Neptune's Major Satellites

		Diameter		Mean distance from Neptune
Satellite	Year of discovery	km	mi	km	mi

Triton	1846	2,700	1,678	355,000	221,000
Nereid	1949	340	211	5,513,000	3,426,000
Despina	1989	180	112	53,000	33,000
Galatea	1989	150	93	62,000	39,000
Larissa	1989	190	118	74,000	46,000
Naiad	1989	50	31	48,000	30,000
Proteus	1989	400	249	118,000	73,000
Thalassa	1989	80	50	50,000	31,000