(21633) Hsingpenyuan Main-belt Asteroid
Discovered on 13 July 1999 by LINEAR at Socorro.
Hsing Pen-Yuan (b. 1986) was awarded first place and Best in Category in the 2005 Intel International Science and Engineering Fair for his engineering team project. He also received the EU Contest for Young Scientists Award. He attends the Taipei Municipal Lishan Senior High School, Taipei, Chinese Taipei.Naming citation (20050822/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hsingpenyuan is today
Seen from above the solar system on 2026-10-14: Hsingpenyuan is 2.50 au from the Sun and 2.79 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21633 |
| Provisional designation | 1999 NW11 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.52 km (#13,922 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.272 |
| Absolute magnitude (H) | 14.8 |
| Orbital period | 3.64 years |
| Semi-major axis | 2.36 au |
| Perihelion – aphelion | 2.15 – 2.58 au |
| Eccentricity | 0.0895 |
| Inclination | 5.61° |
| Closest distance between its orbit and Earth's (MOID) | 1.14 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 13 July 1999
- (11746) Thomjansen
- (11747) Libbykamen
- (12118) Mirotsin
- (12119) Memamis
- (12121) Greenwald
- (12572) Sadegh
- (15501) Pepawlowski
- (18821) Markhavel
- (18836) Raymundto
- (19582) Blow
- (19584) Sarahgerin
- (19585) Zachopkins