(21670) Kuan Main-belt Asteroid
Discovered on 7 September 1999 by LINEAR at Socorro.
Aaron Tzeyang Kuan (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for his environmental sciences project. He attends the Horace Greeley High School, Chappaqua, New York, U.S.A.Naming citation (20050822/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Kuan is today
Seen from above the solar system on 2026-10-14: Kuan is 2.14 au from the Sun and 2.25 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21670 |
| Provisional designation | 1999 RD11 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 15.24 |
| Orbital period | 3.42 years |
| Semi-major axis | 2.27 au |
| Perihelion – aphelion | 1.99 – 2.56 au |
| Eccentricity | 0.126 |
| Inclination | 2.56° |
| Closest distance between its orbit and Earth's (MOID) | 0.984 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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