Nereid

Also known as Neptune II

large moon of Neptune

AI overview

Nereid is a large moon that orbits Neptune, the eighth planet from the Sun in our solar system. It's notable for having one of the most unusual and elongated orbits of any moon in the solar system, which makes it interesting to scientists studying planetary systems.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

Diameter: 357
Radius: 170
Mass: 31
Orbital period: 360.11
Image: Nereid-Voyager2.jpg

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time of discovery or invention: 1949-05-01
Commons gallery: Nereid
Commons category: Nereid (moon)
albedo: 0.155
orbital eccentricity: 0.7512
semi-major axis of an orbit: 5513400
orbital inclination: 504.909
longitude of ascending node: 326.0
argument of periapsis: 290.3
density: 1.5
rotation period: 11.594
mean anomaly: 318.0
absolute magnitude: 4.4
temperature: 50
flattening: 0.23
surface gravity: 0.075
apparent magnitude: 19.2

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Article

Nereid, or Neptune II, is the third-largest moon of Neptune. It has the second-most eccentric orbit of all known moons in the Solar System, after S/2023 S 38. It was the second moon of Neptune to be discovered, by Gerard Kuiper in 1949.

Discovery and naming