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Neptune, moons





Neptune has 14 known moons. All of the small, irregular moons that lie beyond Nereid have been discovered since 2002. See also Neptune Trojan.


moon orbit semimajor
axis (km)
orbital
period (d)
eccentricity orb. incl.
(º)
diameter
(km)
Naiad 48,227 0.294 0.0003 4.691 96 × 60 × 52
Thalassa 50,074 0.311 0.0002 0.135 108 × 100 × 52
Despina 52,526 0.335 0.0002 0.068 180 × 148 × 128
Galatea 61,953 0.429 0.0001 0.034 204 × 184 × 144
Larissa 73,548 0.555 0.0014 0.205 216 × 204 × 168
68S/2004 N1 105,300 0.936 0.0000 0.000 16–20
Proteus 117,646 1.122 0.0005 0.075 436 × 416 × 402
Triton 354,749 5.877R 0.0000 156.865 2,705
Nereid 5,513,818 360.13 0.7507 7.090 340
Halimede 16,611,000 1879.1 0.2646 112.898 62
Sao 22,228,000 2912.7 0.1365 49.907 44
Laomedeia 23,567,000 3171.3 0.3969 34.049 42
Psamathe 48,096,000 9074.3R 0.3809 137.679 40
Neso 49,285,000 9740.3R 0.5714 131.265 60


Related category

   • PLANETS AND MOONS