Named in memory of Kiyoshi Mori (1906–1976), who calculated more than 400 circular, elliptical and parabolic orbits of minor planets and comets using an abacus and logarithm tables. After carrying out a statistical study of orbits of minor planets at Tokyo Imperial University in 1929 under the guidance of Hirayama {see planet  (1999)}, he was a professor of physics, mathematics and statistics at many high schools and colleges. (M 18308) _ _.