Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Cocoon Nebula  ·  IC 5146

Image of the day 10/12/2020

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    IC 5146 - Cocoon Nebula from light polluted skies, 



    
        

            Victor Van Puyenbroeck
    IC 5146 - Cocoon Nebula from light polluted skies
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    IC 5146 - Cocoon Nebula from light polluted skies

    Technical card

    Imaging telescopes or lenses: Teleskop-Service ONTC 8" f/4 Newton

    Imaging cameras: ZWO ASI1600MM-Cool

    Mounts: Sky-Watcher EQ6-R Pro

    Guiding telescopes or lenses: APM Mini Guiding Scope 50 mm

    Guiding cameras: ZWO ASI120MM

    Focal reducers: TS-Optics Coma Corrector GPU

    Software: PHD2  ·  PixInsight  ·  EQASCOM  ·  GIMP 2.10.8  ·  Seqence Generator Pro

    Accessory: ZWO EFW 8x31mm


    Dates:May 31, 2020Sept. 18, 2020Sept. 19, 2020

    Frames:
    Astrodon Blue Tru-Balance E-Series Gen 2: 13x300" (gain: 74.00) -15C bin 1x1
    Astrodon Green Tru-Balance E-Series Gen 2: 13x300" (gain: 74.00) -15C bin 1x1
    Astrodon Lum Tru-Balance E-Series Gen 2: 115x180" (gain: 74.00) -15C bin 1x1
    Astrodon Red Tru-Balance E-Series Gen 2: 13x300" (gain: 74.00) -15C bin 1x1
    Astrodon Tru-Balance 1.25" 3nm HA: 24x600" (gain: 200.00) -15C bin 1x1

    Integration: 13.0 hours

    Darks: ~30

    Flats: ~20

    Flat darks: ~100

    Avg. Moon age: 4.14 days

    Avg. Moon phase: 24.40%

    Bortle Dark-Sky Scale: 7.00


    Basic astrometry details

    Astrometry.net job: 3897737

    RA center: 21h 53' 13"

    DEC center: +47° 14' 13"

    Pixel scale: 0.979 arcsec/pixel

    Orientation: 1.573 degrees

    Field radius: 0.637 degrees


    Resolution: 2804x3756

    Locations: Backyard, Herent, Belgium

    Data source: Backyard

    Description

    This image really pushed me out of my comfort zone, as I've never processed dark nebula before. Due to my light pollution, I am used to processing mostly narrow band images and a couple bright galaxies with lots of empty space around them for easy background correction.

    If I went too far with the stretch and/or amount of noise reduction, please let me know. I really have no idea what to expect given the data quality and I am open to suggestions for improvement. The data is a combination of LRGB acquired during new Moon period when the object was close to zenith, and H-alpha data which I captured before summer. A link to my FITS files can be found below the image title.

    Original: LRGB without luminance noise reduction
    Rev. B: HaLRGB processed with Starnet++ and an extreme stretch of the background with Power of Inverted Pixels (PIP) + MLT noise reduction.
    Rev. C/D: toned down versions of Rev. B, mixed in the original LRGB + Ha.

    The large scale details seem to be correct when I compare my data to deep reference images from dark skies. I was really surprised to see that.

    Ps.: If you look closely, a couple small background galaxies can be seen through the dust (left side, below the bright star in the middle). Thanks to Abin user Meeus

    Comments

    Revisions

      IC 5146 - Cocoon Nebula from light polluted skies, 



    
        

            Victor Van Puyenbroeck
      Original
      IC 5146 - Cocoon Nebula from light polluted skies, 



    
        

            Victor Van Puyenbroeck
      B
      IC 5146 - Cocoon Nebula from light polluted skies, 



    
        

            Victor Van Puyenbroeck
      C
    • Final
      IC 5146 - Cocoon Nebula from light polluted skies, 



    
        

            Victor Van Puyenbroeck
      D

    B

    Description: Extreme stretch to push faintest signals

    Uploaded: ...

    C

    Description: Mix between original and Rev. B

    Uploaded: ...

    D

    Description: Blended more Ha in the background

    Uploaded: ...

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    IC 5146 - Cocoon Nebula from light polluted skies, 



    
        

            Victor Van Puyenbroeck