Kiyotsugu Hirayama

Kiyotsugu Hirayama (平山清次, Hirayama Kiyotsugu, October 13, 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.

The crater Hirayama on the Moon is jointly named after him and Shin Hirayama. The asteroid 1999 Hirayama is named in his honour.

References

月の命名 (Japanese)
Groups of asteroids probably of common origin, Astronomical Journal, Vol. 31, No. 743, pp. 185-188, October 1918
(English) Obituary Notices (Monthly Notices of the Royal Astronomical Society, Vol. 107, p. 42-44 - Obituary Notices :- Hirayama, Kiyotsugu)

Authority control	WorldCat Identities VIAF: 68816448 LCCN: nr95000480 ISNI: 0000 0000 8258 1654 SUDOC: 081446209 NDL: 00011391 CiNii: DA03530328

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