Hiroki Kosai (香西 洋樹, Kōsai Hiroki; 8 February 1933 – 26 March 2026) was a Japanese astronomer with the Kiso Observatory. He is best known for helping to popularize astronomy in Japan and for his observations of comets and asteroids, most notably with his co-discovery of the comet 1976 XVI. He is credited by the Minor Planet Center (MPC) with the discovery of nearly 100 asteroids. Kosai died on 26 March 2026, at the age of 93.
Source: “Hiroki Kosai”, English Wikipedia (CC BY-SA 4.0), excerpt
🎓 Keio University🏫 Konko Gakuen High School📅 Born February 8🎂 Born 1933📍 From Kurashiki, Okayama Prefecture💼 Literary Scholar