Neptune's moon Proteus measures 420 kilometers in diameter. This moon is shaped like a sphere, has many craters, and is neutral in color.

In what year was the moon called Proteus discovered?

real answer is.....

Answer: Discovered by Voyager 2 spacecraft in 1989, it is named after Proteus, the shape-changing sea god of Greek mythology. Proteus circles Neptune in a nearly equatorial orbit at the distance of about 4.75 equatorial radii of the planet.

Neptunes largest moon is called Triton. Proteus is one of the 13 other moons, which are much smaller.

Naiad, Thalass, Galatea, Larisaa, Proteus, Triton, Nereid, Halimede, Sao, Laomedeia, Psamathe, and Neso.

Hypsoblennius proteus was created in 1960.