クライド・トンボー
Due to merest chance, Humason missed discovering Pluto. Eleven years before Clyde Tombaugh, Humason took a set of four photographs in which the image of Pluto appeared. There is persistent speculation that he missed discovering the dwarf planet because it fell on a defect in the photographic plate. This is unlikely, however, given that it appeared in four separate photographs over three different nights.