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Discovery and designation
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| Discovered by | S. J. Bus |
| Discovery site | Siding Spring |
| Discovery date | March 3, 1981 |
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Designations
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| MPC designation | 3891 |
| Alternate name(s) | 1981 EY31 |
| Epoch May 14, 2008 | |
| Ap | 2.8365215 |
| Peri | 1.9734007 |
| Eccentricity | 0.1794459 |
| Orbital period | 1362.2615631 |
| Mean anomaly | 41.29030 |
| Inclination | 1.59903 |
| Longitude of ascending node | 269.56316 |
| Argument of peri | 346.15114 |
| Absolute magnitude (H) | 14.7 |
3891 Werner (1981 EY31) is a main-belt asteroid discovered on March 3, 1981 by S. J. Bus at Siding Spring.
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