(9100) Tomohisa Main-belt Asteroid
Discovered on 2 December 1996 by T. Kobayashi at Oizumi.
Japanese amateur astronomer Tomohisa Ohno (b. 1948) became interested in astronomy at age 12. He has been very enthusiastic in sharing the beauty and wonders of the cosmos. He recently rehabilitated the late Minoru Honda's observatory, “Seijin-Sanso”, and is operating it.Naming citation (20030806/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Tomohisa is today
Seen from above the solar system on 2026-10-14: Tomohisa is 2.57 au from the Sun and 2.25 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9100 |
| Provisional designation | 1996 XU1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.52 km (#9,679 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.277 |
| Rotation period | 5.43 hours |
| Absolute magnitude (H) | 13.62 |
| Orbital period | 3.75 years |
| Semi-major axis | 2.41 au |
| Perihelion – aphelion | 2.02 – 2.81 au |
| Eccentricity | 0.163 |
| Inclination | 7.94° |
| Closest distance between its orbit and Earth's (MOID) | 1.03 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.