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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 | 20341 |
| Alternate name(s) | 1998 HX91 |
| Epoch May 14, 2008 | |
| Ap | 2.6043312 |
| Peri | 2.2301326 |
| Eccentricity | 0.0774023 |
| Orbital period | 1372.7008167 |
| Mean anomaly | 63.06790 |
| Inclination | 5.09179 |
| Longitude of ascending node | 168.68305 |
| Argument of peri | 228.54096 |
| Absolute magnitude (H) | 14.3 |
20341 Alanstack (1998 HX91) is a main belt asteroid discovered on April 21, 1998 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Named for Alan Stack, the teacher-advisor of several Intel Science Talent Search finalists from Midwood High School at Brooklyn College.
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