(21391) Rotanner Main-belt Asteroid
Discovered on 20 March 1998 by LINEAR at Socorro.
Roberta Tanner (b. 1953), a 2004 Intel International Science and Engineering Fair Excellence in Teaching Award finalist, is a teacher at the Loveland High School, Longmont, Colorado, U.S.A.Naming citation (20041226/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Rotanner is today
Seen from above the solar system on 2026-10-14: Rotanner is 2.37 au from the Sun and 1.38 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21391 |
| Provisional designation | 1998 FY31 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 15.66 |
| Orbital period | 3.34 years |
| Semi-major axis | 2.23 au |
| Perihelion – aphelion | 2.09 – 2.37 au |
| Eccentricity | 0.0635 |
| Inclination | 3.70° |
| Closest distance between its orbit and Earth's (MOID) | 1.09 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Roberta
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- (26499) Robertazabotti
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- (471301) Robertajmolson
All asteroids named after someone called Roberta
Also discovered on 20 March 1998
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