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Discovery and designation
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| Discovered by | Henry Holt and Norman G. Thomas |
| Discovery site | Palomar Observatory |
| Discovery date | March 31, 1989 |
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Designations
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| MPC designation | 4544 |
| Alternate name(s) | 1989 FB |
| Epoch May 14, 2008 | |
| Ap | 1.302359096195236 |
| Peri | .7813092519489786 |
| Eccentricity | .2500637132153599 |
| Orbital period | 388.4152969208095 |
| Mean anomaly | 194.0366902806036 |
| Inclination | 14.14493388824627 |
| Longitude of ascending node | 24.0362517447921 |
| Argument of peri | 333.7096716638313 |
| Absolute magnitude (H) | 17.1 |
4544 Xanthus (1989 FB) is an Apollo NEO discovered on March 31, 1989 by Henry Holt and Norman G. Thomas at Palomar Observatory.
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