(21237) Suematsu Main-belt Asteroid
Discovered on 18 November 1995 by Endate, K., Watanabe, K. at Kitami.
Kenji Suematsu (b. 1966) teaches physics and earth sciences as a high school teacher in Nagasaki Prefecture. He is an enthusiastic teacher for students of all grades, from elementary through high school, and shows a particular passion for lectures on astronomy.Naming citation (MPC batch dated 2018-10-26), IAU / Minor Planet Center, via NASA/JPL
Where Suematsu is today
Seen from above the solar system on 2026-10-14: Suematsu is 2.40 au from the Sun and 3.00 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21237 |
| Provisional designation | 1995 WF5 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.80 km (#11,008 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.278 |
| Absolute magnitude (H) | 14.13 |
| Orbital period | 4.30 years |
| Semi-major axis | 2.65 au |
| Perihelion – aphelion | 2.24 – 3.05 au |
| Eccentricity | 0.154 |
| Inclination | 4.39° |
| Closest distance between its orbit and Earth's (MOID) | 1.26 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Kenji
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- (9416) Miyahara
- (10601) Hiwatashi
- (22395) Ourakenji
- (24962) Kenjitoba
- (117582) Kenjikawai
All asteroids named after someone called Kenji