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Discovery and designation
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| Discovery site | La Plata |
| Discovery date | April 24, 1957 |
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Designations
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| MPC designation | 3648 |
| Alternate name(s) | 1957 HK |
| Epoch May 14, 2008 | |
| Ap | 2.6719391 |
| Peri | 2.1595613 |
| Eccentricity | 0.1060494 |
| Orbital period | 1371.4389160 |
| Mean anomaly | 190.63734 |
| Inclination | 7.89466 |
| Longitude of ascending node | 209.06785 |
| Argument of peri | 32.91722 |
| Absolute magnitude (H) | 13.0 |
3648 Raffinetti (1957 HK) is a main-belt asteroid discovered on April 24, 1957 at La Plata.
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