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Discovery and designation
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| Discovered by | Henri Debehogne |
| Discovery site | European Southern Observatory |
| Discovery date | February 21, 1987 |
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Designations
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| MPC designation | 4210 |
| Alternate name(s) | 1987 DY5 |
| Epoch May 14, 2008 | |
| Ap | 3.2313989 |
| Peri | 2.7408889 |
| Eccentricity | 0.0821310 |
| Orbital period | 1884.7967218 |
| Mean anomaly | 92.34037 |
| Inclination | 10.45578 |
| Longitude of ascending node | 160.03569 |
| Argument of peri | 286.97204 |
| Absolute magnitude (H) | 11.9 |
4210 Isobelthompson (1987 DY5) is a main-belt asteroid discovered on February 21, 1987 by Henri Debehogne at the European Southern Observatory.
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