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Proper Name	Neso
Designation	Neptune XIII
Primary Planet	Neptune
Family / Class	Retrograde irregular moons
Orbital Period	26 y ears, 244 days
Distance from Neptune	Semi-Major Axis: 50,018,000 km (0.33 AU) Periapsis: 29,811,000 km (0.20 AU) Apoapsis: 70,226,000 km (0.47 AU)
Eccentricity	0.4040
Rotation Period	Not known
Mean Diameter	60 km 37 miles
Notes	A small irregular moon of Neptune, notable for its immense distance from its primary planet. At its apoapsis - the farthest point in its orbit from Neptune - it approaches a distance greater than that of Mercury from the Sun. This makes Neso the most distant known moon of any planet in the Solar System.

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