(21989) Werntz Main-belt Asteroid
Discovered on 5 December 1999 by LINEAR at Socorro.
Ruslan Alan Werntz (b. 1989) is a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his biochemistry, medicine, health, & microbiology project. He attends the Coppell Middle School West, Coppell, Texas.Naming citation (20051019/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Werntz is today
Seen from above the solar system on 2026-10-14: Werntz is 3.02 au from the Sun and 2.22 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21989 |
| Provisional designation | 1999 XU20 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.11 km (#12,482 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.211 |
| Absolute magnitude (H) | 14.17 |
| Orbital period | 5.52 years |
| Semi-major axis | 3.12 au |
| Perihelion – aphelion | 2.59 – 3.66 au |
| Eccentricity | 0.172 |
| Inclination | 3.83° |
| Closest distance between its orbit and Earth's (MOID) | 1.61 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 5 December 1999
- (13858) Ericchristensen
- (14232) Curtismiller
- (14682) Davidhirsch
- (16112) Vitaris
- (20711) Seijisugita
- (20712) Shashiganesh
- (20725) Juliuscsotonyi
- (22022) Gould
- (22025) Dorisdaou
- (22026) Lindabillings
- (22027) Romanakofler
- (25455) Anissamak