Discovery: Neso was discovered on August 14, 2002, by astronomers Matthew J. Holman, John J. Kavelaars, Dan Milisavljevic, and Brett J. Gladman, who were using the Canada-France-Hawaii Telescope.

Orbit and Distance: Neso is an irregular moon of Neptune, meaning it has an eccentric and inclined orbit. It has the most distant orbit of any known moon in the solar system. At its farthest point, Neso is about 48.7 million kilometers (30.3 million miles) away from Neptune.

Size and Composition: The size of Neso is estimated to be about 60 kilometers (37 miles) in diameter. Its composition is likely a mixture of water ice, rocky material, and possibly some organic compounds.

Name: Neso is named after one of the Nereids, which were sea nymphs in Greek mythology. The Nereids were often associated with the sea, and the naming convention for Neptune's moons draws inspiration from the sea.

Observation Challenges: Due to its great distance from Neptune and its small size, Neso is a challenging moon to observe. It appears very faint and requires powerful telescopes to detect and study.

Other Irregular Moons: Neso belongs to a group of irregular moons of Neptune, which includes other moons such as Proteus, Larissa, and Despina. These moons have similar characteristics, such as eccentric and inclined orbits.

Neso have a retrograde orbit around Neptune. A retrograde orbit means that the moon orbits in the opposite direction to the planet's rotation. In the case of Neso, it orbits Neptune in the opposite direction of the planet's rotation, which is counterclockwise as viewed from above the planet's north pole. This retrograde motion is typical for many of the irregular moons of Neptune.