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Discovery and designation
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| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg |
| Discovery date | August 2, 1949 |
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Designations
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| MPC designation | 4001 |
| Named after | Ptolemy |
| Alternate name(s) | 1949 PV |
| Epoch May 14, 2008 | |
| Ap | 2.6812879 |
| Peri | 1.8932715 |
| Eccentricity | 0.1722606 |
| Orbital period | 1263.5060461 |
| Mean anomaly | 348.83572 |
| Inclination | 5.45628 |
| Longitude of ascending node | 130.78477 |
| Argument of peri | 203.93603 |
| Absolute magnitude (H) | 13.6 |
4001 Ptolemaeus (1949 PV) is a main-belt asteroid discovered on August 2, 1949 by K. Reinmuth at Heidelberg.
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