Durchmusterung
| Alternative names | Bonner Durchmusterung |
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| Survey type |
star catalogue, astronomical survey 
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In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.
The name comes from Durchmusterung ("run-through examination"), a German word used for a survey of objects or data. The term has sometimes been used for other astronomical surveys, including not only stars but also the search for other celestial objects. Special tasks are the celestial scanning in electromagnetic wavelengths which are shorter or longer than visible light waves.
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 1591st star listed in the declination zone between-16 and -17 degrees, counting from 0 hours right ascension. Stellar positions and zone boundaries use an equinox (celestial coordinates)/epoch of B1855.0.
Many astronomical research projects — from studies of celestial mechanics and the solar system, up to the nascent field of astrophysics — were made possible by the publication of the Atlas and data of the Bonner Durchmusterung. However, a deficiency of the BD was that it did not cover the whole sky, because far southern stars are not visible from Germany.
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