(21631) Stephenhonan Main-belt Asteroid
Discovered on 13 July 1999 by LINEAR at Socorro.
Stephen Goodwin Honan (b. 1989) was awarded first place and Best in Category in the 2005 Intel International Science and Engineering Fair for his environmental sciences project. He attends the W. T. Woodson High School, Fairfax, Virginia, U.S.A.Naming citation (20050822/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Stephenhonan is today
Seen from above the solar system on 2026-10-14: Stephenhonan is 2.73 au from the Sun and 1.86 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21631 |
| Provisional designation | 1999 NU10 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 15.29 |
| Orbital period | 3.74 years |
| Semi-major axis | 2.41 au |
| Perihelion – aphelion | 2.05 – 2.77 au |
| Eccentricity | 0.151 |
| Inclination | 4.85° |
| Closest distance between its orbit and Earth's (MOID) | 1.04 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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