(20500) Avner Main-belt Asteroid
Discovered on 4 September 1999 by CSS at Catalina.
Lillian I. Avner (b. 1952), Emergency Medicine Physician at Martin Memorial and Medical Director of Martin County Fire Rescue, dedicated her life to helping people. Lil's passion and leadership guided the ER and Fire Rescue from infancy to maturity. She contributed to thousands of lives saved through her decades of service.Naming citation (MPC batch dated 2018-05-29), IAU / Minor Planet Center, via NASA/JPL
Where Avner is today
Seen from above the solar system on 2026-10-14: Avner is 2.63 au from the Sun and 3.36 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20500 |
| Provisional designation | 1999 RP3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.96 km (#15,327 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.292 |
| Absolute magnitude (H) | 14.91 |
| Orbital period | 3.50 years |
| Semi-major axis | 2.31 au |
| Perihelion – aphelion | 1.97 – 2.64 au |
| Eccentricity | 0.144 |
| Inclination | 5.28° |
| Closest distance between its orbit and Earth's (MOID) | 0.994 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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All asteroids named after someone called Lillian
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