Neptune has 13 known moons; 7 small named ones and Triton plus four discovered in 2002 and one discovered in 2003 which have yet to be named.

	Distance	Radius	Mass
Satellite	(000 km)	(km)	(kg)	Discoverer	Date
-------------	--------------	---------	----------	---------------	---------
Naiad	48	29	?	Voyager 2	1989
Thalassa	50	40	?	Voyager 2	1989
Despina	53	74	?	Voyager 2	1989
Galatea	62	79	?	Voyager 2	1989
Larissa	74	96	?	Voyager 2	1989
Proteus	118	209	?	Voyager 2	1989
Triton	355	1350	2.14e22	Lassell	1846
Nereid	5509	170	?	Kuiper	1949

Neptune's Rings

	Distance	Width
Ring	(km)	(km)	aka
------------	--------------	-------	-----------
Diffuse	41900	15	1989N3R, Galle
Inner	53200	15	1989N2R, LeVerrier
Plateau	53200	5800	1989N4R, Lassell, Arago
Main	62930	< 50	1989N1R, Adams

(Distance is from Neptune's center to the ring's inner edge

Pluto orbits beyond the orbit of Neptune (usually). It is much smaller than any of the official planets and now classified as a "dwarf planet". Pluto is smaller than seven of the solar system's moons (the Moon, Io, Europa, Ganymede, Callisto, Titan and Triton).