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Proteus
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Proteus

astronomy
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Proteus is a moon of Neptune, discovered in 1989 by the Voyager 2 spacecraft. It is Neptune's second-largest moon, with a diameter of approximately 420 km (260 miles). Proteus has an irregular shape and a heavily cratered surface, suggesting it has undergone significant impacts throughout its history. Its orbit is close to Neptune's equatorial plane, and it is likely in synchronous rotation, meaning its rotation period matches its orbital period. Proteus is named after a Greek sea god known for his ability to change shape, reflecting the moon's irregular form.123

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3 Britannica Sources
  1. Neptune - Moons
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  3. Proteus

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