The Plutonian Moons are moons of Pluto discovered 1978 ,2005 , and recently , in 2011 July 20,2011. Charon is the largest with 720 mi in size ( 1,207 km ).
Hydra is the second largest with in between a size of 61 and 167 km. The next largest is Nix with a size in between 46 and 137 km. P4 is between 13 and 34 km.