Laomedeia, also known as Neptune XII, is a prograde irregular satellite of the planet Neptune. Here is some information about Laomedeia:

Discovery: Laomedeia was discovered on August 13, 2002, by Matthew J. Holman, John J. Kavelaars, and Dan Milisavljevic. Prior to its official naming, it was designated as S/2002 N 3.

Name: The moon was officially named Laomedeia on February 3, 2007. It is named after Laomedeia, a Nereid in Greek mythology who was one of the fifty daughters of the sea god Nereus and the nymph Doris.

Orbit: Laomedeia orbits Neptune in a prograde direction, which means it travels in the same direction as Neptune's rotation. It has an irregular orbit, indicating that it does not follow a regular, circular path.

Orbital Period: The orbital period of Laomedeia, which is the time it takes to complete one orbit around Neptune, is approximately 3,171 days (or about 8.7 Earth years).

Physical Characteristics: The exact physical characteristics of Laomedeia, such as its size, shape, and surface features, may not be well-known. However, its radius is estimated to be around 13.049 miles (21 kilometers).

Density: The density of Laomedeia is reported to be around 1.5 grams per cubic centimeter (g/cm³). This suggests that it is likely composed of a mixture of rock and ice.