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Discovery
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| Discovered by | Reinmuth, K. |
| Discovery site | Heidelberg |
| Discovery date | September 4, 1951 |
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Designations
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| MPC designation | 1643 |
| Named after | Ernest William Brown |
| Alternate name(s) | 1951 RQ |
| Epoch May 14, 2008 | |
| Ap | 2.9903595 |
| Peri | 1.9872221 |
| Eccentricity | 0.2015311 |
| Orbital period | 1434.1051966 |
| Mean anomaly | 134.55429 |
| Inclination | 3.52014 |
| Longitude of ascending node | 288.26378 |
| Argument of peri | 89.59099 |
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Physical characteristics
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| Absolute magnitude (H) | 12.8 |
1643 Brown (1951 RQ) is a main-belt asteroid discovered on September 4, 1951 by Reinmuth, K. at Heidelberg.
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