NRS-22178 | Lists and discussion of Harvard Plates [Sydney Observatory]

Lists and discussion of the Harvard Plates, a collection of astronomical plates at the Harvard College Observatory containing of the order of 500,000 plates taken between the mid 1880s and 1989 (with a gap 1953-68). A few thousand direct plates, mainly blue, were taken with the 1.5-m reflectors located in both northern and southern hemispheres. These have a focal scale of 26 arcsec/mm. The plates cover many astronomical objects, such as galaxies, clusters, and nebulae. The collection also contains most of the 1200 plates of star clusters and double stars taken by Benjamin Gould in Cordoba, Argentina, during the 1870s and 1880s.