I think solar/star system should be a star with its planets and planet system should be that of i.e. Jupiter, Europa, Io and so forth. A moon system should be something that hasn't been found but what i believe exists though rarely to be found - a moon with some items around it. Imagine a star with a planet at 13.9M_jup (or whatever the exact definition of a maximized planet is) with a moon at say 1M_earth, which then had an astroide around it at for instance 1M_moon. That would be a moon system in my eyes. Those are teoretically realistic, right?

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