(21817) Yingling Main-belt Asteroid
Discovered on 4 October 1999 by LINEAR at Socorro.
Chelsey Ann Yingling (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for her environmental sciences project. She attends the Tucson Magnet High School, Tucson, Arizona, U.S.A.Naming citation (20050822/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Yingling is today
Seen from above the solar system on 2026-10-14: Yingling is 2.22 au from the Sun and 2.51 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21817 |
| Provisional designation | 1999 TG32 |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.04 km (#6,548 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0450 |
| Absolute magnitude (H) | 14.44 |
| Orbital period | 4.33 years |
| Semi-major axis | 2.66 au |
| Perihelion – aphelion | 2.18 – 3.14 au |
| Eccentricity | 0.181 |
| Inclination | 4.22° |
| Closest distance between its orbit and Earth's (MOID) | 1.19 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 4 October 1999
- (13407) Ikukomakino
- (15093) Lestermackey
- (15509) Annejing
- (15510) Phoeberounds
- (16088) Jessgoldstein
- (17179) Codina
- (20626) Rider-Stokes
- (20638) Lingchen
- (20639) Michellouie
- (20641) Yenuanchen
- (20642) Laurajohnson
- (21804) Vaclavneumann