(22815) Sewell Main-belt Asteroid
Discovered on 7 September 1999 by LINEAR at Socorro.
Michael T. Sewell (b. 1993) is a finalist in the 2006 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his physical science project. He attends the Everest Academy, Clarkston, Michigan.Naming citation (20061009/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Sewell is today
Seen from above the solar system on 2026-10-14: Sewell is 2.68 au from the Sun and 3.66 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 22815 |
| Provisional designation | 1999 RN18 |
| Orbit class | Main-belt Asteroid |
| Diameter | 1.77 km (#17,241 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.566 |
| Absolute magnitude (H) | 15.32 |
| Orbital period | 3.58 years |
| Semi-major axis | 2.34 au |
| Perihelion – aphelion | 1.97 – 2.71 au |
| Eccentricity | 0.157 |
| Inclination | 6.23° |
| Closest distance between its orbit and Earth's (MOID) | 0.967 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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