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Proteus

Neptune VIII

Moon of Neptune

Proper NameProteus
DesignationNeptune VIII
Primary PlanetNeptune
Orbital Period26 hours, 56 minutes
Distance from NeptuneSemi-Major Axis: 117,647 km
Periapsis: 117,585 km
Apoapsis: 117,709 km
Eccentricity0.0005
Rotation Period26 hours, 56 minutes (synchronous orbit)
Mean Diameter403 km
251 miles
NotesThe second largest of Neptune's moons after Triton, and probably formed during the capture of that large moon by Neptune.

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