Alvan Graham Clark

Alvan Graham Clark
Alvan Clark and his assistant Carl Ludin (right) alongside of the 40-inch lens, 1896.
Born	July 10, 1832(1832-07-10) Fall River, Massachusetts
Died	June 9, 1897 (aged 64)
Nationality	American
Fields	Astronomy
Known for	Sirius B

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.

[edit] See also

• List of astronomical instrument makers

[edit] References

• "Alvan Clark, Astronomy, Biographies". AllRefer.com. 
• The Dearborn Telescope
• Sirius A & B: A Double Star System In The Constellation Canis Major
• Northwestern University Astronomy and Astrophysics - History of Dearborn Observatory
• Look south to see winter's brightest constellations

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