(21671) Warrener Main-belt Asteroid
Discovered on 7 September 1999 by LINEAR at Socorro.
Stephen Gerald Warrener (b. 1987) was awarded second place in the 2006 Intel International Science and Engineering Fair for his engineering project. He attends the East Noble High School, Kendallville, Indiana, U.S.A.Naming citation (20060711/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Warrener is today
Seen from above the solar system on 2026-10-14: Warrener is 2.47 au from the Sun and 3.15 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21671 |
| Provisional designation | 1999 RP12 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.20 km (#12,277 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.252 |
| Rotation period | 4.52 hours |
| Absolute magnitude (H) | 13.9 |
| Orbital period | 4.20 years |
| Semi-major axis | 2.60 au |
| Perihelion – aphelion | 2.47 – 2.74 au |
| Eccentricity | 0.0529 |
| Inclination | 14.7° |
| Closest distance between its orbit and Earth's (MOID) | 1.48 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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