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Discovery and designation
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| Discovered by | H. Debehogne |
| Discovery site | European Southern Observatory |
| Discovery date | January 20, 1988 |
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Designations
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| MPC designation | 3866 |
| Named after | Samuel Pierpont Langley |
| Alternate name(s) | 1988 BH4 |
| Epoch May 14, 2008 | |
| Ap | 3.7442561 |
| Peri | 2.5450913 |
| Eccentricity | 0.1906660 |
| Orbital period | 2036.8629188 |
| Mean anomaly | 12.67817 |
| Inclination | 3.60898 |
| Longitude of ascending node | 222.85610 |
| Argument of peri | 122.43330 |
| Absolute magnitude (H) | 12.2 |
3866 Langley (1988 BH4) is a main-belt asteroid discovered on January 20, 1988 by H. Debehogne at the European Southern Observatory.
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