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ASTRONOMER

Kiyotsugu Hirayama

1874 - 1943

Photo of Kiyotsugu Hirayama

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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

Since 2007, the English Wikipedia page of Kiyotsugu Hirayama has received more than 27,760 page views. His biography is available in 18 different languages on Wikipedia. Kiyotsugu Hirayama is the 387th most popular astronomer (down from 330th in 2019), the 1,127th most popular biography from Japan (down from 977th in 2019) and the most popular Japanese Astronomer.

Memorability Metrics

  • 28k

    Page Views (PV)

  • 47.31

    Historical Popularity Index (HPI)

  • 18

    Languages Editions (L)

  • 6.35

    Effective Languages (L*)

  • 1.83

    Coefficient of Variation (CV)

Page views of Kiyotsugu Hirayamas by language


Among ASTRONOMERS

Among astronomers, Kiyotsugu Hirayama ranks 387 out of 531. Before him are Christian August Friedrich Peters, Henry E. Holt, Joseph Johann von Littrow, Zdeňka Vávrová, Nikolai Aleksandrovich Kozyrev, and Gottfried Kirch. After him are Ludwig Biermann, Brian Schmidt, William Christie, Tsutomu Seki, Bart Bok, and Geoffrey Burbidge.

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Contemporaries

Among people born in 1874, Kiyotsugu Hirayama ranks 151. Before him are Dmitry Gulia, Abbas Sahhat, Frank Elmore Ross, Henry Travers, Honus Wagner, and J. C. Leyendecker. After him are Theodore Lyman IV, Leonard Eugene Dickson, Ernst Streeruwitz, Emmanuel Célestin Suhard, Johannes Baumann, and Ricardo Leoncio Elías Arias. Among people deceased in 1943, Kiyotsugu Hirayama ranks 151. Before him are Oskar Messter, Jenő Rejtő, Rihard Jakopič, Alastair Windsor, 2nd Duke of Connaught and Strathearn, Adolf Urban, and Géo André. After him are Elise Richter, Kristjan Raud, Ernst Trygger, W. W. Jacobs, Thomas Madsen-Mygdal, and Lajos Werkner.

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 1,127 out of 6,048. Before him are Yuko Shimizu (1946), Toshimitsu Motegi (1955), Takeshi Shudo (1949), Miyamoto Yuriko (1899), Tura Satana (1938), and Stephen Fumio Hamao (1930). After him are Hiroshi Yoshida (1958), Yoshiyuki Sadamoto (1962), Gyoji Matsumoto (1934), Shinji Okazaki (1986), Tsutomu Seki (1930), and Moto Hagio (1949).

Others born in Japan

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Among ASTRONOMERS In Japan

Among astronomers born in Japan, Kiyotsugu Hirayama ranks 1. After him are Tsutomu Seki (1930), Chushiro Hayashi (1920), Takeshi Urata (1947), Yuji Hyakutake (1950), Hisashi Kimura (1870), Hiroki Kosai (1933), Seiji Ueda (1952), Kiichirō Furukawa (1929), Okuro Oikawa (1896), Hiroshi Kaneda (1953), and Takao Kobayashi (1961).

Japanese born Astronomers

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