(21738) Schwank Main-belt Asteroid
Discovered on 9 September 1999 by LINEAR at Socorro.
Benjamin Albert Schwank (b. 1987) was awarded first place and Best in Category in the 2005 Intel International Science and Engineering Fair for his microbiology project. He attends the James Madison High School, Vienna, Virginia, U.S.A.Naming citation (20050822/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Schwank is today
Seen from above the solar system on 2026-10-14: Schwank is 2.39 au from the Sun and 3.37 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21738 |
| Provisional designation | 1999 RB153 |
| Orbit class | Main-belt Asteroid |
| Rotation period | 20.2 hours |
| Absolute magnitude (H) | 15.18 |
| Orbital period | 3.54 years |
| Semi-major axis | 2.32 au |
| Perihelion – aphelion | 1.99 – 2.66 au |
| Eccentricity | 0.145 |
| Inclination | 5.58° |
| Closest distance between its orbit and Earth's (MOID) | 0.981 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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