Original Catalog
The 44 years work of the Bonner Durchmusterung (abbreviated by BD) resulted in a catalogue giving the positions and apparent magnitudes of approximately 325,000 stars to apparent magnitude 9–10. It was the basis for an excellent star atlas (some 100 pages) and for the AGK and SAO catalogues of the 20th century. The BD star numbers are still used and allow the correlation of this pioneering work with modern projects.
The format of a BD number is exemplified by BD-16 1591 which is the BD number of Sirius. This number signifies that in the catalog Sirius is the 1591-th star listed in the declination zone between-16 and -17 degrees, counting from 0 hours right ascension.
Read more about this topic: Durchmusterung
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