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Discovery and designation
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| Discovered by | Eric Elst |
| Discovery site | Haute-Provence Observatory |
| Discovery date | August 14, 1988 |
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Designations
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| MPC designation | 4380 |
| Alternate name(s) | 1988 PB2 |
| Epoch May 14, 2008 | |
| Ap | 3.2499291 |
| Peri | 2.8282891 |
| Eccentricity | 0.0693690 |
| Orbital period | 1935.1644648 |
| Mean anomaly | 227.45267 |
| Inclination | 9.87883 |
| Longitude of ascending node | 346.03645 |
| Argument of peri | 44.65606 |
| Absolute magnitude (H) | 11.8 |
4380 Geyer (1988 PB2) is a main-belt asteroid discovered on August 14, 1988 by Eric Elst at Haute-Provence Observatory.
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