(21447) Yungchieh Main-belt Asteroid
Discovered on 18 April 1998 by LINEAR at Socorro.
Chen Yung-Chieh (b. 1987) was awarded first place in the 2006 Intel International Science and Engineering Fair for his engineering team project. He attends the Taipei Municipal LiShan High School, Taipei, Taiwan, Chinese Taipei.Naming citation (20060711/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Yungchieh is today
Seen from above the solar system on 2026-10-14: Yungchieh is 2.75 au from the Sun and 3.56 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21447 |
| Provisional designation | 1998 HZ18 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.25 km (#16,693 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.419 |
| Absolute magnitude (H) | 15.24 |
| Orbital period | 3.64 years |
| Semi-major axis | 2.36 au |
| Perihelion – aphelion | 1.86 – 2.87 au |
| Eccentricity | 0.214 |
| Inclination | 1.35° |
| Closest distance between its orbit and Earth's (MOID) | 0.858 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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All asteroids named after someone called Chen
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