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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 | April 15, 1999 |
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Designations
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| MPC designation | 17921 |
| Alternate name(s) | 1999 GC13 |
| Epoch May 14, 2008 | |
| Ap | 2.4705728 |
| Peri | 2.1809604 |
| Eccentricity | 0.0622617 |
| Orbital period | 1295.5304738 |
| Mean anomaly | 202.64302 |
| Inclination | 7.59688 |
| Longitude of ascending node | 115.06883 |
| Argument of peri | 94.64894 |
| Absolute magnitude (H) | 15.0 |
17921 Aldeobaldia (1999 GC13) is a main belt asteroid discovered on April 15, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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