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Discovery and designation
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| Discovered by | S. J. Bus |
| Discovery site | Siding Spring Observatory |
| Discovery date | March 1, 1981 |
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Designations
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| MPC designation | 5663 |
| Alternate name(s) | 1981 EQ12 |
| Epoch May 14, 2008 | |
| Ap | 3.0336028 |
| Peri | 1.7473256 |
| Eccentricity | 0.2690434 |
| Orbital period | 1349.9627242 |
| Mean anomaly | 346.42773 |
| Inclination | 6.45134 |
| Longitude of ascending node | 240.25435 |
| Argument of peri | 95.48360 |
| Absolute magnitude (H) | 14.5 |
5663 McKeegan (1981 EQ12) is a main-belt asteroid discovered on March 1, 1981 by S. J. Bus at Siding Spring Observatory in the course of the U.K. Schmidt-Caltech Asteroid Survey.
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