(21639) Davidkaufman Main-belt Asteroid
Discovered on 14 July 1999 by LINEAR at Socorro.
David Brooks Kaufman (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for his botany team project. He attends the Keystone School, San Antonio, Texas, U.S.A.Naming citation (20050822/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Davidkaufman is today
Seen from above the solar system on 2026-10-14: Davidkaufman is 2.50 au from the Sun and 2.65 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21639 |
| Provisional designation | 1999 ND39 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.83 km (#9,185 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.143 |
| Rotation period | 4.41 hours |
| Absolute magnitude (H) | 14.2 |
| Orbital period | 3.42 years |
| Semi-major axis | 2.27 au |
| Perihelion – aphelion | 2.01 – 2.54 au |
| Eccentricity | 0.117 |
| Inclination | 5.83° |
| Closest distance between its orbit and Earth's (MOID) | 1.02 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called David
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All asteroids named after someone called David
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