(12439) Okasaki Main-belt Asteroid
Discovered on 15 February 1996 by T. Okuni at Nanyo.
During the past three decades amateur astronomer Kiyomi Okasaki (b. 1950) has discovered two comets and three supernovae at his observatory in Kahoku, Yamagata prefecture.Naming citation (20011101/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Okasaki is today
Seen from above the solar system on 2026-10-14: Okasaki is 3.48 au from the Sun and 2.53 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12439 |
| Provisional designation | 1996 CA3 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 12.86 |
| Orbital period | 5.56 years |
| Semi-major axis | 3.14 au |
| Perihelion – aphelion | 2.72 – 3.56 au |
| Eccentricity | 0.134 |
| Inclination | 2.19° |
| Closest distance between its orbit and Earth's (MOID) | 1.71 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.