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Discovery and designation
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| Discovered by | P. Wild |
| Discovery site | Zimmerwald |
| Discovery date | September 8, 1983 |
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Designations
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| MPC designation | 3258 |
| Alternate name(s) | 1983 RJ |
| Epoch May 14, 2008 | |
| Ap | 2.6383826 |
| Peri | 1.7732404 |
| Eccentricity | 0.1961052 |
| Orbital period | 1196.6055889 |
| Mean anomaly | 198.49457 |
| Inclination | 7.55677 |
| Longitude of ascending node | 45.13260 |
| Argument of peri | 296.78816 |
| Absolute magnitude (H) | 13.4 |
3258 Somnium (1983 RJ) is a main-belt asteroid discovered on September 8, 1983 by P. Wild at Zimmerwald.
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