IC 5146 is a reflection/emission nebula in the constellation Cygnus.
IC 5146 refers specifically to the star cluster and Sh2-125 to the nebula.
It shines at magnitude +10.0
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 12 arcmins across, which is equivalent to a span of 15 light years.
When viewing IC 5146, dark nebula Barnard 168 (B168) is forming a dark lane that surrounds the cluster and projects westward forming the appearance of a trail behind the Cocoon.(WIKI)

Imaged with 10" F/2.8 POWERNEWT Astrograph.
3:40 HRS total with Orion Starshoot pro 2 color camera
Losmandy G 11 mount with Gemini 2

Imaged from the NEGEV desert in ISRAEL