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Discovery and designation
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| Discovered by | Lincoln Laboratory Near-Earth Asteroid Research Team |
| Discovery site | Socorro |
| Discovery date | October 7, 1999 |
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Designations
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| MPC designation | 20643 |
| Alternate name(s) | 1999 TK142 |
| Epoch May 14, 2008 | |
| Ap | 2.7458952 |
| Peri | 2.1141212 |
| Eccentricity | 0.1299942 |
| Orbital period | 1383.5983866 |
| Mean anomaly | 246.69521 |
| Inclination | 2.23182 |
| Longitude of ascending node | 251.54782 |
| Argument of peri | 313.24199 |
| Absolute magnitude (H) | 15.5 |
20643 Angelicaliu (1999 TK142) is a main-belt asteroid discovered on October 7, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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