(8891) Irokawa Main-belt Asteroid
Discovered on 1 September 1994 by Endate, K., Watanabe, K. at Kitami.
Hiroshi Irokawa (b. 1930) was chief editor of Gekkan Tenmon Guide (Monthly Astronomy Guide) from 1972 to 1974. He has also edited many astronomical books.Naming citation (WGSBN Bull. 3, #13, 8), IAU / Minor Planet Center, via NASA/JPL
Where Irokawa is today
Seen from above the solar system on 2026-10-14: Irokawa is 3.47 au from the Sun and 4.13 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8891 |
| Provisional designation | 1994 RC1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 16.2 km (#2,837 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0610 |
| Absolute magnitude (H) | 12.78 |
| Orbital period | 5.59 years |
| Semi-major axis | 3.15 au |
| Perihelion – aphelion | 2.44 – 3.86 au |
| Eccentricity | 0.225 |
| Inclination | 9.39° |
| Closest distance between its orbit and Earth's (MOID) | 1.44 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Hiroshi
- (4965) Takeda
- (5379) Abehiroshi
- (5830) Simohiro
- (6244) Okamoto
- (7250) Kinoshita
- (7254) Kuratani
- (7264) Hirohatanaka
- (8197) Mizunohiroshi
- (8543) Tsunemi
- (8707) Arakihiroshi
- (8923) Yamakawa
- (9226) Arimahiroshi
All asteroids named after someone called Hiroshi