(8167) Ishii Main-belt Asteroid
Discovered on 14 February 1991 by Endate, K., Watanabe, K. at Kitami.
Named in honor of Takahiro Ishii (b. 1959), Japanese amateur astronomer and active owner of the Kamogawa Observatory, Chiba Prefecture. He is a strong supporter of neighborhood amateurs, and his contribution to popularizing and disseminating celestial photography techniques makes him welcome in gatherings nationwide. Name proposed by the discoverers following a suggestion by Y. Yamada.Naming citation (19990728/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Ishii is today
Seen from above the solar system on 2026-10-14: Ishii is 2.67 au from the Sun and 2.99 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8167 |
| Provisional designation | 1991 CM3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.55 km (#9,641 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.250 |
| Rotation period | 3.18 hours |
| Absolute magnitude (H) | 13.61 |
| Orbital period | 3.79 years |
| Semi-major axis | 2.43 au |
| Perihelion – aphelion | 2.11 – 2.75 au |
| Eccentricity | 0.132 |
| Inclination | 4.56° |
| Closest distance between its orbit and Earth's (MOID) | 1.13 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Takahiro
All asteroids named after someone called Takahiro
Also discovered on 14 February 1991
- (4774) Hobetsu
- (5651) Traversa
- (5878) Charlene
- (6323) Karoji
- (6646) Churanta
- (6723) Chrisclark
- (16525) Shumarinaiko