Contains:Cocoon nebula, IC 5146
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IC 5146 The Cocoon Nebula, 




    

        Göran Nilsson
IC 5146 The Cocoon Nebula

IC 5146 The Cocoon Nebula

Technical card

Resolution: 3883x2665

Dates: Sept. 13, 2018

Frames: 81x300"

Integration: 6.8 hours

Avg. Moon age: 4.06 days

Avg. Moon phase: 17.52%

Astrometry.net job: 2253764

RA center: 327.959 degrees

DEC center: 47.275 degrees

Pixel scale: 1.261 arcsec/pixel

Orientation: 351.078 degrees

Field radius: 0.825 degrees

Locations: Home Observatory, Hole, Värmland, Sweden

Data source: Backyard

Description

The Cocoon Nebula is in the constellation of Cygnus (the Swan) and is about about 4,000 ly away, and the central star that lights it formed about 100,000 years ago. The nebula span about 15 light years. The dark nebula Barnard 168 (B168) forms a dusty lane that surrounds the Cocoon Nebula and projects westward forming the appearance of a trail.

This is my third target using my new ASI071. The object was near zenith, no visible clouds or moon, and a nice Milky Way accross the sky. My SQM showed 21.1. Even guiding was good (0.5"RMS). But, for some reason I ended up the a very strong green tint on all the subs. After much tweaking with colour curves and other colour adjustments in PS I finally reached a presentable image but it was a heck of a job and I initially gave up for a while.

If anyone know why all my subs were green, I love to know so I can prevent it. I did use the correct bayer matrix (RGGB) when I debayered the subs in PI, and the only thing I know I changed from previous sessions was to increase offset from 20 to 30. Gain was 200.

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Author

gorann
Göran Nilsson
License: None (All rights reserved)
750
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  • IC 5146 The Cocoon Nebula, 




    

        Göran Nilsson
    Original
  • IC 5146 The Cocoon Nebula, 




    

        Göran Nilsson
    B
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        Göran Nilsson
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  • Final
    IC 5146 The Cocoon Nebula, 




    

        Göran Nilsson
    D

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IC 5146 The Cocoon Nebula, 




    

        Göran Nilsson