Kiyotsugu Hirayama

Kiyotsugu Hirayama
平山 清次
BornOctober 3, 1874
Sendai, Japan
DiedApril 8, 1943(1943-04-08) (aged 68)
Tokyo, Japan
Alma materTokyo Imperial University
Known forHirayama families
Scientific career
Notable studentsYoshio Fujita

Kiyotsugu Hirayama (平山 清次, Hirayama Kiyotsugu, October 3, 1874 – April 8, 1943) was a Japanese astronomer, best known for his discovery that many asteroid orbits were more similar to one another than chance would allow, leading to the concept of asteroid families, now called "Hirayama families" in his honour.[1]

  1. ^ Yoshida, Seiko; Nakamura, Tsuko (2011). "Hirayama Kiyotsugu: Discoverer of Asteroid Families". Highlighting the History of Astronomy in the Asia-Pacific Region. Astrophysics and Space Science Proceedings: 171–197. doi:10.1007/978-1-4419-8161-5_10. ISBN 978-1-4419-8160-8. Retrieved 30 March 2022.