| Proper Name | Styx | | Primary Planet | Pluto | | Family / Class | Not applicable | | Orbital Period | 20 days, 4 hours | | Distance from Pluto | Semi-Major Axis: 42,393 km
Periapsis: 42,148 km
Apoapsis: 42,638 km | | Eccentricity | 0.0058 | | Rotation Period | Mean 3 days, 6 hours (chaotic) | | Mean Diameter | 11 km (7 miles); longest axis 16 km (10 miles) | | Notes | Styx is a small moon with an elongated shape, being some 16 km along its longest axis, but with an average diameter of only about 9 km in cross section. The moon is thought to be composed largely of water ice, and probably originated in an ancient collision between Pluto and another object. |
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