The tricky line of sight towards Cygnus-X: The [DB2001] CL05 embedded cluster as a pilot case

The nearest massive star-forming complex, Cygnus-X, is widely used as a laboratory for star clusterformation and feedback processes, under the implicit assumption that all its components are located roughly at the same distance. We present a multi-wavelength study of a 15' x 15' field in southern Cygnus-X, where different components involving clustered star formation are overlapped. Preliminary results indicate that the Berkeley 87 and [DB2001] CL05 clusters are actually located at very different distances, invalidating previous claims of physical interaction between them. This shows the importance of a careful treatment of extinction and distance calculations for cluster formation studies, particularly in Cygnus-X.