Moon
Proteus
Moon of Neptune
Large moon of Neptune
Photo: Voyager 2, NASA · Public domain · Wikimedia Commons
Proteus, also known as Neptune VIII, is the second-largest moon of Neptune and the planet's largest inner satellite. Discovered by Voyager 2 in 1989, it is named after Proteus, the shape-shifting sea god in Greek mythology. Proteus is about 400 km (250 mi) in diameter and orbits Neptune in a nearly equatorial orbit at a distance of about 4.75 Neptune radii from the planet's center.
Description from Wikipedia (CC BY-SA 4.0).
Key facts
Distance
Orbits Neptune
Orbits
Neptune
Mean radius
209 km
Orbital period
1.12 days
Discovered
1989 · Stephen P. Synnott
Orbits
Neptune
