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Discovery and designation
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| Discovered by | E. W. Elst |
| Discovery site | European Southern Observatory |
| Discovery date | April 10, 1991 |
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Designations
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| MPC designation | 11898 |
| Alternate name(s) | 1991 GM9 |
| Epoch May 14, 2008 | |
| Ap | 3.5931382 |
| Peri | 2.8389266 |
| Eccentricity | 0.1172581 |
| Orbital period | 2106.5853790 |
| Mean anomaly | 7.24959 |
| Inclination | 2.09774 |
| Longitude of ascending node | 129.85129 |
| Argument of peri | 45.82292 |
| Absolute magnitude (H) | 13.1 |
11898 Dedeyn (1991 GM9) is an outer main-belt asteroid discovered on April 10, 1991 by E. W. Elst at the European Southern Observatory.
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