Moon 18 % Moon Charon 1978 602 1520 17530 6.3872 35 % Moon 2 % Moon 15.20 Pluto radii Nix 2005 44 1 48708 24.9 Hydra 2005 36 .391 64749 38 S/2011 P4 2011 20 approx ? 59000 32.1 S/2012 P5 2012 10--25 ? 42000+/-2000 20.2+/-0.1 --------------------------------------------------------------------------------------- Because Pluto and Charon