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Discovery
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| Discovered by | LINEAR |
| Discovery date | October 4, 1999 |
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Designations
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| Alternate name(s) | 1992 AO6; 1999 TD109 |
| Minor planet category |
Main belt |
| Epoch November 26, 2005 (JD 2453700.5) | |
| Aphelion | 436.460 Gm (2.918 AU) |
| Perihelion | 357.598 Gm (2.390 AU) |
| Semi-major axis | 397.029 Gm (2.654 AU) |
| Eccentricity | 0.099 |
| Orbital period | 1579.223 d (4.32 a) |
| Average orbital speed | 18.24 km/s |
| Mean anomaly | 49.287° |
| Inclination | 9.709° |
| Longitude of ascending node | 299.541° |
| Argument of perihelion | 168.315° |
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Physical characteristics
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| Dimensions | ? km |
| Mass | ?×10? kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | ? m/s² |
| Escape velocity | ? km/s |
| Rotation period | ? d |
| Albedo | 0.1? |
| Temperature | ~171 K |
| Spectral type | ? |
| Absolute magnitude (H) | 14.1 |
(20639) Michellouie is an asteroid discovered on 4 October 1999 by MIT Lincoln Laboratory's Near-Earth Asteroid Research (LINEAR) program.
It was named for Michelle Louie (b. 1986) who was awarded second place in the 2004 Intel International Science and Engineering Fair for her botany project. She attends the Kings Park High School, Kings Park, New York, U.S.A.
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