Named in honor of Mutsumi Ishitsuka (b. 1930), who has worked in Peru since 1957, making coronagraphic observations of the sun at high altitude. In 1979 he built the Cosmos Observatory and in 1988 set up a new coronagraph there that was destroyed by a group of guerrillas. He is currently trying to reconstruct the observatory and to establish a Peruvian National Observatory for teaching astronomy. Name proposed by the discoverers following a suggestion by T. Kuroda and Y. Yamada.