(8923) Yamakawa Main-belt Asteroid
Discovered on 30 November 1996 by T. Kobayashi at Oizumi.
Hiroshi Yamakawa (b. 1965) is an interplanetary trajectory and mission designer at ISAS. He worked for the MUSES-C mission, mainly in its early phase. He is now the study manager of the MMO Mercury orbiter, planned as one of the spacecraft for the ESA-ISAS international Mercury mission BepiColombo.Naming citation (20030501/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Yamakawa is today
Seen from above the solar system on 2026-10-14: Yamakawa is 2.62 au from the Sun and 1.77 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8923 |
| Provisional designation | 1996 WQ1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.12 km (#14,922 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.380 |
| Absolute magnitude (H) | 14.41 |
| Orbital period | 3.76 years |
| Semi-major axis | 2.42 au |
| Perihelion – aphelion | 2.07 – 2.77 au |
| Eccentricity | 0.145 |
| Inclination | 1.56° |
| Closest distance between its orbit and Earth's (MOID) | 1.07 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
- (8891) Irokawa
- (9226) Arimahiroshi
All asteroids named after someone called Hiroshi