Henry Draper Catalogue

The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars. In all, 359,083 stars were classified. The original HD catalogue covers the entire sky almost completely down to an apparent photographic magnitude of about 9; the extensions added fainter stars in certain areas of the sky. The construction of the Henry Draper Catalogue was part of a pioneering effort to classify stellar spectra, and its catalogue numbers are commonly used as a way of identifying stars.

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Henry Draper Catalogue - Availability and Usage
... Stars contained in the main portion of the catalogue are of medium magnitude, down to about 9m (about 1/15 as bright as the faintest stars visible with the naked eye) ... Stars in the original catalogue are numbered from 1 to 225300 (prefix HD) and are numbered in order of increasing right ascension for the epoch 1900.0 ... The Henry Draper Catalogue and the Extension were available from the NASA Astronomical Data Center as part of their third CD-ROM of astronomical catalogues ...

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