(21609) Williamcaleb Main-belt Asteroid
Discovered on 10 May 1999 by LINEAR at Socorro.
William Caleb Rodgers (b. 1987) was awarded second place in the 2006 Intel International Science and Engineering Fair for his engineering team project. He attends the Paulding County High School, Dallas, Georgia, U.S.A.Naming citation (20060711/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Williamcaleb is today
Seen from above the solar system on 2026-10-14: Williamcaleb is 1.83 au from the Sun and 1.81 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21609 |
| Provisional designation | 1999 JQ41 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.37 km (#11,899 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.336 |
| Rotation period | 112 hours |
| Absolute magnitude (H) | 14.08 |
| Orbital period | 3.60 years |
| Semi-major axis | 2.35 au |
| Perihelion – aphelion | 1.80 – 2.90 au |
| Eccentricity | 0.235 |
| Inclination | 6.46° |
| Closest distance between its orbit and Earth's (MOID) | 0.818 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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