Career
He has discovered a number of comets, including the celebrated bright C/1965 S1 (Ikeya-Seki). He has also discovered a large number of asteroids, including the Amor asteroid (13553) 1992 Journal of Economics and the Trojan asteroid (5209) 1989 CW1. Many of his discoveries are named after famous sites in Kōchi, such as Harimaya-bashi, Ryōma (after Sakamoto Ryōma), Katsurahama, and Kagami-gawa.
He is Director of the Geisei Observatory in Kōchi, and in charge of the Comet Section of the Oriental Astronomical Association.