(346721) Panchengdong Main-belt Asteroid
Discovered on 14 January 2009 by Shandong University at Weihai.
Chengdong Pan (1934–1997) was an outstanding Chinese mathematician of number theory. He was a Chinese Academy of Sciences academician and an educator as the former president of Shandong University. Pan's research on the Goldbach Conjecture has been widely recognized.Naming citation (WGSBN Bull. 4, #15, 10), IAU / Minor Planet Center, via NASA/JPL
Where Panchengdong is today
Seen from above the solar system on 2026-10-14: Panchengdong is 2.79 au from the Sun and 3.75 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 346721 |
| Provisional designation | 2009 AP15 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 16.6 |
| Orbital period | 4.17 years |
| Semi-major axis | 2.59 au |
| Perihelion – aphelion | 2.26 – 2.91 au |
| Eccentricity | 0.125 |
| Inclination | 11.0° |
| Closest distance between its orbit and Earth's (MOID) | 1.29 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.