(21481) Johnwarren Main-belt Asteroid
Discovered on 23 April 1998 by LINEAR at Socorro.
John Warren mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. He teaches at the C. K. McClatchy High School, Sacramento, California.Naming citation (20050224/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Johnwarren is today
Seen from above the solar system on 2026-10-14: Johnwarren is 2.29 au from the Sun and 3.17 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21481 |
| Provisional designation | 1998 HP125 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.62 km (#16,025 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.310 |
| Rotation period | 277 hours |
| Absolute magnitude (H) | 15.14 |
| Orbital period | 3.63 years |
| Semi-major axis | 2.36 au |
| Perihelion – aphelion | 2.22 – 2.51 au |
| Eccentricity | 0.0620 |
| Inclination | 6.28° |
| Closest distance between its orbit and Earth's (MOID) | 1.24 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called John
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