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Alvan Graham Clark (July 10, 1832June 9, 1897), born in Fall River, Massachusetts, was an American astronomer and telescope-maker. He was the son of Alvan Clark. In 1862, while testing Northwestern University's Dearborn Telescope in Evanston, Illinois, which was a new 18-inch refracting telescope, he discovered Sirius B, the magnitude 8 companion of Sirius and the first known white dwarf.

See also

* List of astronomical instrument makers


* "Alvan Clark, Astronomy, Biographies". AllRefer.com.

Astronomy Encyclopedia

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