(21854) Brendandwyer Main-belt Asteroid
Discovered on 7 October 1999 by LINEAR at Socorro.
Brendan John Dwyer (b. 1991) is a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his environmental sciences project. He attends the Northport Middle School, Northport, New York.Naming citation (20051019/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Brendandwyer is today
Seen from above the solar system on 2026-10-14: Brendandwyer is 2.95 au from the Sun and 3.53 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21854 |
| Provisional designation | 1999 TJ147 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.72 km (#13,406 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0970 |
| Absolute magnitude (H) | 14.88 |
| Orbital period | 4.24 years |
| Semi-major axis | 2.62 au |
| Perihelion – aphelion | 2.29 – 2.95 au |
| Eccentricity | 0.125 |
| Inclination | 4.59° |
| Closest distance between its orbit and Earth's (MOID) | 1.28 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Brendan
All asteroids named after someone called Brendan
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
- (21852) Bolander