Keeping up on the number of moon's each planet has is not easy. Astronomers find
New moons regularly as they use new telescopes and search techniques. For example, in July
2001, astronomers discovered 12 new Saturnian satellites, bringing the number of its
companions to 30, more than for any other planet in our Solar System.
Analysis of the orbits of these satellites show "orbital clustering." That is, the
moons follow paths that form three families. This suggests that they have not been
captured one-by-one, but rather are fragments of single objects that have been broken up,
probably by collision with other moons.
Which planet has the most moons is not of much interest by itself. This is partly because it turns out that it is much easier to search for new moons around Saturn than around the other outer planets. Because it is easier to search for Saturnian moons, it isn't too surprising that more are found there.