Proteus
Moon
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Proteus, also known as Neptune VIII, is the second-largest Neptunian moon, and Neptune's largest inner satellite. Discovered by Voyager 2 in 1989, it is named after Proteus, the shape-changing sea god of Greek mythology. Wikipedia
Radius: 130.49 mi
Discovered: June 16, 1989
Discoverers: Stephen P. Synnott and Bradford A. Smith
Surface gravity: ≈ 0.023–0.054 m/s2
Dimensions: 424 km × 390 km × 396 km;
Surface area: 554 200 km2
Albedo: 0.096