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Bonner Durchmusterung(bon -er) (BD) The Bonn Survey, a general star catalog prepared under the direction of the Prussian astronomer Friedrich Argelander and published in Bonn 1859–62. The original catalog contained 324 189 stars – i.e. all those visible in the three-inch (76.2-centimeter) Bonn refractor – lying between declinations of +90° and –2°. The limiting magnitude was about 9.5. Accompanying star charts were published in 1863. It was extended by Eduard Schönfeld in 1886 to a declination of –23° and then included 457 857 stars. The epoch for the whole catalog was 1855.0.
A cataloged star is identified by the prefix BD and a number giving its declination zone (each 1° wide), followed by its number (in order of right ascension) within that zone, as in BD +52 1638.
Cataloging was extended to the south polar regions through an analogous work, The Córdoba Durchmusterung (CD), compiled at the Córdoba Observatory, Argentina, and finally completed in 1930. This catalog contains about 614 000 stars, brighter than 10th magnitude, from declinations –23° to –90° for the epoch 1875.0. Computerized versions of the BD and CD are now available. See also Cape Photographic Durchmusterung.