| Name of Satellite, Alternate Names | Akebono (EXOS-D) |
| Country of Operator/Owner | Japan |
| Operator/Owner | Institute of Space and Aeronautical Science, University of Tokyo |
| Users | Civil |
| Purpose | Space Physics |
| Class of Orbit | Elliptical |
| Type of Orbit | |
| Longitude of GEO (degrees) | 0 |
| Perigee (km) | 264 |
| Apogee (km) | 5732 |
| Eccentricity | 0.291844577284372 |
| Inclination (degrees) | 75.1 |
| Period (minutes) | 150.4 |
| Launch Mass (kg.) | |
| Dry Mass (kg.) | 294 |
| Power (watts) | 270 (EOL) |
| Date of Launch | 21-02-1989 |
| Expected Lifetime | 1 yr. |
| Contractor | Institute of Space and Aeronautical Science, University of Tokyo |
| Country of Contractor | Japan |
| Launch Site | Uchinoura Space Center |
| Launch Vehicle | Mu 3S2 |
| COSPAR Number | 1989-016A |
| NORAD Number | 19822 |
| Comments | Investigate particle acceleration regions above auroral region; develop better understanding of acceleration mechanism and relation to substorm phenomena. |