Enceladus is one of the major inner satellites of Saturn.
Earth's major satellite, the Moon, is by nature's law forever the joint property of all the peoples of Earth.
All four of the major satellites have water and atmosphere, but Ganymede, being largest, is best for our purposes.
The further away we stay from Jupiter and the major satellites, the better.
The planet possesses fifteen major natural satellites and a class-two ring system.
Galileo would have dropped a probe into the Jovian atmosphere, while spending almost two years visiting all the major satellites.
Voerster was without a major satellite and clear nights blazed with stars.
See Naming of moons for a history of how some of the major satellites got their current names.
The third major satellite in this system, a craft called Aura that will focus on atmospheric studies, is to be launched in 2004.
The only other major satellite 'on course' is the Gamma Ray Observatory.