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Discovery and designation
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| Discovered by | A. Galad and A. Pravda |
| Discovery site | Modra |
| Discovery date | March 5, 1997 |
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Designations
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| MPC designation | 11657 |
| Alternate name(s) | 1997 EN7 |
| Epoch May 14, 2008 | |
| Ap | 2.7271345 |
| Peri | 1.8501977 |
| Eccentricity | 0.1915825 |
| Orbital period | 1264.6550244 |
| Mean anomaly | 206.81155 |
| Inclination | 2.54687 |
| Longitude of ascending node | 182.57674 |
| Argument of peri | 159.66771 |
| Absolute magnitude (H) | 14.6 |
11657 Antonhajduk (1997 EN7) is a main-belt asteroid discovered on March 5, 1997 by A. Galad and A. Pravda at Modra.
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