(10009) Hirosetanso Main-belt Asteroid
Discovered on 12 March 1977 by Kosai, H., Hurukawa, K. at Kiso.
Hirose Tanso (1782-1856) was a Confucian scholar in the Edo period, born at Hita, Oita prefecture.Naming citation (20030106/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hirosetanso is today
Seen from above the solar system on 2026-10-14: Hirosetanso is 2.57 au from the Sun and 2.88 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 10009 |
| Provisional designation | 1977 EA6 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.30 km (#12,044 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.182 |
| Absolute magnitude (H) | 14.26 |
| Orbital period | 3.71 years |
| Semi-major axis | 2.40 au |
| Perihelion – aphelion | 2.15 – 2.65 au |
| Eccentricity | 0.105 |
| Inclination | 4.12° |
| Closest distance between its orbit and Earth's (MOID) | 1.16 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 12 March 1977
- (3319) Kibi
- (4272) Entsuji
- (5454) Kojiki
- (6218) Mizushima
- (12186) Mitukurigen
- (14315) Ogawamachi
- (14316) Higashichichibu
- (14795) Syoyou
- (15202) Yamada-Houkoku
- (15671) Suzannedebarbat
- (15672) Sato-Norio
- (19917) Dazaifu