DeLisle Stewart
In 1896 he became a staff member of Harvard College Observatory , and from 1898 to 1901 he worked at that observatory's station at Arequipa , Peru , where he took the photographic plates that William Henry Pickering used to discover Saturn's moon Phoebe . 
<triplet> Arequipa <subj> Peru <obj> country <triplet> Saturn <subj> Phoebe <obj> child astronomical body <triplet> Phoebe <subj> Saturn <obj> parent astronomical body