(48433) Onishi Main-belt Asteroid
Discovered on 29 October 1989 by Takahashi, A., Watanabe, K. at Kitami.
Toshikazu Onishi (b. 1968) is a Japanese astronomer who is a professor of radio astronomy at Osaka Metropolitan University. Using the NANTEN/NANTEN2 radio telescopes, and ALMA, he has studied the structure and evolution of molecular clouds and the star-formation process in the Milky Way and nearby galaxies.Naming citation (WGSBN Bull. 6, #9, 15), IAU / Minor Planet Center, via NASA/JPL
Where Onishi is today
Seen from above the solar system on 2026-10-14: Onishi is 3.01 au from the Sun and 3.87 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 48433 |
| Provisional designation | 1989 US1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 12.7 km (#3,841 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0400 |
| Absolute magnitude (H) | 13.71 |
| Orbital period | 4.28 years |
| Semi-major axis | 2.64 au |
| Perihelion – aphelion | 2.01 – 3.26 au |
| Eccentricity | 0.236 |
| Inclination | 13.9° |
| Closest distance between its orbit and Earth's (MOID) | 1.02 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Toshikazu
All asteroids named after someone called Toshikazu