[WarMachine]

Peter -- Rockballs (like our moon) and iceballs (like Saturn's Mimas) should be relatively common. Luna is a bit odd, because it is so large in relation to Earth, but both Jupiter and Saturn are jammed with more than a Baker's Dozen each -- more like two dozen.

For Cyrannus? This is strictly a WAG, but there are probably one or two moons orbiting each of the stand-alone Colonies, and likely 10-15 rock-/iceballs each around the two gas giants.