(10064) Hirosetamotsu Main-belt Asteroid
Discovered on 31 October 1988 by T. Kojima at Chiyoda.
Tamotsu Hirose (b. 1931) is known as an astronomical leader throughout the four prefectures of the island of Shikoku. He began observing sunspots with a heliostat in 1949, after which he built his own private observatory for the continuous observation of sunspots, a major contribution to astronomy.Naming citation (20100330/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hirosetamotsu is today
Seen from above the solar system on 2026-10-14: Hirosetamotsu is 3.23 au from the Sun and 4.13 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 10064 |
| Provisional designation | 1988 UO |
| Orbit class | Main-belt Asteroid |
| Diameter | 9.62 km (#5,329 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.244 |
| Rotation period | 8.05 hours |
| Absolute magnitude (H) | 12.31 |
| Orbital period | 4.51 years |
| Semi-major axis | 2.73 au |
| Perihelion – aphelion | 2.22 – 3.24 au |
| Eccentricity | 0.187 |
| Inclination | 9.72° |
| Closest distance between its orbit and Earth's (MOID) | 1.23 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.