(189261) Hiroo Main-belt Asteroid
Discovered on 11 December 2004 by K. Itagaki at Yamagata.
Hiroo Itagaki (1949-1977) was the discoverer's brother.Naming citation (20111012/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hiroo is today
Seen from above the solar system on 2026-10-14: Hiroo is 3.26 au from the Sun and 3.42 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 189261 |
| Provisional designation | 2004 XO62 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.78 km (#13,269 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.196 |
| Absolute magnitude (H) | 14.47 |
| Orbital period | 5.44 years |
| Semi-major axis | 3.09 au |
| Perihelion – aphelion | 1.96 – 4.23 au |
| Eccentricity | 0.368 |
| Inclination | 16.0° |
| Closest distance between its orbit and Earth's (MOID) | 1.02 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.