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Discovery and designation
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| Discovered by | Henri Debehogne |
| Discovery site | La Silla |
| Discovery date | January 16, 1988 |
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Designations
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| MPC designation | 4218 |
| Alternate name(s) | 1988 BK3 |
| Epoch May 14, 2008 | |
| Ap | 2.5717286 |
| Peri | 1.9229768 |
| Eccentricity | 0.1443369 |
| Orbital period | 1230.5670391 |
| Mean anomaly | 273.62507 |
| Inclination | 4.89782 |
| Longitude of ascending node | 209.72399 |
| Argument of peri | 37.11988 |
| Absolute magnitude (H) | 14.1 |
4218 Demottoni (1988 BK3) is a main-belt asteroid discovered on January 16, 1988 by Henri Debehogne at La Silla.
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