(21706) Robminehart Outer Main-belt Asteroid
Discovered on 7 September 1999 by LINEAR at Socorro.
Robert Francis Minehart, III (b. 1988) was awarded second place in the 2005 Intel International Science and Engineering Fair for his engineering project. He attends the Dominion High School, Sterling, Virginia, U.S.A.Naming citation (20050822/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Robminehart is today
Seen from above the solar system on 2026-10-14: Robminehart is 3.59 au from the Sun and 3.88 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21706 |
| Provisional designation | 1999 RM87 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 9.48 km (#5,432 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0450 |
| Rotation period | 53.2 hours |
| Absolute magnitude (H) | 14.04 |
| Orbital period | 5.73 years |
| Semi-major axis | 3.20 au |
| Perihelion – aphelion | 2.81 – 3.59 au |
| Eccentricity | 0.122 |
| Inclination | 0.273° |
| Closest distance between its orbit and Earth's (MOID) | 1.83 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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