What is "durchmusterung"

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.

Today, the term Durchmusterung includes 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 name comes from Durchmusterung ("run-through examination"), a German word used for a systematic survey of objects or data.