Alvan Graham Clark bigraphy, stories - American astronomer

Alvan Graham Clark : biography

July 10, 1832 - June 9, 1897

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 18½ 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.

The 18½ inch refracting telescope is now still being used at the landmark Dearborn Observatory of Northwestern University in Evanston, Illinois.

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