Alvan Graham Clark

Infobox_Scientist
name = Alvan Graham Clark


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caption = Alvan Clark and his assistant Carl Ludin (right) alongside of the 40-inch lens, 1896.
birth_date = birth date|1832|7|10|mf=y
birth_place = Fall River, Massachusetts
death_date = death date and age|1897|6|9|1832|7|10|mf=y
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nationality = American
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field = Astronomy
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known_for = Sirius B
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Alvan Graham Clark (July 10, 1832 – June 9, 1897), born in Fall River, Massachusetts, was an American astronomer and telescope-maker. He was the son of Alvan Clark founder of Alvan Clark & Sons.

On January 31, 1862, while testing a new 18-inch refracting telescope, he made the first observation of Sirius B in Cambridgeport, Massachusetts. The magnitude 8 companion of Sirius is also the first known white dwarf star.

ee also

*List of astronomical instrument makers

References

*
* [http://www.deller.com/newpage6.htm The Dearborn Telescope]
* [http://chandra.harvard.edu/photo/2000/0065/index.html Sirius A & B: A Double Star System In The Constellation Canis Major]
* [http://www.astro.northwestern.edu/Observatory/chronology2.html Northwestern University Astronomy and Astrophysics - History of Dearborn Observatory]
* [http://www.boston.com/news/local/articles/2008/02/02/look_south_to_see_winters_brightest_constellations Look south to see winter's brightest constellations]

Persondata
NAME= Clark, Alvan Graham
ALTERNATIVE NAMES=
SHORT DESCRIPTION= American astronomer
DATE OF BIRTH= July 10, 1832
PLACE OF BIRTH= Fall River, Massachusetts
DATE OF DEATH= June 9, 1897
PLACE OF DEATH=