Confirmed moons[]
This is a list of the 14 known moons of Neptune in order of orbital distance
| Order | Label | Name | Diameter (km) | Semi-major
axis (km) |
Discovery Year | Discoverer(s) |
|---|---|---|---|---|---|---|
| 1 | III | Naiad | 66 | 48,224 | 1989 | Voyager Science Team |
| 2 | IV | Thalassa | 82 | 50,074 | 1989 | Voyager Science Team |
| 3 | V | Despina | 156 | 52,526 | 1989 | Voyager Science Team |
| 4 | VI | Galatea | 176 | 61,953 | 1989 | Voyager Science Team |
| 5 | VII | Larissa | 194 | 73,548 | 1981 | Harold Reitesma |
| 6 | XIV | Hippocamp | 34.8 | 105,283 | 2013 | Mark Showalter |
| 7 | VIII | Proteus | 420 | 117,646 | 1989 | Voyager Science Team |
| 8 | I | Triton | 2,706.8 | 354,759 | 1846 | William Lassell |
| 9 | II | Nereid | 340 | 5,514,100 | 1949 | Gerard Kuiper |
| 10 | IX | Halimede | 62 | 16,599,700 | 2002 | Matthew Homan |
| 11 | XI | Sao | 44 | 22,274,600 | 2002 | Matthew Holman |
| 12 | XII | Laomedeia | 42 | 23,565,400 | 2002 | Matthew Holman |
| 13 | X | Psamathe | 40 | 46,417,700 | 2003 | Scott Sheppard |
| 14 | XIII | Neso | 60 | 48,888,000 | 2002 | Matthew Holman |
Unconfirmed moons[]
Neptune has 1 unconfirmed moon that was only observed in August and September 2002 before being lost.
| Name | Diameter (km) | Observed Distance (km) | Discovery Year | Discoverer |
|---|---|---|---|---|
| c02N4 | 33 | 25,100,000 | 2002 | Matthew Holman |