(4871) Riverside Main-belt Asteroid
Discovered on 24 November 1989 by M. Koishikawa at Ayashi.
Where Riverside is today
Seen from above the solar system on 2026-10-14: Riverside is 2.06 au from the Sun and 1.12 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4871 |
| Provisional designation | 1989 WH1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.08 km (#10,461 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.327 |
| Rotation period | 6.05 hours |
| Absolute magnitude (H) | 13.62 |
| Orbital period | 3.39 years |
| Semi-major axis | 2.26 au |
| Perihelion – aphelion | 2.01 – 2.50 au |
| Eccentricity | 0.108 |
| Inclination | 2.90° |
| Closest distance between its orbit and Earth's (MOID) | 1.02 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.