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Discovery and designation
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| Discovery date | , |
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Designations
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| MPC designation | 11781 |
| Named after | Alexander William Roberts |
| Alternate name(s) | 1966 PL |
| Epoch May 14, 2008 | |
| Ap | 2.6516929 |
| Peri | 2.0673259 |
| Eccentricity | 0.1238323 |
| Orbital period | 1323.8262993 |
| Mean anomaly | 206.80645 |
| Inclination | 7.31605 |
| Longitude of ascending node | 123.41619 |
| Argument of peri | 168.37218 |
| Absolute magnitude (H) | 14.1 |
11781 Alexroberts (1966 PL) is a main belt asteroid.
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