Names | AcrimSat (Active Cavity Radiometer Irradiance Monitor) |
| Country of Operator/Owner | USA |
| Operator/Owner | NASA Goddard Space Flight Center, Jet Propulsion Laboratory |
| Users | Government |
| Purpose | Solar Physics |
| Class of Orbit | LEO |
| Type of Orbit | Sun-Synchronous |
| Longitude of GEO (degrees) | 0 |
| Perigee (km) | 670 |
| Apogee (km) | 710 |
| Eccentricity | 0.0028328611898017 |
| Inclination (degrees) | 97.8 |
| Period (minutes) | 98.6 |
| Launch Mass (kg.) | 115 |
| Dry Mass (kg.) | 13 |
| Power (watts) | 10 |
| Date of Launch | 21-12-1999 |
| Expected Lifetime | 5 yrs. |
| Contractor | Orbital Sciences Corp. |
| Country of Contractor | USA |
| Launch Site | Vandenberg AFB |
| Launch Vehicle | Taurus |
| COSPAR Number | 1999-070B |
| NORAD Number | 26033 |
| Comments | Monitor total solar irradiance (TSI) with maximum precision; ascertain the extent of solar radiation variability. |