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Discovery and designation
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| Discovered by | Lincoln Laboratory Near-Earth Asteroid Research Team |
| Discovery site | Socorro |
| Discovery date | April 21, 1998 |
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Designations
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| MPC designation | 15421 |
| Alternate name(s) | 1998 HM81 |
| Epoch May 14, 2008 | |
| Ap | 3.1054809 |
| Peri | 2.6729357 |
| Eccentricity | 0.0748553 |
| Orbital period | 1793.7697891 |
| Mean anomaly | 259.18333 |
| Inclination | 2.78195 |
| Longitude of ascending node | 55.93719 |
| Argument of peri | 281.96088 |
| Absolute magnitude (H) | 14.4 |
15421 Adammalin (1998 HM81) is a main-belt asteroid discovered on April 21, 1998 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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