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Discovery and designation
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| Discovered by | Robert H. McNaught |
| Discovery site | Siding Spring |
| Discovery date | December 21, 1989 |
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Designations
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| MPC designation | 4504 |
| Alternate name(s) | 1989 YO |
| Epoch May 14, 2008 | |
| Ap | 2.9474971 |
| Peri | 2.2514465 |
| Eccentricity | 0.1338831 |
| Orbital period | 1530.8268991 |
| Mean anomaly | 163.85325 |
| Inclination | 14.83260 |
| Longitude of ascending node | 180.85435 |
| Argument of peri | 226.91200 |
| Absolute magnitude (H) | 13.4 |
4504 Jenkinson (1989 YO) is a main-belt asteroid discovered on December 21, 1989 by Robert H. McNaught at Siding Spring.
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