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Discovery and designation
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| Discovered by | E. F. Helin |
| Discovery site | Palomar |
| Discovery date | March 12, 1988 |
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Designations
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| MPC designation | 5278 |
| Alternate name(s) | 1988 EJ1 |
| Epoch May 14, 2008 | |
| Ap | 2.4061454 |
| Peri | 2.0307826 |
| Eccentricity | 0.0845997 |
| Orbital period | 1206.9159098 |
| Mean anomaly | 37.69186 |
| Inclination | 4.10183 |
| Longitude of ascending node | 225.47306 |
| Argument of peri | 305.51130 |
| Absolute magnitude (H) | 13.4 |
5278 Polly (1988 EJ1) is a main-belt asteroid discovered on March 12, 1988 by E. F. Helin at Palomar.
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