(21852) Bolander Main-belt Asteroid
Discovered on 7 October 1999 by LINEAR at Socorro.
John Anthony Bolander (b. 1991) is a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his physical science project. He attends the Our Lady of Perpetual Help School, New Albany, Indiana.Naming citation (20051019/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Bolander is today
Seen from above the solar system on 2026-10-14: Bolander is 2.21 au from the Sun and 1.77 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21852 |
| Provisional designation | 1999 TR143 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.93 km (#9,047 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0600 |
| Absolute magnitude (H) | 15.05 |
| Orbital period | 3.78 years |
| Semi-major axis | 2.43 au |
| Perihelion – aphelion | 2.06 – 2.79 au |
| Eccentricity | 0.150 |
| Inclination | 5.87° |
| Closest distance between its orbit and Earth's (MOID) | 1.08 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called John
- (3882) Johncox
- (3893) DeLaeter
- (4089) Galbraith
- (4147) Lennon
- (4525) Johnbauer
- (4656) Huchra
- (4987) Flamsteed
- (5207) Hearnshaw
- (5216) Cannizzo
- (5362) Johnyoung
- (5517) Johnerogers
- (5558) Johnnapier
All asteroids named after someone called John
Also discovered on 7 October 1999
- (12931) Mario
- (16089) Lamb
- (16090) Lukaszewski
- (16091) Malchiodi
- (19704) Medlock
- (20643) Angelicaliu
- (20644) Amritdas
- (20645) Ryderstrauss
- (20646) Nikhilgupta
- (20647) Ryujiokazaki
- (21850) Abshir
- (21853) Kelseykay