(21188) Kiyohiro Main-belt Asteroid
Discovered on 5 April 1994 by Endate, K., Watanabe, K. at Kitami.
Kiyohiro Kozai (b. 1964) is well known as an enthusiastic amateur astronomer in Kagawa Prefecture. He is a popular lecturer to the families that come to hear him at the astronomical classrooms of his local community center.Naming citation (MPC batch dated 2018-05-29), IAU / Minor Planet Center, via NASA/JPL
Where Kiyohiro is today
Seen from above the solar system on 2026-10-14: Kiyohiro is 2.43 au from the Sun and 1.56 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21188 |
| Provisional designation | 1994 GN |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.85 km (#13,112 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.157 |
| Absolute magnitude (H) | 14.15 |
| Orbital period | 3.42 years |
| Semi-major axis | 2.27 au |
| Perihelion – aphelion | 1.95 – 2.59 au |
| Eccentricity | 0.141 |
| Inclination | 5.55° |
| Closest distance between its orbit and Earth's (MOID) | 0.934 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.