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Henry Draper Catalog (HD Catalog) A star catalog in nine volumes compiled by Annie J. Cannon and E.C. Pickering of the Harvard College Observatory and published 1918–24 as part of the Harvard Annals. It was the first catalog to assign stars to spectral classes as well as giving their positions and magnitudes. The catalog (a memorial to Henry Draper, a distinguished physician who, as an amateur astronomer, pioneered in the field of astronomical photography) was financed through a fund set up by Draper's wife after his death in 1882. It lists 225 300 stars for the epoch 1900.0, each allocated a spectral type according to the Harvard classification. The Henry Draper Extension (HDE), 1925–36, lists a further 133 700 stars. The entire catalog, of which the latest version appeared in 1985, is currently being reclassified on the MK system by a team from the University of Michigan led by Nancy Houk. Work on this publication, the Michigan Catalog of Two-dimensional Spectral Types for the HD Stars, began 1975.