21648 Gravanschaik
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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 | July 12, 1999 |
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Designations
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| MPC designation | 21648 |
| Alternative names[1] | 1999 NB57 |
| Epoch May 14, 2008 | |
| Ap | 3.1990659 |
| Peri | 1.9989547 |
| Eccentricity | 0.2308785 |
| Orbital period | 1530.4193158 |
| Mean anomaly | 315.72655 |
| Inclination | 11.54302 |
| Longitude of ascending node | 260.94686 |
| Argument of peri | 177.95894 |
| Absolute magnitude | 14.4 |
21648 Gravanschaik (1999 NB57) is a Main-belt Asteroid discovered on July 12, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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