(20539) Gadberry Main-belt Asteroid
Discovered on 7 September 1999 by LINEAR at Socorro.
Sandra Gadberry mentored a finalist in the 2004 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. She teaches at the St. Leo the Great School, Lancaster, Pennsylvania.Naming citation (20041028/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Gadberry is today
Seen from above the solar system on 2026-10-14: Gadberry is 3.13 au from the Sun and 4.12 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20539 |
| Provisional designation | 1999 RT86 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.58 km (#11,459 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.111 |
| Absolute magnitude (H) | 14.44 |
| Orbital period | 4.83 years |
| Semi-major axis | 2.86 au |
| Perihelion – aphelion | 2.55 – 3.16 au |
| Eccentricity | 0.106 |
| Inclination | 3.35° |
| Closest distance between its orbit and Earth's (MOID) | 1.55 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Sandra
- (7377) Pizzarello
- (20537) Sandraderosa
- (20585) Wentworth
- (28680) Sandralitvin
- (31268) Welty
- (78453) Bullock
- (114612) Sandrasavaglio
- (283277) Faber
- (761081) Sandraeglite
All asteroids named after someone called Sandra
Also discovered on 7 September 1999
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- (12578) Bensaur
- (12585) Katschwarz
- (12586) Juliaspeyer
- (12588) Arseneau
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- (12924) Madisonicole
- (13818) Ullery
- (14214) Hirsch
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- (16067) Brandonfan