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Discovery and designation
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| Discovered by | Mrkos, A. |
| Discovery site | Klet |
| Discovery date | September 2, 1986 |
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Designations
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| MPC designation | 3781 |
| Named after | George J. Dufek |
| Alternate name(s) | 1986 RG1 |
| Epoch May 14, 2008 | |
| Ap | 3.0564912 |
| Peri | 2.6312914 |
| Eccentricity | 0.0747567 |
| Orbital period | 1751.7330114 |
| Mean anomaly | 185.57379 |
| Inclination | 2.04267 |
| Longitude of ascending node | 183.69766 |
| Argument of peri | 159.94619 |
| Geometric albedo | 0.0578 |
| Absolute magnitude (H) | 12.1 |
3781 Dufek (1986 RG1) is a main-belt asteroid discovered on September 2, 1986 by Mrkos, A. at Klet.
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