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Kiyotsugu Hirayama : ウィキペディア英語版
Kiyotsugu Hirayama

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==

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



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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