(4620) Bickley Main-belt Asteroid
Discovered on 28 July 1978 by Perth Observatory at Bickley.
Named for the present site (since 1966) of the Perth Observatory. In 1915 the locality, in the Darling Range 23 km east-southeast of the center of the city, was officially named for Samuel Wallace Alexander Walsh Bickley (1810-1876), a pioneer in the area who was also a successful merchant and a nominated member of the Legislative Council of the colony (as it was at that time) of Western Australia.Naming citation (19980411/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Bickley is today
Seen from above the solar system on 2026-10-14: Bickley is 2.57 au from the Sun and 3.31 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4620 |
| Provisional designation | 1978 OK |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.82 km (#13,177 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.401 |
| Absolute magnitude (H) | 14.15 |
| Orbital period | 3.48 years |
| Semi-major axis | 2.30 au |
| Perihelion – aphelion | 1.79 – 2.80 au |
| Eccentricity | 0.220 |
| Inclination | 4.50° |
| Closest distance between its orbit and Earth's (MOID) | 0.801 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.