NGC 643
Due to their close proximity to NGC 643 , the open cluster ESO 29-SC44 and the galaxies PGC 6117 and PGC 6256 are also designated NGC 643A , NGC 643B and NGC 643C , respectively . 
<triplet> NGC 643 <subj> galaxies <obj> instance of <triplet> NGC 643 <subj> galaxies <obj> instance of <triplet> NGC 643 <subj> galaxies <obj> instance of <triplet> NGC 643 <subj> galaxies <obj> instance of