The Mimas article was wrong on the point of the adjectival form - it might be considered correct by some but it's not merely obscure, it's a neologism, unused anywhere except Wikipedia, and most importantly, unused by astronomers, or the arbiters of astronomical nomenclature, the IAU.  I feel that it is inappropriate to promote the use of a neologism in an encyclopaedia, which is supposed to be descriptive rather than prescriptive, and so I have removed the reference to the word.