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Discovery and designation
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| Discovered by | H. Debehogne |
| Discovery site | European Southern Observatory |
| Discovery date | September 6, 1985 |
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Designations
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| MPC designation | 3821 |
| Alternate name(s) | 1985 RC3 |
| Epoch May 14, 2008 | |
| Ap | 3.8446192 |
| Peri | 2.6516134 |
| Eccentricity | 0.1836458 |
| Orbital period | 2138.1874941 |
| Mean anomaly | 216.27966 |
| Inclination | 0.55199 |
| Longitude of ascending node | 113.12140 |
| Argument of peri | 338.57637 |
| Absolute magnitude (H) | 12.1 |
3821 Sonet (1985 RC3) is an outer main-belt asteroid discovered on September 6, 1985 by H. Debehogne at the European Southern Observatory.
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