Table
| ‡ Prograde irregular moons |
♠ Retrograde irregular moons |
The Neptunian moons are listed here by orbital period, from shortest to longest. Irregular (captured) moons are marked by color.
| Order |
Label |
Name | Pronunciation |
Image | Diameter (km) |
Mass (×1016 kg) |
Semi-major axis (km) |
Orbital period (d) |
Inclination (°) |
Eccentricity |
Discovery year |
Discoverer |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 03 !Neptune III | Naiad | ˈneɪ.əd | 0066 !66 (96 × 60 × 52) |
0000019 !19 | 48,227 | 0.294 | 4.691 | 0.0003 | 1989 | Voyager Science Team | |
| 2 | 04 !Neptune IV | Thalassa | θəˈlæsə | 0082 !82 (108 × 100 × 52) |
0000035 !35 | 50,074 | 0.311 | 0.135 | 0.0002 | 1989 | Voyager Science Team | |
| 3 | 05 !Neptune V | Despina | dɨsˈpiːnə | 0150 !150 (180 × 148 × 128) |
0000210 !210 | 52,526 | 0.335 | 0.068 | 0.0002 | 1989 | Voyager Science Team | |
| 4 | 06 !Neptune VI | Galatea | ˌɡæləˈtiːə | 0176 !176 (204 × 184 × 144) |
0000375 !375 | 61,953 | 0.429 | 0.034 | 0.0001 | 1989 | Voyager Science Team | |
| 5 | 07 !Neptune VII | Larissa | ləˈrɪsə | 0194 !194 (216 × 204 × 168) |
0000495 !495 | 73,548 | 0.555 | 0.205 | 0.0014 | 1981 | H. Reitsema, W. Hubbard, L. Lebofsky, and D. J. Tholen | |
| 6 | 08 !Neptune VIII | Proteus | ˈproʊtiəs | 0420 !420 (436 × 416 × 402) |
0005035 !5,035 | 117,646 | 1.122 | 0.075 | 0.0005 | 1989 | Voyager Science Team | |
| 7 | 01 !Neptune I | Triton♠ | ˈtraɪtən | 2705 !2,705.2 ± 4.8 (2,709 × 2,706 × 2,705) |
2,140,000 !2,140,800 ± 5200 |
354,759 | 5.877 | 156.865 | 0.0000 | 1846 | W. Lassell | |
| 8 | 02 !Neptune II | Nereid‡ | ˈnɪəriː.ɪd | 0340 !340 ± 50 | 0002700 !2,700 | 5,513,818 | 360.13 | 7.090 | 0.7507 | 1949 | G.P. Kuiper | |
| 9 | 09 !Neptune IX | Halimede♠ | ˌhælɨˈmiːdiː | 0062 !~62 | 0000016 !16 | 16,611,000 | 1,879.08 | 112.712 | 0.2646 | 2002 | M. Holman, J. Kavelaars, T. Grav, W. Fraser, and D. Milisavljevic | |
| 10 | 11 !Neptune XI | Sao‡ | ˈseɪ.oʊ | 0044 !~44 | 0000006 !6 | 22,228,000 | 2,912.72 | 53.483 | 0.1365 | 2002 | M. Holman, J. Kavelaars, T. Grav, W. Fraser, and D. Milisavljevic | |
| 11 | 12 !Neptune XII | Laomedeia‡ | ˌleɪ.ɵmɨˈdiːə | 0042 !~42 | 0000005 !5 | 23,567,000 | 3,171.33 | 37.874 | 0.3969 | 2002 | M. Holman, J. Kavelaars, T. Grav, W. Fraser, and D. Milisavljevic | |
| 12 | 10 !Neptune X | Psamathe♠ | ˈsæməθiː | 0040 !~40 | 0000004 !4 | 48,096,000 | 9,074.30 | 126.312 | 0.3809 | 2003 | S.S. Sheppard, D.C. Jewitt, and J. Kleyna | |
| 13 | 13 !Neptune XIII | Neso♠ | ˈniːsoʊ | 0060 !~60 | 0000015 !15 | 49,285,000 | 9,740.73 | 136.439 | 0.5714 | 2002 | M. Holman, J. Kavelaars, T. Grav, W. Fraser, and D. Milisavljevic |
Read more about this topic: Moons Of Neptune
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