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Discovery and designation
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| Discovered by | Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels |
| Discovery site | Palomar Observatory |
| Discovery date | October 17, 1960 |
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Designations
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| MPC designation | 4356 |
| Named after | Marathon |
| Alternate name(s) | 9522 P-L |
| Epoch May 14, 2008 | |
| Ap | 3.3417034 |
| Peri | 2.2569366 |
| Eccentricity | 0.1937554 |
| Orbital period | 1710.7134188 |
| Mean anomaly | 131.98867 |
| Inclination | 7.45966 |
| Longitude of ascending node | 2.49345 |
| Argument of peri | 262.81664 |
| Geometric albedo | 0.0665 |
| Absolute magnitude (H) | 13.10 |
4356 Marathon (9522 P-L) is a main-belt asteroid discovered on October 17, 1960 by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at Palomar Observatory.
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