ASTRONOMER

Kiyotsugu Hirayama

1874 - 1943

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Icon of person Kiyotsugu Hirayama

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

Since 2007, the English Wikipedia page of Kiyotsugu Hirayama has received more than 29,551 page views. His biography is available in 19 different languages on Wikipedia (up from 18 in 2019). Kiyotsugu Hirayama is the 360th most popular astronomer (up from 387th in 2019), the 1,089th most popular biography from Japan (up from 1,124th in 2019) and the 2nd most popular Japanese Astronomer.

Memorability Metrics

  • 30k

    Page Views (PV)

  • 50.13

    Historical Popularity Index (HPI)

  • 19

    Languages Editions (L)

  • 7.50

    Effective Languages (L*)

  • 1.67

    Coefficient of Variation (CV)

Among ASTRONOMERS

Among astronomers, Kiyotsugu Hirayama ranks 360 out of 644. Before him are Viktor Knorre, Heikki A. Alikoski, Christopher Hansteen, Georg Marcgrave, Beatrice Tinsley, and Nikolai Aleksandrovich Kozyrev. After him are Giorgio Abetti, Heber Doust Curtis, Jean Richer, Carl Keenan Seyfert, Richard Martin West, and Dirk Brouwer.

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Contemporaries

Among people born in 1874, Kiyotsugu Hirayama ranks 144. Before him are Charles Despiau, Vladimir Grigoryevich Fyodorov, J. C. Leyendecker, Iraj Mirza, Ernst Streeruwitz, and Alfred Tysoe. After him are Leonard Eugene Dickson, Jerzy Żuławski, Ludwig Diels, Charles William Miller, Sténio Vincent, and Friedrich Hasenöhrl. Among people deceased in 1943, Kiyotsugu Hirayama ranks 140. Before him are Anita Augspurg, Henri-Jean Guillaume Martin, Kočo Racin, A. Merritt, Dora Gerson, and Kristjan Raud. After him are Damrong Rajanubhab, Charley Paddock, Heinrich Zimmer, Walter Thiel, Eugeniusz Bodo, and Lucien Démanet.

Others Born in 1874

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Others Deceased in 1943

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In Japan

Among people born in Japan, Kiyotsugu Hirayama ranks 1,089 out of 6,245. Before him are Hidemaro Watanabe (1924), Shigemi Ishii (1951), Tsuneko Okazaki (1933), Uemura Shōen (1875), Shirase Nobu (1861), and Thomas Aquino Manyo Maeda (1949). After him are Masujiro Nishida (1899), Teizo Takeuchi (1908), Morihiro Saito (1928), Miho Kaneda (1950), Peter Doi (1892), and Yoshio Kikugawa (1944).

Others born in Japan

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Among ASTRONOMERS In Japan

Among astronomers born in Japan, Kiyotsugu Hirayama ranks 2. Before him are Takeshi Urata (1947). After him are Chushiro Hayashi (1920), Tsutomu Seki (1930), Hiroshi Kaneda (1953), Hiroki Kosai (1933), Yuji Hyakutake (1950), Takao Kobayashi (1961), Hisashi Kimura (1870), Kaoru Ikeya (1943), Minoru Honda (1913), and Okuro Oikawa (1896).

Japanese born Astronomers

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