C 5146 (also Caldwell 19, Sh 2-125, Barnard 168, and the Cocoon Nebula) is a reflection/emission nebula and Caldwell object in the constellation Cygnus.
The NGC description refers to IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula. The cluster is also known as Collinder 470. It shines at magnitude +10.0/+9.3/+7.2. Its celestial coordinates are RA 21h 53.5m , dec +47° 16′. It is located near the naked-eye star Pi Cygni. A stellar nursery where star-formation is ongoing.




Observations by both the Spitzer Space Telescope and the Chandra X-ray Observatory have collectively identified hundreds of young stellar objects. Young stars are seen in both the emission nebula, where gas has been ionized by massive young stars, and in the infrared-dark molecular cloud that forms the "tail". The most-massive stars in the region is BD +46 3474, a star of class B1 that is an estimated 14±4 times the mass of the sun.

Another interesting star in the nebula is BD +46 3471, which is an example of a HAeBe star, an intermediate mass star with strong emission lines in its spectrum.



 Technical Data

Bortle Scale / SQM-L Bortle 5  / - 19.94 - 20.32
Period August 2022
Primary Scope  Takahashi (FSQ 106/530 + CCA250/1250)
Camera Moravian C3-26000  - QHY600
Mount AP1100 GTO CP4
Total Exposure Time 10 h
Composition LHRGB
Location Val Imagna (Bergamo) Italy

 © Efrem Frigeni Astrophoto

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