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S/2002 N 4 is a natural satellite of Neptune. It was discovered by Matthew J. Holman, et al. and Brett J. Gladman, et al. in 2003 from pictures taken in 2002. It orbits Neptune at a distance of about 48,837,000 km, making it the most distant known moon of any planet. S/2002 N 4 is about 60 kilometers in diameter.
| Neptune |
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| Naiad | Thalassa | Despina | Galatea | Larissa | Proteus | Triton |
| Nereid | S/2002 N 1's group | S/2002 N 2's group | S/2002 N 4's group |
| (For other moons, see: Neptune's natural satellites) |