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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 | July 14, 1999 |
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Designations
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| MPC designation | 20480 |
| Alternate name(s) | 1999 NT31 |
| Epoch May 14, 2008 | |
| Ap | 2.8942174 |
| Peri | 1.9521256 |
| Eccentricity | 0.1943923 |
| Orbital period | 1377.7634490 |
| Mean anomaly | 61.74965 |
| Inclination | 1.62617 |
| Longitude of ascending node | 118.89617 |
| Argument of peri | 263.90038 |
| Absolute magnitude (H) | 14.6 |
20480 Antonschraut (1999 NT31) is a main-belt asteroid discovered on July 14, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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