Named in honor of Katsuhiko Sato (b. 1945), professor at University of Tokyo and director of the Research Center of the Early Universe since 1995. He is an active leader in cosmology research and served as president of IAU Commission 47 during 1988-1991. He proposed an exponential expansion model of the early universe on the basis of the unified theory of interactions. This was named the Inflation Model by A. Guth, who proposed it independently. Name proposed by the discoverers following a suggestion by Y. Yamada.