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Contains:  Cocoon nebula, IC 5146
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Widefield view of the Cocoon Nebula (IC 5146) and Barnard 168, 





    
        

            Luca Marinelli
Widefield view of the Cocoon Nebula (IC 5146) and Barnard 168

Widefield view of the Cocoon Nebula (IC 5146) and Barnard 168

Technical card

Resolution: 4446x3328

Dates:July 7, 2019July 8, 2019July 9, 2019July 10, 2019July 13, 2019July 14, 2019

Frames:
Astrodon Tru-Balance Gen2 E-Series - B 36mm: 100x60" (gain: 50.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - G 36mm: 87x60" (gain: 50.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - R 36mm: 100x60" (gain: 50.00) -20C bin 1x1
Baader Planetarium L 36mm: 857x30" (gain: 50.00) -20C bin 1x1
Astrodon Narrowband 5nm Ha: 91x360" (gain: 139.00) -20C bin 1x1

Integration: 21.0 hours

Darks: ~50

Flats: ~20

Flat darks: ~50

Bias: ~100

Avg. Moon age: 8.59 days

Avg. Moon phase: 60.43%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2824970

RA center: 327.755 degrees

DEC center: 47.496 degrees

Pixel scale: 1.475 arcsec/pixel

Orientation: 170.961 degrees

Field radius: 1.138 degrees

Locations: Home Observatory, Schenectady, New York, United States

Data source: Backyard

Description

The Cocoon Nebula (IC 5146, Sh2-125, Caldwell 19) is a bright emission/reflection nebula in the constellation Cygnus. It is 12 minutes across (the span of 15 light years) and has an apparent magnitude of 7.2. The nebula is approximately 4,000 light years away and is an active stellar nursery with many young stars. The star that lights it is approximately 100,000 years old.

The dark tail that extends westward from IC 5146 is Barnard 168, a dark nebula composed of cold molecular interstellar dust.

My goal with this image was not only to capture the Cocoon but also the surrounding faint hydrogen emissions and the two Ha tails emanating from IC 5146 in particular. I have been fascinated by this region of the sky since I first saw Marcel Drechsler's reference image and wanted to attempt to image the bright signal of the nebula in the context of the surrounding dust and gaseous emissions.

Acquisition with ZWO ASI1600 camera with gain/offset settings 50/20 for LRGB and 139/50 for Ha.

Acknowledgements: I used Starnet++ by Nikita Misiura for star extraction and star de-emphasis technique by Adam Block.

Comments

Author

lucam_astro
Luca Marinelli
License: None (All rights reserved)
4666
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Revisions

  • Widefield view of the Cocoon Nebula (IC 5146) and Barnard 168, 





    
        

            Luca Marinelli
    Original
  • Widefield view of the Cocoon Nebula (IC 5146) and Barnard 168, 





    
        

            Luca Marinelli
    B
  • Widefield view of the Cocoon Nebula (IC 5146) and Barnard 168, 





    
        

            Luca Marinelli
    C
  • Widefield view of the Cocoon Nebula (IC 5146) and Barnard 168, 





    
        

            Luca Marinelli
    D
  • Final
    Widefield view of the Cocoon Nebula (IC 5146) and Barnard 168, 





    
        

            Luca Marinelli
    E

B

Adjusted brightness and contrast.

C

Cocoon brightness and presentation scale.

D

Complete reprocess of the data. Ha was included both in the red channel as well as in the super-luminance.

E

I combined early and late versions in Photoshop using Lighten blending mode to preserve star appearance. A few curve adjustments to improve contrast.

Sky plot

Sky plot

Histogram

Widefield view of the Cocoon Nebula (IC 5146) and Barnard 168, 





    
        

            Luca Marinelli