(20553) Donaldhowk Main-belt Asteroid
Discovered on 9 September 1999 by LINEAR at Socorro.
Donald Howk mentored a finalist in the 2004 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. He teaches at the Keystone Junior High School, San Antonio, Texas.Naming citation (20041028/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Donaldhowk is today
Seen from above the solar system on 2026-10-14: Donaldhowk is 2.08 au from the Sun and 2.89 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20553 |
| Provisional designation | 1999 RQ113 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.21 km (#14,684 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.171 |
| Rotation period | 5.25 hours |
| Absolute magnitude (H) | 14.9 |
| Orbital period | 3.49 years |
| Semi-major axis | 2.30 au |
| Perihelion – aphelion | 2.06 – 2.55 au |
| Eccentricity | 0.106 |
| Inclination | 2.79° |
| Closest distance between its orbit and Earth's (MOID) | 1.05 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Donald
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All asteroids named after someone called Donald
Also discovered on 9 September 1999
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