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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 Puyenb...
    IC 5146 - Cocoon Nebula from light polluted skies
    Powered byPixInsight

    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

    Author

    VicV
    Victor Van Puyenb...
    License: None (All rights reserved)
    103013
    Like

    Revisions

      IC 5146 - Cocoon Nebula from light polluted skies, 



    
        

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



    
        

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



    
        

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



    
        

            Victor Van Puyenb...
      D

    B

    Description: Extreme stretch to push faintest signals

    C

    Description: Mix between original and Rev. B

    D

    Description: Blended more Ha in the background

    Sky plot

    Sky plot

    Histogram

    IC 5146 - Cocoon Nebula from light polluted skies, 



    
        

            Victor Van Puyenb...