(228136) Billary Main-belt Asteroid
Discovered on 13 September 2009 by Busch, M., Kresken, R. at ESA OGS.
William Griffith (b. 1956) and Hillary U. Galkin (b. 1956), avid amateur astronomers from southern California, are supporters of the Starkenburg-Sternwarte in Heppenheim, Germany.Naming citation (20100330/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Billary is today
Seen from above the solar system on 2026-10-14: Billary is 2.08 au from the Sun and 1.11 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 228136 |
| Provisional designation | 2009 RF4 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 17.28 |
| Orbital period | 3.39 years |
| Semi-major axis | 2.26 au |
| Perihelion – aphelion | 2.02 – 2.49 au |
| Eccentricity | 0.105 |
| Inclination | 3.28° |
| Closest distance between its orbit and Earth's (MOID) | 1.01 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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