| Date | Text | |
|---|---|---|
13 Apr 1941
nbsp; Annie Jump Cannon |
death nbsp; Annie Jump Cannon Died 13 Apr 1941 at age 77 (born 11 Dec 1863). American, deaf astronomer who specialized in the classification of stellar spectra. In 1896 she was hired at the Harvard College Observatory, remaining there for her entire career. The Harvard spectral classification system had been first developed by Edward C. Pickering, Director of the Observatory, around the turn of the century using objective prism spectra taken on improved photographic plates. In conjunction with Pickering Cannon was to further develop, refine, and implement the Harvard system. She reorganized the classification of stars in terms of surface temperature in spectral classes O, B, A, F, G, K, M, and catalogued over 225,000 stars for the monumental Henry Draper Catalogue of stellar spectra, (1918-24). |
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