Neso is a moon of Neptune, part of the Solar System in the universe. Neptune is a planet associated with the Sun, our star, and this space encyclopedia describes the moon’s identity and place in its planetary system.

Neso — A natural satellite of Neptune. Its physical properties and orbital motion are shown from the available catalogue and ephemeris data.

No object-specific chemical/elemental dataset has been verified and imported for this record. This does not mean none is publicly available. Appearance may be imagined; chemistry is not.

Discovery and designation
Neso was discovered in 2002. JPL credits M. Holman, J. Kavelaars, T. Grav, W. Fraser, D. Milisavljevic. Its provisional designation is S/2002 N4. The name and discovery entry identify this particular satellite of Neptune; similarly named asteroids are separate objects.

Neso was discovered in 2002 by Matthew J. Holman, John J. Kavelaars, Tommy Grav, Wesley C. Fraser, and Dan Milisavljevic using the 4-m Blanco telescope at Cerro Tololo Observatory in Chile.

Very little is known about Neso, another of Neptune's extremely distant irregular moons. Neso's eccentric orbit takes it millions of miles from the ice giant. The moon's orbit is among the most distant from its planet than any other known moon in our solar system.

The small moon shares similar orbital parameters with another moon of Neptune―Psamathe. Both Neso and Psamathe may be fragments from the break-up of a larger moon billions of years ago.

Neso like many of the outer satellites of Neptune, is named after one of the Nereids. Neso was originally designated S/2002 N 4.