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Alvan Graham Clark (July 10, 1832 – June 9, 1897) was an American astronomer and telescope-maker.
Alvan Graham Clark | |
|---|---|
 Alvan Clark and his assistant Carl Lundin (right) alongside the 40-inch lens, 1896 | |
| Born | July 10, 1832 Fall River, Massachusetts |
| Died | June 9, 1897 (aged 65) Cambridge, Massachusetts |
| Nationality | American |
| Known for | Sirius B |
| Scientific career | |
| Fields | Astronomy |
| Signature | |
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Biography
Alvan Graham Clark was born in Fall River, Massachusetts, the son of Alvan Clark, founder of Alvan Clark & Sons.[1]
On January 31, 1862, while testing a new 18.5-inch (470 mm) aperture great refractor telescope in Cambridgeport, Massachusetts, Clark made the first ever observation of a white dwarf star. This discovery of Sirius B, or affectionately "the Pup", proved an earlier hypotheses (Friedrich Bessel in 1844) that Sirius, the brightest star in the night sky with an apparent magnitude of −1.46, had an unseen companion disturbing its motion. Clark used the largest refracting telescope lens in existence at the time, and the largest telescope in the United States, to observe the magnitude 8 companion.
Clark's 18.5 inch refracting telescope was then delivered to his customer, the landmark Dearborn Observatory of Northwestern University in Evanston, Illinois, where it is still being used today.[2]
Alvan Graham Clark died in Cambridge, Massachusetts on June 9, 1897.[3]
See also
- List of astronomical instrument makers
References
- The National Cyclopaedia of American Biography. Vol. V. James T. White & Company. 1907. p. 386. Retrieved April 2, 2021 – via Google Books.
- Dearborn Observatory: History
- "Deaths". The Boston Globe. June 10, 1897. p. 10. Retrieved April 2, 2021 – via Newspapers.com.
- "Alvan Clark, Astronomy, Biographies". AllRefer.com. Archived from the original on June 23, 2004.
- 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
External links
Authority control | |
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| General | |
| National libraries | |
| Art research institutes | |
| Biographical dictionaries | |
| Scientific databases | |
| Other | |
На других языках
[de] Alvan Graham Clark
Alvan Graham Clark (* 10. Juli 1832 in Fall River, Massachusetts; † 9. Juni 1897 in Cambridge, Massachusetts) war ein US-amerikanischer Astronom und Teleskopbauer.- [en] Alvan Graham Clark
[fr] Alvan Graham Clark
Alvan Graham Clark, né à Fall River dans le Massachusetts le 10 juillet 1832 et mort le 9 juin 1897) à Cambridge (Massachusetts), est un astronome et un fabricant d'optique américain.[it] Alvan Graham Clark
Alvan Graham Clark (Fall River, 10 luglio 1832 – 9 giugno 1897) è stato un astronomo statunitense.[ru] Кларк, Алван Грейам
Алван Грейам Кларк (англ. Alvan Graham Clark; 10 июля 1832 (1832-07-10), Фолл-Ривер, Массачусетс, — 9 июня 1897) — американский астроном и изготовитель телескопов. Младший сын и деловой партнёр Элвина Кларка.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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