Knowra Annie Jump Cannon Annie Jump Cannon Annie Jump Cannon (1863–1941) was an American astronomer who classified hundreds of thousands of stars and helped establish the Harvard spectral classification system.
Williamina Fleming : A Scottish-American astronomer who led Harvard College Observatory’s team of women computers and classified stars. Fleming supervised Cannon’s early work and helped build the observatory’s stellar classification program.
Stellar spectroscopy : The study of stars through the wavelengths and spectral lines in their light. Cannon classified stars by comparing the absorption features in their spectra.
Henry Draper Catalogue : A catalog of stellar positions, magnitudes, and spectral classifications compiled at Harvard College Observatory. Cannon classified most of the stars in this landmark catalog and its extension.
Annie Jump Cannon classification system : Cannon’s practical ordering of stellar spectra into the O, B, A, F, G, K, and M sequence. This is the specific classification method associated with Cannon’s name and work.
Antonia Maury : An American astronomer who developed a detailed stellar classification system at Harvard College Observatory. Maury’s scheme differed from Cannon’s, prompting debate over how stellar spectra should be organized.
Harvard spectral classification : A system that arranges stars into spectral types O, B, A, F, G, K, and M, chiefly by absorption-line patterns. Cannon refined and applied this sequence as the observatory’s standard classification.
Henry Draper Catalogue Extension : A 1925–1936 Harvard catalog extending stellar spectral classifications to millions of stars. Cannon directed the work that carried her classification system to a far larger stellar sample.
Maury stellar classification system : A detailed stellar classification scheme developed by Antonia Maury that recorded spectral-line widths and appearances. Maury preserved more spectral detail than Cannon’s streamlined sequence, though Cannon’s system gained wider adoption.
Henrietta Swan Leavitt : An American astronomer whose discovery of the period–luminosity relation for Cepheid variable stars enabled distance measurements. Leavitt worked alongside Cannon in Harvard’s women-led astronomical computing group.
Stellar spectral type : A category describing a star’s spectrum, correlated chiefly with its surface temperature. Each classification Cannon assigned placed a star within a recognizable spectral category.
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