Cocoon Nebula IC5146 and dark tail

IC 5146 is a reflection/emission nebula in the constellation Cygnus. The NGC description refers to IC 5146 as a cluster of 9.5 mag stars. The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago; the nebula is about 15 light years across. When viewing IC 5146, dark nebula Barnard 168 (B168) is an inseparable part of the experience, forming a dark lane that surrounds the cluster and projects westward forming the appearance of a trail behind the Cocoon.