(21966) Hamadori Main-belt Asteroid
Discovered on 27 November 1999 by LONEOS at Anderson Mesa.
Hamadori is a coastal region in Fukushima prefecture, Japan. The area between Abukuma highland and the Pacific coast was seriously damaged during the 2011 Tohoku earthquake.Naming citation (20120506/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hamadori is today
Seen from above the solar system on 2026-10-14: Hamadori is 2.44 au from the Sun and 2.44 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21966 |
| Provisional designation | 1999 WJ9 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.07 km (#15,052 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.346 |
| Rotation period | 4.01 hours |
| Absolute magnitude (H) | 14.54 |
| Orbital period | 3.75 years |
| Semi-major axis | 2.41 au |
| Perihelion – aphelion | 1.67 – 3.16 au |
| Eccentricity | 0.308 |
| Inclination | 6.60° |
| Closest distance between its orbit and Earth's (MOID) | 0.671 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 27 November 1999
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← (21965) Dones · (21970) Tyle →