Bonner Dürchmusterung (BD)
The Bonner Dürchmusterung (BD) is a star atlas and catalogue listing the positions and magnitudes of 324,188 stars in the northern hemisphere to declintion 2° S and ninth magnitude. It was compiled by Friedrich Argelander in Bonn between 1859 and 1862, and extended by Eduard Schönfeld with a supplement of 133,659 southern stars to declination -23° S in 1886. Stars are numbered and designated in declination zones, for example "BD +12° 1438". Later came two more large southern star catalogues: the Cordoba Dürchmusterung produced between 1892 and 1932, and the Cape Photographic Dürchmusterung between 1895 and 1900.