ASTRONOMER

Kiyotsugu Hirayama

1874 - 1943

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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. Read more on Wikipedia

His biography is available in different languages on Wikipedia. Kiyotsugu Hirayama is the 398th most popular astronomer (down from 360th in 2019), the 1,119th most popular biography from Japan (down from 1,089th in 2019) and the 4th most popular Japanese Astronomer.

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Among ASTRONOMERS

Among astronomers, Kiyotsugu Hirayama ranks 398 out of 644. Before him are Nathaniel Bliss, Louis Boyer, Chushiro Hayashi, James Gunn, Paris Pişmiş, and Gustav Spörer. After him are Viktor Knorre, Alvan Graham Clark, Henry E. Holt, Dorothea Klumpke, Ludwig Biermann, and Geoffrey Burbidge.

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Contemporaries

Among people born in 1874, Kiyotsugu Hirayama ranks 155. Before him are Lucien Démanet, Vladimir Grigoryevich Fyodorov, J. C. Leyendecker, Oskari Mantere, James H. Johnson, and Manuel Díaz. After him are Charles W. Gilmore, Henry Travers, Fejzi Alizoti, Nasrullah Khan, Iraj Mirza, and Friedrich Hasenöhrl. Among people deceased in 1943, Kiyotsugu Hirayama ranks 149. Before him are Dora Gerson, Lucien Démanet, Doris Miller, Walter von Brockdorff-Ahlefeldt, Helen Herron Taft, and Kristjan Raud. After him are Aleš Hrdlička, Damrong Rajanubhab, Mihailo Petrović, Vittorio Sella, Aliagha Shikhlinski, and Nikolai Avksentiev.

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In Japan

Among people born in Japan, Kiyotsugu Hirayama ranks 1,119 out of 6,245. Before him are Hidetsugu Yagi (1886), Ayumi Hamasaki (1978), Shuntarō Tanikawa (1931), Yūsaku Matsuda (1949), Ōmura Masujirō (1824), and Hisashi Owada (1932). After him are Hiroyuki Usui (1953), Norio Wakamoto (1945), Shigeru Kayano (1926), Shigemitsu Sudo (1956), Akira Terao (1947), and Kenji Kawai (1957).

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Among ASTRONOMERS In Japan

Among astronomers born in Japan, Kiyotsugu Hirayama ranks 4. Before him are Takeshi Urata (1947), Tsutomu Seki (1930), and Chushiro Hayashi (1920). After him are Hisashi Kimura (1870), Hiroki Kosai (1933), Minoru Honda (1913), Kaoru Ikeya (1943), Okuro Oikawa (1896), Hiroshi Kaneda (1953), Yuji Hyakutake (1950), and Kiichirō Furukawa (1929).

Japanese born Astronomers

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