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Neptune: Moons and Rings |
Moons
The same year Neptune was spotted, William Lassal, an amateur English astronomer, discovered Titian, its largest moon. It was more than a century until Gerald Kupier discovered a second moon, Nereid, in 1949. And it was not 
until forty subsequent years that Voyager 2 passed by, observing six new satellites. In all, Neptune has eight moons, seven small ones and Triton, a decently sized one. In order from the planet, nearest to farthest, they are: Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, Triton, and Nereid.| Name | Distance (km) | Radius (km) | Mass (kg) | Discoverer (Date) |
| Despina | 53,000 | 74 | Unknown | Voyager 2 (1989) |
| Galatea | 62,000 | 79 | Unknown | Voyager 2 (1989) |
| Larissa | 74,000 | 96 | Unknown | Voyager 2 (1989) |
| Naiad | 48,000 | 29 | Unknown | Voyager 2 (1989) |
| Nereid | 5,509,000 | 170 | Unknown | Kuiper (1949) |
| Proteus | 118,000 | 209 | Unknown | Voyager 2 (1989) |
| Thalassa | 50,000 | 40 | Unknown | Voyager 2 (1989) |
| Triton | 355,000 | 1,350 | 21,400 Quadrillion (1015) | Lassell (1846) |