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{{Nihongo|'''Yusuke Hagihara'''|萩原 雄祐|Hagihara Yūsuke|28 March 1897 in Osaka – 29 January 1979 in Tokyo}} was a Japanese [[astronomer]] noted for his contributions to [[celestial mechanics]].
{{Nihongo|'''Yusuke Hagihara'''|萩原 雄祐|Hagihara Yūsuke|28 March 1897 in Osaka – 29 January 1979 in Tokyo}} was a Japanese [[astronomer]] noted for his contributions to [[celestial mechanics]].


== Biography ==
⚫
Hagihara graduated from [[Tokyo Imperial University]] with a degree in astronomy in 1921 and became an assistant professor of astronomy there two years later.<ref name="Kozai1979">{{cite journal | last = Kozai | first = Yoshihide | title = Yusuke Hagihara | journal = Quart. Jour. Royal Astron. Soc. |volume = 20 | issue = 3 | date = 1979 | pages = 325–8}}</ref> In 1923 the Japanese government sent him abroad as a traveling scholar. Hagihara went to Cambridge University in England to study under the mathematician [[H.F. Baker]]<ref name="Kozai1979"/> and also visited the University of Göttingen and the Sorbonne. He returned to Japan in 1925 but left for the United States three years later to study [[dynamical systems]] theory at Harvard University under [[G. D. Birkhoff]] on a [[Rockefeller Foundation]] Fellowship.<ref name="Kozai1998">{{cite journal | last = Kozai | first = Yoshihide | title = Development of Celestial Mechanics in Japan | journal = Planet. Space Sci. | volume = 46 | issue = 8 | date = 1998 | pages = 1031–36|bibcode = 1998P&SS...46.1031K | doi=10.1016/s0032-0633(98)00033-6}}</ref>

⚫
Hagihara graduated from [[Tokyo Imperial University]] with a degree in astronomy in 1921 and became an assistant professor of astronomy there two years later.<ref name="Kozai1979">{{cite journal | last = Kozai | first = Yoshihide | title = Yusuke Hagihara | journal = Quart. Jour. Royal Astron. Soc. |volume = 20 | issue = 3 | date = 1979 | pages = 325–8}}</ref> In 1923 the Japanese government sent him abroad as a traveling scholar. Hagihara went to Cambridge University in England to study under the mathematician [[H.F. Baker]]<ref name="Kozai1979"/> and also visited the University of Göttingen and the Sorbonne.

He returned to Japan in 1925 but left for the United States three years later to study [[dynamical systems]] theory at Harvard University under [[G. D. Birkhoff]] on a [[Rockefeller Foundation]] Fellowship.<ref name="Kozai1998">{{cite journal | last = Kozai | first = Yoshihide | title = Development of Celestial Mechanics in Japan | journal = Planet. Space Sci. | volume = 46 | issue = 8 | date = 1998 | pages = 1031–36|bibcode = 1998P&SS...46.1031K | doi=10.1016/s0032-0633(98)00033-6}}</ref>

Hagihara finished his studies at Harvard in 1929 and returned again to the University of Tokyo where, in 1930, he completed a D.Sc. dissertation on the stability of satellite systems.<ref name="Kozai1979"/> He was promoted to full professor at the University of Tokyo five years later.<ref name="Kozai1979"/> From 1945 to 1957 he was the director of the Tokyo Astronomical Observatory and subsequently was a professor at [[Tohoku University]] (1957–1960) and president of [[Utsunomiya University]] (1961–1967).<ref name="Kozai1998"/> In 1961 he was elected vice-president of the [[International Astronomical Union]] and president of the IAU's commission on celestial mechanics.<ref name="Kozai1979"/>
Hagihara finished his studies at Harvard in 1929 and returned again to the University of Tokyo where, in 1930, he completed a D.Sc. dissertation on the stability of satellite systems.<ref name="Kozai1979"/> He was promoted to full professor at the University of Tokyo five years later.<ref name="Kozai1979"/> From 1945 to 1957 he was the director of the Tokyo Astronomical Observatory and subsequently was a professor at [[Tohoku University]] (1957–1960) and president of [[Utsunomiya University]] (1961–1967).<ref name="Kozai1998"/> In 1961 he was elected vice-president of the [[International Astronomical Union]] and president of the IAU's commission on celestial mechanics.<ref name="Kozai1979"/>

He retired from all of his official duties, except for the Japan Academy, in 1967 and devoted himself to writing his comprehensive five volume work, ''Celestial Mechanics'', which was based on his lecture notes.<ref name="Kozai1979"/>
He retired from all of his official duties, except for the Japan Academy, in 1967 and devoted himself to writing his comprehensive five volume work, ''Celestial Mechanics'', which was based on his lecture notes.<ref name="Kozai1979"/>


Hagihara was regarded as a quiet and cultured gentleman, an excellent teacher and a capable administrator.<ref name="Kozai1979"/><ref name="Herget1979">{{cite journal | last = Herget | first = Paul | authorlink = Paul Herget | title = Yusuke Hagihara | journal = Physics Today | volume = 32 | issue = 6 | date = 1979 | pages = 71 | url = http://www.physicstoday.org/resource/1/phtoad/v32/i6/p71_s1?bypassSSO=1 | doi=10.1063/1.2995600}}</ref> The asteroid [[1971 Hagihara]] is named after him.
Hagihara was regarded as a quiet and cultured gentleman, an excellent teacher and a capable administrator.<ref name="Kozai1979"/><ref name="Herget1979">{{cite journal | last = Herget | first = Paul | authorlink = Paul Herget | title = Yusuke Hagihara | journal = Physics Today | volume = 32 | issue = 6 | date = 1979 | pages = 71 | url = http://www.physicstoday.org/resource/1/phtoad/v32/i6/p71_s1?bypassSSO=1 | doi=10.1063/1.2995600}}</ref>


He has pointed out the importance of the post-Newton models for celestial mechanics, namely that developed by [[Georgi Manev]].{{citation needed|date=May 2014}}
He has pointed out the importance of the post-Newton models for celestial mechanics, namely that developed by [[Georgi Manev]].{{citation needed|date=May 2014}}


==Honors==
== Honors ==
* The main-belt asteroid [[1971 Hagihara]] was named in his honor.<ref name="springer" />
* Fellow of the [[Royal Astronomical Society]]
* Fellow of the [[Royal Astronomical Society]]
* Chairman of the National Committee of Astronomy (Japan)
* Chairman of the National Committee of Astronomy (Japan)
Line 17: Line 24:
* Recipient of the [[James Craig Watson Medal]] from the U.S. National Academy of Science (1960)
* Recipient of the [[James Craig Watson Medal]] from the U.S. National Academy of Science (1960)


==Works==
== Works ==
* {{cite book | last = Hagihara | first = Yusuke |
* {{cite book | last = Hagihara | first = Yusuke |
title = Celestial mechanics : Dynamical principles and transformation theory (vol. 1) | place = Cambridge | publisher = MIT Press | year = 1970 | isbn=0-262-08037-0}}
title = Celestial mechanics : Dynamical principles and transformation theory (vol. 1) | place = Cambridge | publisher = MIT Press | year = 1970 | isbn=0-262-08037-0}}
Line 34: Line 41:
location = Washington, D.C. | publisher = U. S. Government Printing Office | date = 1971 | id = NAS 1.21:186}}
location = Washington, D.C. | publisher = U. S. Government Printing Office | date = 1971 | id = NAS 1.21:186}}


==References==
== References ==
⚫
{{reflist|30em|refs=

<ref name="springer">{{cite book
|title = Dictionary of Minor Planet Names – (1971) Hagihara
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 159
|date = 2007
|url = http://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1972
|isbn = 978-3-540-00238-3
|accessdate = 29 August 2016}}</ref>

}} <!-- end of reflist -->

{{refbegin}}
{{refbegin}}
* {{cite book | editor-last = Greene | editor-first = Jay E. | title = McGraw-Hill Modern Scientists and Engineers. 3 vols | location = New York | publisher = McGraw-Hill | date = 1980}}
* {{cite book | editor-last = Greene | editor-first = Jay E. | title = McGraw-Hill Modern Scientists and Engineers. 3 vols | location = New York | publisher = McGraw-Hill | date = 1980}}
{{refend}}
{{refend}}
⚫
{{reflist}}


{{Authority control}}
{{Authority control}}

{{Use dmy dates|date=January 2011}}
{{Use dmy dates|date=January 2011}}


Revision as of 10:47, 4 April 2017

Yusuke Hagihara (萩原 雄祐, Hagihara Yūsuke, 28 March 1897 in Osaka – 29 January 1979 in Tokyo) was a Japanese astronomer noted for his contributions to celestial mechanics.

Biography

Hagihara graduated from Tokyo Imperial University with a degree in astronomy in 1921 and became an assistant professor of astronomy there two years later.[1] In 1923 the Japanese government sent him abroad as a traveling scholar. Hagihara went to Cambridge University in England to study under the mathematician H.F. Baker[1] and also visited the University of Göttingen and the Sorbonne.

He returned to Japan in 1925 but left for the United States three years later to study dynamical systems theory at Harvard University under G. D. Birkhoff on a Rockefeller Foundation Fellowship.[2]

Hagihara finished his studies at Harvard in 1929 and returned again to the University of Tokyo where, in 1930, he completed a D.Sc. dissertation on the stability of satellite systems.[1] He was promoted to full professor at the University of Tokyo five years later.[1] From 1945 to 1957 he was the director of the Tokyo Astronomical Observatory and subsequently was a professor at Tohoku University (1957–1960) and president of Utsunomiya University (1961–1967).[2] In 1961 he was elected vice-president of the International Astronomical Union and president of the IAU's commission on celestial mechanics.[1]

He retired from all of his official duties, except for the Japan Academy, in 1967 and devoted himself to writing his comprehensive five volume work, Celestial Mechanics, which was based on his lecture notes.[1]

Hagihara was regarded as a quiet and cultured gentleman, an excellent teacher and a capable administrator.[1][3]

He has pointed out the importance of the post-Newton models for celestial mechanics, namely that developed by Georgi Manev.[citation needed]

Honors

Works

  • Hagihara, Yusuke (1970). Celestial mechanics : Dynamical principles and transformation theory (vol. 1). Cambridge: MIT Press. ISBN 0-262-08037-0.
  • Hagihara, Yusuke (1972). Celestial mechanics: Perturbation theory (vol. 2, parts 1 and 2). Cambridge: MIT Press.
  • Hagihara, Yusuke (1975). Celestial mechanics: Differential equations in celestial mechanics (vol. 3, parts 1 and 2). Tokyo: Japan Society For the Promotion of Science.
  • Hagihara, Yusuke (1976). Celestial mechanics: Periodic and quasi-periodic solutions (vol. 4, parts 1 and 2). Tokyo: Japan Society For the Promotion of Science.
  • Hagihara, Yusuke (1977). Celestial mechanics: Topology of the three-body problem (vol. 5, parts 1 and 2). Tokyo: Japan Society For the Promotion of Science.
  • Hagihara, Yusuke (1971). Theories of equilibrium figures of a rotating homogeneous fluid mass. Washington, D.C.: U. S. Government Printing Office. NAS 1.21:186.

References

  1. ^ a b c d e f g Kozai, Yoshihide (1979). "Yusuke Hagihara". Quart. Jour. Royal Astron. Soc. 20 (3): 325–8.
  2. ^ a b Kozai, Yoshihide (1998). "Development of Celestial Mechanics in Japan". Planet. Space Sci. 46 (8): 1031–36. Bibcode:1998P&SS...46.1031K. doi:10.1016/s0032-0633(98)00033-6.
  3. ^ Herget, Paul (1979). "Yusuke Hagihara". Physics Today. 32 (6): 71. doi:10.1063/1.2995600.
  4. ^ Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1971) Hagihara. Springer Berlin Heidelberg. p. 159. ISBN 978-3-540-00238-3. Retrieved 29 August 2016.
  • Greene, Jay E., ed. (1980). McGraw-Hill Modern Scientists and Engineers. 3 vols. New York: McGraw-Hill.

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