Philibert Jacques Melotte
The conspicuous star cluster in the Coma Berenices constellation is commonly designated Mel 111 since it appeared in Melotte's 1915 catalogue of star clusters , but not in Charles Messier's famous catalogue of deep sky objects or in the New General Catalogue since it was not proved to be a true cluster until 1938 by the astronomer R J Trumpler . 
<triplet> Coma Berenices <subj> constellation <obj> instance of <triplet> Mel 111 <subj> Coma Berenices <obj> constellation <triplet> Melotte's 1915 catalogue <subj> 1915 <obj> publication date <triplet> Charles Messier <subj> catalogue <obj> notable work