(18803) Hillaryoas Main-belt Asteroid
Discovered on 12 May 1999 by LINEAR at Socorro.
Hillary Joan Oas (b. 1987) was awarded third place in the 2003 Intel International Science and Engineering Fair for her environmental science team project. She attends the Winona Senior High School, Winona, Minnesota, U.S.A.Naming citation (20040830/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hillaryoas is today
Seen from above the solar system on 2026-10-14: Hillaryoas is 2.01 au from the Sun and 2.99 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 18803 |
| Provisional designation | 1999 JH77 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.91 km (#12,977 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.201 |
| Rotation period | 5.40 hours |
| Absolute magnitude (H) | 14.43 |
| Orbital period | 3.45 years |
| Semi-major axis | 2.28 au |
| Perihelion – aphelion | 1.98 – 2.58 au |
| Eccentricity | 0.131 |
| Inclination | 6.05° |
| Closest distance between its orbit and Earth's (MOID) | 0.979 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Hillary
All asteroids named after someone called Hillary
Also discovered on 12 May 1999
- (16059) Marybuda
- (16060) Dahliadry
- (17124) Rishavalera
- (17125) Vijayakumar
- (17126) Sophiawang
- (17127) Ryanwestcott
- (17131) Paulazhu
- (17138) Burgosrosario
- (17139) Malyshev
- (17140) Yangkevin
- (17141) Bhatia
- (17143) Andrewbrinton