(21356) Karlplank Main-belt Asteroid
Discovered on 31 March 1997 by LINEAR at Socorro.
Karl James Plank (b. 1987) is a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors, for his chemistry project. He attends the Squalicum High School, Bellingham, Washington.Naming citation (20050224/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Karlplank is today
Seen from above the solar system on 2026-10-14: Karlplank is 2.73 au from the Sun and 2.69 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21356 |
| Provisional designation | 1997 FG4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.85 km (#5,875 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0470 |
| Absolute magnitude (H) | 14.44 |
| Orbital period | 4.40 years |
| Semi-major axis | 2.68 au |
| Perihelion – aphelion | 2.60 – 2.77 au |
| Eccentricity | 0.0308 |
| Inclination | 4.52° |
| Closest distance between its orbit and Earth's (MOID) | 1.59 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Karl
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- (4463) Marschwarzschild
- (5171) Augustesen
- (6059) Diefenbach
- (6597) Kreil
- (6712) Hornstein
- (10099) Glazebrook
- (11434) Lohnert
- (13816) Stulpner
- (13977) Frisch
- (14014) Munchhausen
- (14100) Weierstrass
All asteroids named after someone called Karl
Also discovered on 31 March 1997
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- (20206) Annewellbrock
- (20207) Dyckovsky
- (20208) Philiphe
- (21355) Pikovskaya
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- (23667) Savinakim
- (23668) Eunbekim