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Large Dark Nebula 1472 and 1448 in Perseus/Aries with NGC1333, Jonathan W MacCollum
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Large Dark Nebula 1472 and 1448 in Perseus/Aries with NGC1333

Large Dark Nebula 1472 and 1448 in Perseus/Aries with NGC1333, Jonathan W MacCollum
Powered byPixInsight

Large Dark Nebula 1472 and 1448 in Perseus/Aries with NGC1333

Equipment

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Acquisition details

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Description


Large Dark Nebula 1472 and 1448 in Perseus/Aries with NGC1333



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Equipment:


* CGEM

* Rokinon 135mm f2 at f2

* asi071mc PRO at -15 C

* Astronomiks L3 UV/IR filter

* AF3 by Deep Sky Dad


Acquisition:


* 101x120s at unity gain


The resulting image is a combination of the following steps:


    [li]
    Inspected all subs for bad images with Blink, discarding subs containing clouds
    [/li]

    [li]
    Calibrated all subs with a master flat and master dark
    [/li]

    [li]
    Used subframe selector to weight all images based on the following weighting
    [/li]


(10*(1-(FWHM-FWHMMin)/(FWHMMax-FWHMMin))

+ 20*(1-(Eccentricity-EccentricityMin)/(EccentricityMax-EccentricityMin))

+ 30*(1-(Median-MedianMin)/(MedianMax-MedianMin))

+ 10*(SNRWeight-SNRWeightMin)/(SNRWeightMax-SNRWeightMin)

+ 10*(Stars-StarsMin)/(StarsMax-StarsMin))

+ 30

    [li]
    Selected the best sub from subframe and blink to use as a reference frame for aligning and integration
    [/li]

    [li]
    Cropped the stacking edges of the integrated image
    [/li]

    [li]
    Dynamic Background Extraction
    [/li]

    [li]
    Background Neutralization using 5 small preview windows aggregated as a background reference
    [/li]

    [li]
    Color Calibration |> Solved |> Photometric Color Calibration
    [/li]

    [li]
    RGBWorking Space to 1,1,1
    [/li]

    [li]
    Noise Reduction was done using TGV Denoise with a low contrast mask and an autostretched local support and MMT with a very protective luminance mask
    [/li]

    [li]
    Green color cast was removed with SCNR
    [/li]

    [li]
    Blown out star colors were repaired with the HSV Repair Separation script
    [/li]

    [li]
    Stretched using Masked Stretch followed by Histogram Transformation
    [/li]

    [li]
    Stars in this image were reduced by using morphological transformation on a countours based mask created with the following steps:


      [li]
      Extract a luminance, use MLT to remove layer 1 and the residual layer of 6 layers
      [/li]

      [li]
      Binarize the image using the preview window until only stars, and no structure from the DSO NGC 1579 was left in the mask
      [/li]

      [li]
      Expand the mask using MTL in Maximize mode: amount 1
      [/li]

      [li]
      Convolve the image to soften the star mask's edges
      [/li]

      [li]
      Subtract the largest stars from the mask so to only target medium sized and smaller sized stars
      [/li]

      [li]
      Subtract another copy of the luminance from the resulting star mask, leaving the contoured profiles of the stars from the luminance
      [/li]
    [/li]

    [li]
    Curves transformation was used to increase contrast and saturation with a luminance mask to prevent oversaturation on the stars.
    [/li]

    [li]
    Removed magenta color from background by inverting->scnr green with a luminance mask-> re-inverting
    [/li]

    [li]
    Additional round of Noise Reduction using TGV, ACDNR and Multiscale Median
    [/li]

Comments

Sky plot

Sky plot

Histogram

Large Dark Nebula 1472 and 1448 in Perseus/Aries with NGC1333, Jonathan W MacCollum

In these public groups

ASI 071 mcc
Samyang 135 f/2
Cooled Color Cams
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