Hiroki Kosai

Hiroki Kosai (Japanese香 西 洋 树, Hiroki Kosai; born February 8, 1933, Kurashiki ) is a Japanese astronomer.

Kosai is co-discoverer of 92 asteroids 1976-1986 of which 92 with Kiichiro Furukawa ..

He is also the co-discoverer of the comet D/1977 C1 ( Skiff - Kosai ).