eptune 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).
