(5830) Simohiro Main-belt Asteroid
Discovered on 9 March 1991 by Niijima, T., Urata, T. at Ojima.
Hiroshi Shimoda (b. 1949) is a Japanese amateur astronomer and specialist in agricultural management in Gunma prefecture. He is a devoted observer of small bodies in the solar system. As an early member of the astronomical society Ota-Uchuno-Kai he encouraged many amateur astronomers.Naming citation (20050523/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Simohiro is today
Seen from above the solar system on 2026-10-14: Simohiro is 2.72 au from the Sun and 2.76 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5830 |
| Provisional designation | 1991 EG |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.02 km (#15,160 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.336 |
| Rotation period | 58.1 hours |
| Absolute magnitude (H) | 15.05 |
| Orbital period | 3.43 years |
| Semi-major axis | 2.27 au |
| Perihelion – aphelion | 1.81 – 2.74 au |
| Eccentricity | 0.203 |
| Inclination | 5.26° |
| Closest distance between its orbit and Earth's (MOID) | 0.835 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Hiroshi
- (4965) Takeda
- (5379) Abehiroshi
- (6244) Okamoto
- (7250) Kinoshita
- (7254) Kuratani
- (7264) Hirohatanaka
- (8197) Mizunohiroshi
- (8543) Tsunemi
- (8707) Arakihiroshi
- (8891) Irokawa
- (8923) Yamakawa
- (9226) Arimahiroshi
All asteroids named after someone called Hiroshi