(4289) Biwako Main-belt Asteroid
Discovered on 29 October 1989 by A. Sugie at Dynic.
Where Biwako is today
Seen from above the solar system on 2026-10-14: Biwako is 2.61 au from the Sun and 3.21 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4289 |
| Provisional designation | 1989 UA2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.69 km (#6,882 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.248 |
| Rotation period | 4.42 hours |
| Absolute magnitude (H) | 13.17 |
| Orbital period | 3.48 years |
| Semi-major axis | 2.30 au |
| Perihelion – aphelion | 1.94 – 2.66 au |
| Eccentricity | 0.156 |
| Inclination | 5.46° |
| Closest distance between its orbit and Earth's (MOID) | 0.950 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.