(21743) Michaelsegal Main-belt Asteroid
Discovered on 9 September 1999 by LINEAR at Socorro.
Michael Segal (b. 1987) was awarded first place and Best in Category in the 2005 Intel International Science and Engineering Fair for his biochemistry project. He attends the Central High School, Philadelphia, Pennsylvania, U.S.A.Naming citation (20050822/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Michaelsegal is today
Seen from above the solar system on 2026-10-14: Michaelsegal is 2.72 au from the Sun and 3.62 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21743 |
| Provisional designation | 1999 RB164 |
| Orbit class | Main-belt Asteroid |
| Diameter | 6.27 km (#8,554 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0860 |
| Absolute magnitude (H) | 14.78 |
| Orbital period | 4.16 years |
| Semi-major axis | 2.59 au |
| Perihelion – aphelion | 2.45 – 2.73 au |
| Eccentricity | 0.0529 |
| Inclination | 5.77° |
| Closest distance between its orbit and Earth's (MOID) | 1.45 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Michael
- (3192) A'Hearn
- (4477) Kelley
- (4599) Rowan
- (5373) Michaelkurtz
- (5554) Keesey
- (5569) Colby
- (6406) Mikejura
- (6569) Ondaatje
- (7738) Heyman
- (7936) Mikemagee
- (8032) Michaeladams
- (8129) Michaelbusch
All asteroids named after someone called Michael
Also discovered on 9 September 1999
- (12127) Mamiya
- (12130) Mousa
- (12589) Davidanand
- (12590) Ballantine
- (12591) Bergey
- (12592) Brianchen
- (12593) Shashlov
- (12594) Sidorclare
- (12595) Amandashaw
- (12596) Shukla
- (12597) Williamdaniel
- (12598) Sierra