|  Share | Cite

Annie Jump Cannon

Cannon, Annie Jump, 1863–1941, American astronomer, b. Dover, Del. In 1897 she became an assistant in the Harvard College Observatory, where (1911–38) she was astronomer and curator of astronomical photographs. Recognizing that spectra of many stars had been photographed in the second half of the 19th cent., Cannon classified more than 500,000 stars, in the process publishing many papers on the subject. One of the most significant achievements in 20th-century astronomy and the basis for contemporary theoretical understanding of stellar evolution, the catalog, named after its patron Henry Draper, is still in use. In the course of her photographic work she discovered 300 variable stars, 5 novas, 1 spectroscopic binary, and many stars with bright lines or variable spectra. In 1896 she discovered SS Cygni, a "dwarf nova" that repeats its outbursts about every 60 days. She made a bibliography of variable stars that includes about 200,000 references. Each year the American Association of University Women presents the Annie J. Cannon Award for distinguished contributions to astronomy.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on Annie Jump Cannon from Infoplease:

  • cannon: meaning and definitions - cannon: Definition and Pronunciation
  • Women Scientists - Enterprising female scientists from Elizabeth Garrett Anderson to Rosalyn Sussman Yalow.
  • Delaware - Information on Delaware — economy, government, culture, state map and flag, major cities, points of interest, famous residents, state motto, symbols, nicknames, and other trivia.
  • December 11 Birthdays: Aleksandr Isayevich Solzhenitsyn - December 11 birthdays: Aleksandr Isayevich Solzhenitsyn, Carlo Ponti, Naguib Mahfouz, Sir David Brewster, John F. Kerry, Annie Jump Cannon, Fiorello Henry LaGuardia, Mos Def, Willie Mae Thornton, Louis-Hector Berlioz, Robert Koch
  • The National Women's Hall of Fame - The National Women's Hall of Fame The National Women's Hall of Fame is the only national ...

See more Encyclopedia articles on: Astronomy: Biographies