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Discovery and designation
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| Discovered by | Bowell, E. |
| Discovery site | Flagstaff (AM) |
| Discovery date | September 26, 1987 |
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Designations
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| MPC designation | 3991 |
| Alternate name(s) | 1987 SW3 |
| Epoch May 14, 2008 | |
| Ap | 2.6407098 |
| Peri | 1.8601074 |
| Eccentricity | 0.1734357 |
| Orbital period | 1233.0778054 |
| Mean anomaly | 102.40048 |
| Inclination | 3.87086 |
| Longitude of ascending node | 282.95708 |
| Argument of peri | 355.75843 |
| Absolute magnitude (H) | 13.3 |
3991 Basilevsky (1987 SW3) is a main-belt asteroid discovered on September 26, 1987 by Bowell, E. at Flagstaff (AM).
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