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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 24, 2000 |
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Designations
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| MPC designation | 20839 |
| Alternate name(s) | 2000 US55 |
| Epoch May 14, 2008 | |
| Ap | 2.8657932 |
| Peri | 2.5360898 |
| Eccentricity | 0.0610349 |
| Orbital period | 1621.3291251 |
| Mean anomaly | 329.36735 |
| Inclination | 3.62083 |
| Longitude of ascending node | 131.34020 |
| Argument of peri | 199.95316 |
| Absolute magnitude (H) | 14.7 |
20839 Bretharrison (2000 US55) is a main-belt asteroid discovered on October 24, 2000 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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