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Discovery and designation
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| Discovered by | Purple Mountain Observatory |
| Discovery site | Nanking |
| Discovery date | October 28, 1978 |
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Designations
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| MPC designation | 3509 |
| Named after | Sanshui District |
| Alternate name(s) | 1978 UH2 |
| Epoch May 14, 2008 | |
| Ap | 2.9936016 |
| Peri | 2.2046702 |
| Eccentricity | 0.1517680 |
| Orbital period | 1530.5301871 |
| Mean anomaly | 55.72495 |
| Inclination | 12.81131 |
| Longitude of ascending node | 219.89937 |
| Argument of peri | 139.52053 |
| Absolute magnitude (H) | 12.1 |
3509 Sanshui (1978 UH2) is a main-belt asteroid discovered on October 28, 1978 by Purple Mountain Observatory at Nanking.
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