(20559) Sheridanlamp Main-belt Asteroid
Discovered on 9 September 1999 by LINEAR at Socorro.
Sheridan Lamp mentored a finalist in the 2004 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. She teaches at the Vernon Middle School, Vernon, Texas.Naming citation (20041028/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Sheridanlamp is today
Seen from above the solar system on 2026-10-14: Sheridanlamp is 3.04 au from the Sun and 3.52 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20559 |
| Provisional designation | 1999 RJ118 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.65 km (#13,589 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.175 |
| Absolute magnitude (H) | 14.79 |
| Orbital period | 4.17 years |
| Semi-major axis | 2.59 au |
| Perihelion – aphelion | 2.10 – 3.09 au |
| Eccentricity | 0.190 |
| Inclination | 7.42° |
| Closest distance between its orbit and Earth's (MOID) | 1.09 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 9 September 1999
- (12127) Mamiya
- (12130) Mousa
- (12589) Davidanand
- (12590) Ballantine
- (12591) Bergey
- (12592) Brianchen
- (12593) Shashlov
- (12594) Sidorclare
- (12595) Amandashaw
- (12596) Shukla
- (12597) Williamdaniel
- (12598) Sierra