(18365) Shimomoto Main-belt Asteroid
Discovered on 17 November 1990 by T. Seki at Geisei.
Shigeo Shimomoto (b. 1963) is a Japanese amateur astronomer and computer programmer. He is the administrator of Comet hunter Seki's webpage. He actively observes comets in Tosa, Kochi prefecture, and encourages the public to learn more about astronomy through his own website.Naming citation (WGSBN Bull. 2, #16, 4), IAU / Minor Planet Center, via NASA/JPL
Where Shimomoto is today
Seen from above the solar system on 2026-10-14: Shimomoto is 3.09 au from the Sun and 2.23 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 18365 |
| Provisional designation | 1990 WN5 |
| Orbit class | Main-belt Asteroid |
| Diameter | 15.4 km (#3,044 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.125 |
| Absolute magnitude (H) | 12.07 |
| Orbital period | 5.23 years |
| Semi-major axis | 3.01 au |
| Perihelion – aphelion | 2.88 – 3.15 au |
| Eccentricity | 0.0457 |
| Inclination | 11.2° |
| Closest distance between its orbit and Earth's (MOID) | 1.87 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Shigeo
All asteroids named after someone called Shigeo