Despina is one of the moon of Neptune

Discovery and Naming:

Despina was discovered on July 1, 1989, by the Voyager 2 spacecraft during its flyby of Neptune. It was initially designated as "S/1989 N 3" and later named after Despina, a nymph in Greek mythology who was a daughter of Poseidon, the god of the sea.

Orbital Characteristics:

Despina orbits Neptune at an average distance of approximately 52,526 kilometers (32,651 miles) from the planet's center.

It follows a prograde, nearly circular orbit around Neptune, meaning it orbits in the same direction as the planet's rotation.

The moon completes one orbit around Neptune in about 0.33 Earth days (8 hours).

Physical Features:

Despina is a small moon, with an estimated diameter of around 150 kilometers (93 miles).

Its surface is believed to be composed primarily of water ice, along with rocky material.

Despina has a relatively smooth shape, lacking prominent craters or significant geological features. It appears to have a somewhat elongated and irregular shape.

Relation to Neptune's Rings:

Despina is known to be one of the seven moons of Neptune that contribute to maintaining the stability of Neptune's narrow rings. These moons, known as shepherd moons, help confine the ring particles within specific regions through their gravitational influence.

Exploration:

Voyager 2 is the only spacecraft to have observed Despina up close during its flyby of Neptune in 1989. Limited data was collected during that encounter.