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Discovery and designation
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| Discovered by | Purple Mountain Observatory |
| Discovery site | Nanking |
| Discovery date | December 20, 1981 |
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Designations
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| MPC designation | 3611 |
| Named after | Dabu County |
| Alternate name(s) | 1981 YY1 |
| Epoch May 14, 2008 | |
| Ap | 3.3840217 |
| Peri | 2.1951981 |
| Eccentricity | 0.2130806 |
| Orbital period | 1701.8200445 |
| Mean anomaly | 260.15487 |
| Inclination | 8.48864 |
| Longitude of ascending node | 135.72227 |
| Argument of peri | 290.98806 |
| Absolute magnitude (H) | 12.7 |
3611 Dabu (1981 YY1) is a main-belt asteroid discovered on December 20, 1981 by Purple Mountain Observatory at Nanking.
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