Johann Gottfried Galle: Difference between revisions - Wikipedia

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===Discovery of Neptune===

{{Main|Discovery of Neptune}}

[[File:Deutsches Museum München - 15803973590.jpg|thumb|upright|The 9" refractor telescope which Galle used to discover Neptune]]

Around the same time in 1845 he sent a copy of his thesis to [[Urbain Le Verrier]], but only received an answer a year later. Sent on 18 September 1846, it reached Galle on the morning of 23 September. Le Verrier had been investigating the [[Perturbation (astronomy)|perturbations of the orbit]] of the planet [[Uranus]] and from this he derived the position of a still undiscovered planet, and requested Galle to search in the corresponding section of sky. The very same night (after Encke gave permission to search, against his own judgement), in collaboration with his assistant [[Heinrich Louis d'Arrest]], Galle discovered a star of 8th [[Apparent magnitude|magnitude]], only 1° away from the calculated position, which was not recorded in the ''Berliner Akademischen Sternkarte''. Over the next two evenings, a [[proper motion]] of the celestial object of 4 [[minute of arc|seconds of arc]] was measured, which determined it absolutely as a planet, for which Le Verrier proposed the name [[Neptune]]. Galle always refused to be acknowledged as the discoverer of Neptune; he attributed the discovery to Le Verrier.

In 1847 Galle was designated as the successor to [[Friedrich Wilhelm Bessel]] as Director of [[Königsberg Observatory]]. Before the enacted nomination from [[Frederick William IV of Prussia|Friedrich Wilhelm IV]] effected ''de facto'', Galle withdrew his application at the beginning of 1848 due to an intrigue against him led by [[Carl Gustav Jacob Jacobi]].<ref>[[Diedrich Wattenberg]]: ''Nach Bessels Tod -– Eine Sammlung von Dokumenten''. Veröffentlichungen der Archenhold-Sternwarte Berlin-Treptow Nr. 7. 1976</ref>

== Breslau Observatory ==

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==Legacy==

[[Google]] celebrated Galle's 200th birthday with a [[Google Doodle]].<ref>{{Cite web | url=https://wwwdoodles.google.com/doodlesdoodle/johann-gottfried-galles-200th-birthday/ | title=Johann Gottfried Galle's 200th Birthday }}</ref>

==References==

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===Obituaries===

*{{cite journal |bibcode=1910AN....185..309F |title=Anzeige des Todes von Johann Gottfried Galle |last1=Franz |first1=J. |volume=185 |date=1910 |pages=309 |journal=[[Astronomische Nachrichten]] |doi=10.1002/asna.19101851906 |issue=19|language=de|url=https://zenodo.org/record/1424871 }}

*{{cite journal |bibcode=1910JRASC...4..379C |title=Johann Gottfried Galle |last1=Chant |first1=C. A. |volume=4 |date=1910 |pages=379 |journal=[[Journal of the Royal Astronomical Society of Canada]]}}

*{{cite journal |bibcode=1911MNRAS..71R.275. |title=Obituary Notices : Associates : Galle, Johann Gottfried |volume=71 |date=1911 |pages=275 |journal=[[Monthly Notices of the Royal Astronomical Society]] | doi = 10.1093/mnras/71.4.272|doi-access=free }}

*{{cite journal |bibcode=1910Obs....33..311. |title=Obituaries: G. V. Schiaparelli, J. G. Galle, J. B. N. Hennessey J. Coles, J. E. Gore |volume=33 |date=1910 |pages=311 |journal=[[The Observatory (journal)|The Observatory]]}}

===Astronomical images===

*[http://mars.jpl.nasa.gov/gallery/craters/PIA01676.html NASA photo of the Mars crater ''Galle'' (a.k.a., "Happy Face Crater")]

{{Neptune}}

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[[Category:Academic staff of the University of Breslau]]

[[Category:Recipients of the Lalande Prize]]

[[Category:Prussian astronomers]]