(9923) Ronaldthiel Main-belt Asteroid
Discovered on 7 March 1981 by S. J. Bus at Siding Spring.
Ronald L. Thiel (b. 1937) is the Division Chief of the Traffic Division for the County of Hawaii. In his capacity as traffic engineer, he has overseen the installation of shielded LED streetlights and other lighting that is designed to minimize impact on the dark night sky over the Mauna Kea Observatories.Naming citation (MPC batch dated 2017-03-12), IAU / Minor Planet Center, via NASA/JPL
Where Ronaldthiel is today
Seen from above the solar system on 2026-10-14: Ronaldthiel is 2.69 au from the Sun and 1.79 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9923 |
| Provisional designation | 1981 EB24 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.08 km (#12,532 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.243 |
| Absolute magnitude (H) | 14.3 |
| Orbital period | 4.71 years |
| Semi-major axis | 2.81 au |
| Perihelion – aphelion | 2.61 – 3.01 au |
| Eccentricity | 0.0699 |
| Inclination | 4.40° |
| Closest distance between its orbit and Earth's (MOID) | 1.64 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Ronald
- (2285) Ron Helin
- (3579) Rockholt
- (6949) Zissell
- (9852) Gora
- (10508) Haughey
- (11724) Ronaldhsu
- (13497) Ronstone
- (16813) Ronmastaler
- (17853) Ronaldsayer
- (18239) Ekers
- (20465) Vervack
- (21451) Fisher
All asteroids named after someone called Ronald
Also discovered on 7 March 1981
- (5365) Fievez
- (6030) Zolensky
- (8796) Sonnett
- (8798) Tarantino
- (9278) Matera
- (9284) Juansanchez
- (9528) Kuppers
- (16372) Demichele