(18400) Muramatsushigeru Main-belt Asteroid
Discovered on 25 November 1992 by T. Seki at Geisei.
Shigeru Muramatsu (b. 1951) is a Japanese amateur astronomer living in Imabari City, Ehime Prefecture. He dedicates his time to outreach programs, holding public talks and observing sessions.Naming citation (WGSBN Bull. 2, #2, 6), IAU / Minor Planet Center, via NASA/JPL
Where Muramatsushigeru is today
Seen from above the solar system on 2026-10-14: Muramatsushigeru is 2.82 au from the Sun and 3.38 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 18400 |
| Provisional designation | 1992 WY3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.35 km (#11,947 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.257 |
| Absolute magnitude (H) | 14.23 |
| Orbital period | 4.12 years |
| Semi-major axis | 2.57 au |
| Perihelion – aphelion | 2.32 – 2.82 au |
| Eccentricity | 0.0970 |
| Inclination | 10.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.32 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Shigeru
All asteroids named after someone called Shigeru