(31087) Oirase Main-belt Asteroid
Discovered on 9 January 1997 by N. Sato at Chichibu.
Oirase is the name of a gorge which runs through Towada, a city in Aomori Prefecture. It is located in the northern region of Honshu, the main island of Japan. It was designated as a “Special Place of Scenic Beauty and Natural Treasure” in 1952 and attracts 2.5 million tourists annually.Naming citation (20111210/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Oirase is today
Seen from above the solar system on 2026-10-14: Oirase is 2.87 au from the Sun and 2.20 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 31087 |
| Provisional designation | 1997 AA22 |
| Orbit class | Main-belt Asteroid |
| Diameter | 6.28 km (#8,543 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.148 |
| Rotation period | 22.5 hours |
| Absolute magnitude (H) | 14.02 |
| Orbital period | 5.22 years |
| Semi-major axis | 3.01 au |
| Perihelion – aphelion | 2.70 – 3.33 au |
| Eccentricity | 0.105 |
| Inclination | 10.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.72 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 9 January 1997
- (8736) Shigehisa
- (9108) Toruyusa
- (9109) Yukomotizuki
- (12028) Annekinney
- (12469) Katsuura
- (18550) Maoyisheng
- (29420) Ikuo
- (39741) Komm