Norad ID: 41896
| Spacetrack Directory Name | ARASE (ERG) |
| Follow ARASE (ERG) | ARASE (ERG) Tracker |
| Pass predictions ARASE (ERG) | Pass predictions ARASE (ERG) |
| Orbit launches |
|
| Days in orbit | 3409 |
| Country/organisation of origin | Japonia (JPN) |
| Starting point | KSCUT (Uchinoura Space Center, Japan) |
| Categories | |
| Perigee | 406 km |
| Apogee | 32234 km |
| Orbit slope (inclination) | 31.89° |
| Laps per day | 3 |
| Orbit | Elliptical |
| Height ARASE (ERG) | 21604.01 km |
Arase, formerly known as Exploration of energization and Radiation in Geospace (ERG), is a scientific satellite to study the Van Allen belts. It was developed by the Institute of Space and Astronautical Science of JAXA. While there was a scientist working on a similar project with the surname Arase, the satellite's name has nothing to do with him but instead named after a river beside the launch point.
It was launched aboard Epsilon launch vehicle at 11:00:00, 20 December 2016 UTC into apogee height 32250 km, perigee 214 km orbit. Subsequent perigee-up operation moved its orbit to apogee 32110 km, perigee 460 km of 565 minutes period.