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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 | May 10, 1999 |
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Designations
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| MPC designation | 11413 |
| Alternate name(s) | 1999 JG21 |
| Epoch May 14, 2008 | |
| Ap | 2.6520758 |
| Peri | 1.9780854 |
| Eccentricity | 0.1455652 |
| Orbital period | 1286.6119733 |
| Mean anomaly | 28.43849 |
| Inclination | 3.74124 |
| Longitude of ascending node | 31.92800 |
| Argument of peri | 1.95534 |
| Absolute magnitude (H) | 14.3 |
11413 Catanach (1999 JG21) is a main-belt asteroid discovered on May 10, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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