(99503) Leewonchul Main-belt Asteroid
Discovered on 16 February 2002 by Y.-B. Jeon at Bohyunsan.
Lee, Won Chul (David W. Lee, 1896-1963) studied η Aql (the “Won Chul Star”) at the University of Michigan and in 1926 became the first Korean to earn a Ph.D. degree. On returning to Korea, he became a professor at Yonhee College and in 1945 was appointed the first director of the National Observatory in Seoul.Naming citation (20060413/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Leewonchul is today
Seen from above the solar system on 2026-10-14: Leewonchul is 2.83 au from the Sun and 1.97 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 99503 |
| Provisional designation | 2002 DB1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.12 km (#12,464 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0600 |
| Absolute magnitude (H) | 15.75 |
| Orbital period | 3.73 years |
| Semi-major axis | 2.41 au |
| Perihelion – aphelion | 1.93 – 2.88 au |
| Eccentricity | 0.198 |
| Inclination | 7.69° |
| Closest distance between its orbit and Earth's (MOID) | 0.932 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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