The planet Neptune has 13 satellites, or moons. The largest is Triton, which was discovered by amateur astronomer William Lassell on October 10, 1846, just 17 days after German astronomers discovered Neptune, according to NASA.
Neptune takes it name from the Roman sea god, and its moons take their names from some of the lesser gods from the sea, as well as nymphs in the Greek pantheon. In addition to Triton, the other 12 moons are Nereid, Naiad, Despina, Thalassa, Larissa, Galatea, Proteus, Sao, Neso, Laomedeia, Psamanthe and Halimede. Scientists did not discover Proteus or five of the other moons until the fly-by from Voyager 2. The most recently discovered moons came to light in 2002 and 2003, thanks to improvements in telescope technology as stated by NASA.