| Alvan Graham Clark | |
|---|---|
 Alvan Clark and his assistant Carl Ludin (right) alongside
of the 40-inch lens, 1896.
|
|
| Born | July
10, 1832 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 1/2 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 18 1/2 inch refracting telescope is now still being used at the landmark Dearborn Observatory of Northwestern University in Evanston, IL. [1]
  | Circumstances of the day deliver Observatory - Circumstances of the day deliver Observatory, Historic Moments, Northwestern University |
| | Northwestern University Astronomy and Astrophysics - History of Dearborn Observatory - Northwestern University Astronomy and Astrophysics - History of Dearborn Observatory |
| | Sirius A & B: A Double Star System In The Constellation Canis Major - Chandra :: Photo Album :: Sirius A & B :: 26 Sep 00 |
| | Look south to see winter's brightest constellations - Look south to see winter's brightest constellations - The Boston Globe |
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