(4971) Hoshinohiroba Main-belt Asteroid
Discovered on 30 January 1989 by Fujii, T., Watanabe, K. at Kitami.
Where Hoshinohiroba is today
Seen from above the solar system on 2026-10-14: Hoshinohiroba is 2.61 au from the Sun and 3.57 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4971 |
| Provisional designation | 1989 BY |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.65 km (#11,329 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.515 |
| Rotation period | 10.1 hours |
| Absolute magnitude (H) | 13.42 |
| Orbital period | 3.68 years |
| Semi-major axis | 2.38 au |
| Perihelion – aphelion | 1.96 – 2.81 au |
| Eccentricity | 0.177 |
| Inclination | 3.20° |
| Closest distance between its orbit and Earth's (MOID) | 0.978 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.