Focal Pointe Observatory
Astrophotography by Bob Franke

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IC 5146 - The Cocoon Nebula

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Click here to view the image without Zoomify (2450 x 1800, 1.11MB)

 

 

 

Instrument

Takahashi FSQ-106ED @ f/5.0 (530 mm F.L.) Captured at 2.1 arcsec/pixel.  The Zoomify image scale is 2.80 to 9.77 arcsec / pixel.

Mount

Losmandy G11 with Gemini L4 v1.0

Camera

SBIG STF-8300M Self Guiding Package w/ mono ST-i, using Baader LRGB and an Astrodon Hα filters.

Acquisition Data

9/26/2012 to 11/13/2012 Chino Valley, AZ... with CCDAutoPilot5 & CCDSoft.  Off-axis guided.

Exposure

Lum 

245 min. (49 x 5 min. bin 1x1)

RGB 

210 min. (14 x 5 min. each bin 1x1)

Hα 

420 min. (28 x 15 min. bin 1x1)

Software

  • CCDSoft, CCDStack, Photoshop CS6, PixInsight and Noel Carboni's actions.

  • CCDStack to calibrate, register, normalize, data reject, combine the sub exposures and to create the RGB image.

  • eXcalibrator v3.1 for (g-r) color balancing, using 1,146 stars from the SDSS-DR8 database.

  • PixInsight for gradient removal and the initial non-linear stretching.

  • PhotoShop for LRGB combine, adding the Hα data to the red channel and final touch-up.

  • Noiseware Pro, a PhotoShop plug-in.

Comment

North is to the top.

IC 5146, The Cocoon Nebula, is located in the constellation Cygnus. The central star, BD +463474, illuminates the combination emission-reflection nebula.  Extending to the right, is the dark nebula Barnard 168 (B168).  IC 5146 and its associated dark nebula are about 4,000 light years distant. The circular HII region is also catalogued as Sharpless 125.