<Tr> <Td> Prograde irregular moons </Td> <Td> Retrograde irregular moons </Td> </Tr> <P> The Neptunian moons are listed here by orbital period, from shortest to longest . Irregular (captured) moons are marked by color . Triton, the only Neptunian moon massive enough for its surface to have collapsed into a spheroid, is bolded . </P> <Table> Neptunian moons <Tr> <Th> Order </Th> <Th> Label </Th> <Th> Name </Th> <Th> Pronunciation (key) </Th> <Th> Image </Th> <Th> Diameter (km) </Th> <Th> Mass (× 10 kg) </Th> <Th> Semi-major axis (km) </Th> <Th> Orbital period (d) </Th> <Th> Orbital inclination (°) </Th> <Th> Eccentricity </Th> <Th> Discovery year </Th> <Th> Discoverer </Th> </Tr> <Tr> <Td> </Td> <Td> 03! III </Td> <Td> Naiad </Td> <Td> / ˈneɪæd, ˈnaɪ -, - əd / </Td> <Td> </Td> <Td> 0066! 66 (96 × 60 × 52) </Td> <Td> 0000019! ≈ 19 </Td> <Td> 7004482270000000000 ♠ 48 227 </Td> <Td> 0.294 </Td> <Td> 4.691 </Td> <Td> 0.0003 </Td> <Td> 1989 </Td> <Td> Voyager Science Team </Td> </Tr> <Tr> <Td> </Td> <Td> 04! IV </Td> <Td> Thalassa </Td> <Td> / θəˈlæsə / </Td> <Td> </Td> <Td> 0082! 82 (108 × 100 × 52) </Td> <Td> 0000035! ≈ 35 </Td> <Td> 7004500740000000000 ♠ 50 074 </Td> <Td> 0.311 </Td> <Td> 0.135 </Td> <Td> 0.0002 </Td> <Td> 1989 </Td> <Td> Voyager Science Team </Td> </Tr> <Tr> <Td> </Td> <Td> 05! V </Td> <Td> Despina </Td> <Td> / dɪsˈpiːnə / </Td> <Td> </Td> <Td> 0150! 150 (180 × 148 × 128) </Td> <Td> 0000210! ≈ 210 </Td> <Td> 7004525260000000000 ♠ 52 526 </Td> <Td> 0.335 </Td> <Td> 0.068 </Td> <Td> 0.0002 </Td> <Td> 1989 </Td> <Td> Voyager Science Team </Td> </Tr> <Tr> <Td> </Td> <Td> 06! VI </Td> <Td> Galatea </Td> <Td> / ˌɡæləˈtiːə / </Td> <Td> </Td> <Td> 0176! 176 (204 × 184 × 144) </Td> <Td> 0000375! ≈ 375 </Td> <Td> 7004619530000000000 ♠ 61 953 </Td> <Td> 0.429 </Td> <Td> 0.034 </Td> <Td> 0.0001 </Td> <Td> 1989 </Td> <Td> Voyager Science Team </Td> </Tr> <Tr> <Td> 5 </Td> <Td> 07! VII </Td> <Td> Larissa </Td> <Td> / ləˈrɪsə / </Td> <Td> </Td> <Td> 0194! 194 (216 × 204 × 168) </Td> <Td> 0000495! ≈ 495 </Td> <Td> 7004735480000000000 ♠ 73 548 </Td> <Td> 0.555 </Td> <Td> 0.205 </Td> <Td> 0.0014 </Td> <Td> 1981 </Td> <Td> Reitsema et al . </Td> </Tr> <Tr> <Td> 6 </Td> <Td> 14!--</Td> <Td> S / 2004 N 1 </Td> <Td> </Td> <Td> </Td> <Td> 0018! ≈ 16--20 </Td> <Td> 0000000.5! ≈ 0.5 ± 0.4 </Td> <Td> 7005105300000000000 ♠ 105 300 ± 50 </Td> <Td> 0.936 </Td> <Td> 0.000 </Td> <Td> 0.0000 </Td> <Td> 2013 </Td> <Td> Showalter et al . </Td> </Tr> <Tr> <Td> 7 </Td> <Td> 08! VIII </Td> <Td> Proteus </Td> <Td> / ˈproʊtiəs / </Td> <Td> </Td> <Td> 0420! 420 (436 × 416 × 402) </Td> <Td> 0005035! ≈ 7003503500000000000 ♠ 5035 </Td> <Td> 7005117646000000000 ♠ 117 646 </Td> <Td> 1.122 </Td> <Td> 0.075 </Td> <Td> 0.0005 </Td> <Td> 1989 </Td> <Td> Voyager Science Team </Td> </Tr> <Tr> <Td> 8 </Td> <Td> 01! I </Td> <Td> Triton </Td> <Td> / ˈtraɪtən / </Td> <Td> </Td> <Td> 2705! 7003270519999999999 ♠ 2705. 2 ± 4.8 (7003270900000000000 ♠ 2709 × 7003270600000000000 ♠ 2706 × 7003270500000000000 ♠ 2705) </Td> <Td> 2,140,000! 7006214080000000000 ♠ 2140800 ± 5200 </Td> <Td> 7005354759000000000 ♠ 354 759 </Td> <Td> − 5.877 </Td> <Td> 156.865 </Td> <Td> 0.0000 </Td> <Td> 1846 </Td> <Td> Lassell </Td> </Tr> <Tr> <Td> 9 </Td> <Td> 02! II </Td> <Td> Nereid </Td> <Td> / ˈnɪəriːɪd / </Td> <Td> </Td> <Td> 0340! ≈ 340 ± 50 </Td> <Td> 0002700! ≈ 7003270000000000000 ♠ 2700 </Td> <Td> 7006551381800000000 ♠ 5513818 </Td> <Td> 360.13 </Td> <Td> 7.090 </Td> <Td> 0.7507 </Td> <Td> 1949 </Td> <Td> Kuiper </Td> </Tr> <Tr> <Td> 10 </Td> <Td> 09! IX </Td> <Td> Halimede </Td> <Td> / ˌhælɪˈmiːdiː / </Td> <Td> </Td> <Td> 0062! ≈ 62 </Td> <Td> 0000016! ≈ 16 </Td> <Td> 7007166110000000000 ♠ 16 611 000 </Td> <Td> 2996812092000000000 ♠ − 1879. 08 </Td> <Td> 112.898 </Td> <Td> 0.2646 </Td> <Td> 2002 </Td> <Td> Holman et al . </Td> </Tr> <Tr> <Td> 11 </Td> <Td> 11! XI </Td> <Td> Sao </Td> <Td> / ˈseɪoʊ / </Td> <Td> </Td> <Td> 0044! ≈ 44 </Td> <Td> 0000006! ≈ 6 </Td> <Td> 7007222280000000000 ♠ 22 228 000 </Td> <Td> 7003291272000000000 ♠ 2912. 72 </Td> <Td> 49.907 </Td> <Td> 0.1365 </Td> <Td> 2002 </Td> <Td> Holman et al . </Td> </Tr> <Tr> <Td> 12 </Td> <Td> 12! XII </Td> <Td> Laomedeia </Td> <Td> / ˌleɪoʊmɪˈdiːə / </Td> <Td> </Td> <Td> 0042! ≈ 42 </Td> <Td> 0000005! ≈ 5 </Td> <Td> 7007235670000000000 ♠ 23 567 000 </Td> <Td> 7003317133000000000 ♠ 3171. 33 </Td> <Td> 34.049 </Td> <Td> 0.3969 </Td> <Td> 2002 </Td> <Td> Holman et al . </Td> </Tr> <Tr> <Td> 13 </Td> <Td> 10! X </Td> <Td> Psamathe </Td> <Td> / ˈsæməθiː / </Td> <Td> </Td> <Td> 0040! ≈ 40 </Td> <Td> 0000004! ≈ 4 </Td> <Td> 7007480960000000000 ♠ 48 096 000 </Td> <Td> 2996092570000000000 ♠ − 9074. 30 </Td> <Td> 137.679 </Td> <Td> 0.3809 </Td> <Td> 2003 </Td> <Td> Sheppard et al . </Td> </Tr> <Tr> <Td> 14 </Td> <Td> 13! XIII </Td> <Td> Neso </Td> <Td> / ˈniːsoʊ / </Td> <Td> </Td> <Td> 0060! ≈ 60 </Td> <Td> 0000015! ≈ 15 </Td> <Td> 7007492850000000000 ♠ 49 285 000 </Td> <Td> 2996025927000000000 ♠ − 9740. 73 </Td> <Td> 131.265 </Td> <Td> 0.5714 </Td> <Td> 2002 </Td> <Td> Holman et al . </Td> </Tr> </Table> <Tr> <Th> Order </Th> <Th> Label </Th> <Th> Name </Th> <Th> Pronunciation (key) </Th> <Th> Image </Th> <Th> Diameter (km) </Th> <Th> Mass (× 10 kg) </Th> <Th> Semi-major axis (km) </Th> <Th> Orbital period (d) </Th> <Th> Orbital inclination (°) </Th> <Th> Eccentricity </Th> <Th> Discovery year </Th> <Th> Discoverer </Th> </Tr>

List of the names of neptune's moons
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