(4425) Bilk Main-belt Asteroid
Discovered on 30 October 1967 by L. Kohoutek at Bergedorf.
Bilk is the district in the city of Düsseldorf where in 1843 Johann Benzenberg established a private observatory that he bequeathed to the city. C. Robert Luther discovered 24 minor planets from the observatory at Bilk during 1852-1890. The observatory was destroyed in 1943.Naming citation (20070730/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Bilk is today
Seen from above the solar system on 2026-10-14: Bilk is 2.20 au from the Sun and 3.20 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4425 |
| Provisional designation | 1967 UQ |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.28 km (#10,085 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.191 |
| Rotation period | 5.25 hours |
| Absolute magnitude (H) | 14.23 |
| Orbital period | 3.62 years |
| Semi-major axis | 2.36 au |
| Perihelion – aphelion | 1.97 – 2.75 au |
| Eccentricity | 0.164 |
| Inclination | 3.31° |
| Closest distance between its orbit and Earth's (MOID) | 0.991 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.