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Discovery and designation
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| Discovered by | Y. Vaisala |
| Discovery site | Turku |
| Discovery date | March 3, 1943 |
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Designations
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| MPC designation | 2333 |
| Named after | Henrik Gabriel Porthan |
| Alternate name(s) | 1943 EP |
| Epoch May 14, 2008 | |
| Ap | 3.0063924 |
| Peri | 2.2845296 |
| Eccentricity | 0.1364342 |
| Orbital period | 1571.6306008 |
| Mean anomaly | 78.08198 |
| Inclination | 11.92664 |
| Longitude of ascending node | 40.25892 |
| Argument of peri | 97.78104 |
| Geometric albedo | 0.0952 |
| Absolute magnitude (H) | 11.50 |
2333 Porthan (1943 EP) is a main-belt asteroid discovered on 3 March 1943 by Y. Vaisala at Turku.
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