IC5146 Cocoon Nebula

The common name of IC5146 or Caldwell C19 is the Cocoon Nebula. It is about 4000 light years away and is approximately 8 light years in diameter. It is a collection of a small number of stars along with a nursery that is generating hundreds of new stars.

IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg), CC BY 4.0 via Wikimedia Commons

The Cocoon Nebula is also located in the constellation Cygnus and is high over head in the late evening (~10PM) in late August / early September.

The image is a modest 5 hour exposure, 2 hours Luminance and 1 hour each colour channel (RGB) taken over three nights in early November 2021.

Location	Old Photons Observatory Ottawa Ontario
Date	November 2021
Conditions
Weather
Mount	Paramount MX
Optical Instrument	Celestron EDGE11 with F7 Focal reducer
Camera Instrument	SBIG STF-8300 CCD Temperature -20C
Focus	Position = 1589 Avg HFD = 3.93 Avg FWHM = 3.19 Temperature: 11.5 Filter: Lum (slot 5)
Guider	ZWO
Focal Ratio	Imaging at f/7, Guiding at f/4.9
Focal Length	Expected = 1960mm, Measured = 1950.4 mm
Exposure	5 Hours total R 1h (6x10min) @ 2×2 Binning G 1h (6x10min) @ 2×2 Binning B 1h (6x10min) @ 2×2 Binning L 2h (6x20min) @ 1×1 Binning
Image scale	Expected = 0.57, Measured = 0.57(arcsec/pix)
Image Center (J2000)	21° 53’ 24.00” 45° 16’ 01.2”
Image FWHM	Measured = 4.8 arcsec (8.5 pixels)
Image Processing	Astrometric Alignment stacking in MaxIM DL Digital Development 3×3 Median Kernel Filter