21621 Sherman
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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 | May 20, 1999 |
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Designations
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| MPC designation | 21621 |
| Alternative names[1] | 1999 KR4 |
| Epoch May 14, 2008 | |
| Ap | 3.0177482 |
| Peri | 1.7734850 |
| Eccentricity | 0.2596958 |
| Orbital period | 1354.3297074 |
| Mean anomaly | 131.26305 |
| Inclination | 8.69722 |
| Longitude of ascending node | 209.45792 |
| Argument of peri | 114.63589 |
| Absolute magnitude | 14.5 |
21621 Sherman (1999 KR4) is a Main-belt Asteroid discovered on May 20, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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