Wikipedia
Psamathe (Greek: Ψάμαθη, from ψάμαθος "sand of the sea-shore") was a Nereid in Greek mythology, i.e., one of the fifty daughters of Nereus and Doris. The goddess of sand beaches, Psamathe was the wife of Proteus and the mother of Phocus by Aeacus.
Some translations of Ovid have the name as Psamanthe.
Psamathe ( ; Latin: Psamathē; Greek: Ψαμάθη), also known as Neptune X, is a retrograde irregular satellite of Neptune. It is named after Psamathe, one of the Nereids. Psamathe was discovered by Scott S. Sheppard and David C. Jewitt in 2003 using the 8.2 meter Subaru telescope. Before the announcement of its name on February 3, 2007 (IAUC 8802 ), it was known by the provisional designation S/2003 N 1.
Psamathe is about 38 kilometers in diameter. It orbits Neptune at a distance of between 25.7 and 67.7 million km (for comparison, the Sun- Mercury distance varies between 46 million and 69.8 million km) and requires almost 25 Earth years to make one orbit. The orbit of this satellite is close to the theoretical stable separation from Neptune for a body in a retrograde orbit. Given the similarity of Psamathe's orbital parameters with Neso (S/2002 N 4), it was suggested that both irregular satellites could have a common origin in the break-up of a larger moon. Both are further from their primary than any other known moon in the Solar System.
Psamathe was the daughter of Crotopus, king of Argos. She was mortal mother of Linus by Apollo. Fearing her father she gave Linus to shepherds to be raised; after reaching adulthood, he was torn apart by the shepherd's dogs, and Psamathe was killed by her father, who would not believe that she had had intercourse with a god rather than a mortal. Apollo avenged her murder by sending a child-killing plague to Argos, which would not cease until the Argives, at the god's command, paid honors to Psamathe and Linus. In an alternate version, the baby Linus was torn apart by the king's sheepdogs upon being exposed and Apollo sent Poene, the personification of punishment, upon the city. Poene would steal children from their mothers until Coroebus killed her.