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Discovery and designation
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| Discovered by | Purple Mountain Observatory |
| Discovery site | Nanking |
| Discovery date | October 16, 1965 |
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Designations
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| MPC designation | 5539 |
| Named after | Lim Por-yen |
| Alternate name(s) | 1965 UA1 |
| Epoch May 14, 2008 | |
| Ap | 2.8177901 |
| Peri | 2.0545797 |
| Eccentricity | 0.1566405 |
| Orbital period | 1388.8770470 |
| Mean anomaly | 41.52136 |
| Inclination | 1.82510 |
| Longitude of ascending node | 295.84515 |
| Argument of peri | 122.18388 |
| Absolute magnitude (H) | 12.6 |
5539 Limporyen (1965 UA1) is a main-belt asteroid discovered on October 16, 1965 by the Purple Mountain Observatory at Nanking.
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