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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 | 20335 |
| Alternate name(s) | 1998 HK57 |
| Epoch May 14, 2008 | |
| Ap | 2.5736000 |
| Peri | 2.4481708 |
| Eccentricity | 0.0249771 |
| Orbital period | 1453.2446978 |
| Mean anomaly | 306.57011 |
| Inclination | 2.84208 |
| Longitude of ascending node | 207.76459 |
| Argument of peri | 241.75047 |
| Absolute magnitude (H) | 15.3 |
20335 Charmartell (1998 HK57) 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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