Robert Sutton Harrington
Another astronomer there , James W . Christy , consulted with him after discovering bulges in the images of Pluto , which turned out to be Pluto's satellite Charon . 
<triplet> Pluto <subj> Charon <obj> child astronomical body <triplet> Charon <subj> Pluto <obj> parent astronomical body <subj> satellite <obj> instance of