(21410) Cahill Main-belt Asteroid
Discovered on 20 March 1998 by LINEAR at Socorro.
James Andrew Cahill (b. 1987) is a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors, for his earth and planetary science project. He attends the Flagstaff High School, Flagstaff, Arizona.Naming citation (20050224/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Cahill is today
Seen from above the solar system on 2026-10-14: Cahill is 2.08 au from the Sun and 1.77 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21410 |
| Provisional designation | 1998 FH65 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.72 km (#11,172 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0790 |
| Absolute magnitude (H) | 15.12 |
| Orbital period | 3.44 years |
| Semi-major axis | 2.28 au |
| Perihelion – aphelion | 1.98 – 2.58 au |
| Eccentricity | 0.131 |
| Inclination | 1.75° |
| Closest distance between its orbit and Earth's (MOID) | 0.966 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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