(21015) Shigenari Main-belt Asteroid
Discovered on 16 October 1988 by Fujii, T., Watanabe, K. at Kitami.
Shigenari Oonishi (b. 1946) is a famous illustrator, who has designed many record covers. He opened his private art museum, Shigechan Land, in his hometown (Tsubetsu town, Hokkaido, Japan) in 2001.Naming citation (MPC batch dated 2017-10-05), IAU / Minor Planet Center, via NASA/JPL
Where Shigenari is today
Seen from above the solar system on 2026-10-14: Shigenari is 3.14 au from the Sun and 3.19 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21015 |
| Provisional designation | 1988 UF |
| Orbit class | Main-belt Asteroid |
| Diameter | 9.14 km (#5,658 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.160 |
| Absolute magnitude (H) | 13.19 |
| Orbital period | 5.29 years |
| Semi-major axis | 3.03 au |
| Perihelion – aphelion | 2.70 – 3.37 au |
| Eccentricity | 0.110 |
| Inclination | 11.0° |
| Closest distance between its orbit and Earth's (MOID) | 1.70 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.