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Discovery and designation
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| Discovered by | E. W. Elst |
| Discovery site | La Silla |
| Discovery date | January 25, 1987 |
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Designations
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| MPC designation | 3631 |
| Alternate name(s) | 1987 BV1 |
| Epoch May 14, 2008 | |
| Ap | 3.3255086 |
| Peri | 2.8701748 |
| Eccentricity | 0.0734921 |
| Orbital period | 1991.5318957 |
| Mean anomaly | 155.73810 |
| Inclination | 14.37738 |
| Longitude of ascending node | 151.20732 |
| Argument of peri | 154.01599 |
| Geometric albedo | 0.0901 |
| Absolute magnitude (H) | 10.50 |
3631 Sigyn (1987 BV1) is a main-belt asteroid discovered on January 25, 1987 by E. W. Elst at La Silla.
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