| Minorplanet: | yes |
| Background: |
|
| Xanthus | |
| Discoverer: | Henry Holt and Norman G. Thomas |
| Discovery Site: | Palomar Observatory |
| Discovered: | 31 March 1989 |
| Mpc Name: | (4544) Xanthus |
| Alt Names: | 1989 FB |
| Mp Category: | Near-Earth object Apollo |
| Epoch: | 13 January 2016 (JD 2457400.5) |
| Aphelion: | 1.3023abbr=onNaNabbr=on |
| Perihelion: | 0.7812AU |
| Semimajor: | 1.0418AU |
| Eccentricity: | 0.25012 |
| Period: | 1.06 yr (388.38 d) |
| Inclination: | 14.146° |
| Asc Node: | 24.00998° |
| Mean Anomaly: | 269.26925° |
| Arg Peri: | 333.75° |
| Dimensions: | 1.3 km |
| Abs Magnitude: | 17.1 |
| Mean Motion: | / day |
| Rotation: | 37.65abbr=onNaNabbr=on |
| Mean Radius: | 0.65 km |
| Observation Arc: | 7629 days (20.89 yr) |
| Uncertainty: | 0 |
| Moid: | 0.173705AU |
4544 Xanthus, provisional designation, is an asteroid, classified as near-Earth object of the Apollo group, approximately 1.3 kilometers in diameter. It was discovered on 31 March 1989, by astronomers Henry Holt and Norman Thomas at the Palomar Observatory in California.