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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]
Kiyotsugu Hirayama | |
|---|---|
平山 清次 | |
| Born | October 3, 1874 Sendai, Japan |
| Died | April 8, 1943 (aged 68) Tokyo, Japan |
| Alma mater | Tokyo Imperial University |
| Known for | Hirayama families |
| Scientific career | |
| Notable students | Yoshio Fujita |
Biography
Hirayama studied astronomy at Imperial University of Tokyo and graduated in 1897. He taught astronomy in the engineering school of the General Staff Office of the Japanese Army between 1897 and 1901. In 1906 he became Assistant Professor of Astronomy at Tokyo Imperial University; in 1919 he became a Professor. From 1906 to 1907 Hirayama was a member of the Committee that determined the latitude border at Sakhalin after the Russo–Japanese War. In 1911 he received a doctoral degree "with several papers about latitude variation". Hirayama started working on asteroids in 1905; in 1918 he published papers "Researches on the distribution of the mean motions of the asteroids" and "Groups of asteroids probably of common origin", and, later "Families of asteroids" (1922) and "Note on an explanation of the gaps of the asteroidal orbits" (1928). In 1935 he published his main work, Asteroid.[1]
The crater Hirayama on the Moon is jointly named after him and Shin Hirayama. The asteroid 1999 Hirayama is named in his honour.[2]
References
- Yoshida, Seiko; Nakamura, Tsuko (2011). "Hirayama Kiyotsugu: Discoverer of Asteroid Families". Highlighting the History of Astronomy in the Asia-Pacific Region: 171–197. doi:10.1007/978-1-4419-8161-5_10. Retrieved 30 March 2022.
- "(1999) Hirayama". (1999) Hirayama In: Dictionary of Minor Planet Names. Springer. 2003. p. 162. doi:10.1007/978-3-540-29925-7_2000. ISBN 978-3-540-29925-7.
External links
- 月の命名 (in Japanese)
- Groups of asteroids probably of common origin, Astronomical Journal, Vol. 31, No. 743, pp. 185-188, October 1918
- (in English) Obituary Notices (Monthly Notices of the Royal Astronomical Society, Vol. 107, p. 42-44 - Obituary Notices :- Hirayama, Kiyotsugu)
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На других языках
[de] Kiyotsugu Hirayama
Hirayama Kiyotsugu (jap. 平山 清次; * 13. Oktober 1874 in Sendai; † 8. April 1943 in Tokio) war ein japanischer Astronom.- [en] Kiyotsugu Hirayama
[es] Kiyotsugu Hirayama
Kiyotsugu Hirayama (平山清次, Hirayama Kiyotsugu?, 13 de octubre de 1874 - 8 de abril de 1943) fue un astrónomo japonés, conocido por el descubrimiento de las familias de asteroides, grupos de asteroides que comparten similares regiones orbitales. Los grupos que identificó se llaman familias de Hirayama en su honor.[fr] Kiyotsugu Hirayama
Kiyotsugu Hirayama (平山 清次, ひらやま きよつぐ, Hirayama Kiyotsugu?), né le 13 octobre 1874 et mort le 8 avril 1943, est un astronome japonais.[it] Kiyotsugu Hirayama
Kiyotsugu Hirayama (13 ottobre 1874 – 8 aprile 1943) è stato un astronomo giapponese.[ru] Хираяма, Киёцугу
Киёцугу Хираяма (яп. 平山 清次 Хираяма Киёцугу, 1874—1943) — японский астроном.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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