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Discovery
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| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg |
| Discovery date | July 24, 1933 |
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Designations
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| MPC designation | 1645 |
| Alternate name(s) | 1933 OJ |
| Epoch May 14, 2008 | |
| Ap | 3.4029287 |
| Peri | 2.7187343 |
| Eccentricity | 0.1117661 |
| Orbital period | 1955.9490925 |
| Mean anomaly | 314.52987 |
| Inclination | 1.02071 |
| Longitude of ascending node | 266.52225 |
| Argument of peri | 101.18664 |
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Physical characteristics
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| Albedo | 0.0991 |
| Absolute magnitude (H) | 10.70 |
1645 Waterfield (1933 OJ) is a main-belt asteroid discovered on July 24, 1933 by K. Reinmuth at Heidelberg.
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