(18639) Aoyunzhiyuanzhe Main-belt Asteroid
Discovered on 5 March 1998 by Beijing Schmidt CCD Asteroid Program at Xinglong.
Aoyunzhiyuanzhe, meaning “Olympic Games Volunteer”, honors the 1.7 million volunteers whose work, devotion, smiles and service during the 2008 Olympic and Paralympic Games touched the whole world, setting a milestone in voluntary service and opening a fresh chapter in volunteerism in China.Naming citation (20081212/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Aoyunzhiyuanzhe is today
Seen from above the solar system on 2026-10-14: Aoyunzhiyuanzhe is 2.69 au from the Sun and 2.08 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 18639 |
| Provisional designation | 1998 ER8 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 15.14 |
| Orbital period | 4.42 years |
| Semi-major axis | 2.69 au |
| Perihelion – aphelion | 2.63 – 2.75 au |
| Eccentricity | 0.0223 |
| Inclination | 2.52° |
| Closest distance between its orbit and Earth's (MOID) | 1.62 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.