Moons

16 of 461 recognized moons · JPL/IAU registry, reviewed 2 Nov 2026

Moon / designationSystemMean diameter
NereidNeptune340 kmNaiadNeptune58 kmThalassaNeptune80 kmDespinaNeptune148 kmGalateaNeptune158 kmLarissaNeptune192 kmProteusNeptune416 kmHalimedeNeptuneSize unavailablePsamatheNeptuneSize unavailableSaoNeptuneSize unavailableLaomedeiaNeptuneSize unavailableNesoNeptuneSize unavailableHippocampNeptuneSize unavailableS/2002 N5NeptuneSize unavailableS/2021 N1NeptuneSize unavailable

Diameters use volume-equivalent mean radii, including for irregular bodies. Mean orbital elements describe an orbit; they are not live positions. Missing physical measurements remain unavailable. Pluto is a dwarf planet; its five moons are included.

Sources & measurements