Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  Extremely wide field
Cassiopeia on the Heart and Soul Nebula, Jonathan W MacCollum
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Cassiopeia on the Heart and Soul Nebula, Jonathan W MacCollum
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Equipment

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Acquisition details

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Description

Cassiopeia centered on the Heart and Soul Nebula

Astronomik L3 Filter
ASI071mc
Voigtlander Ultron 40mm f2 
153x6m at Gain 0 offset 65

Processing Steps:
* Calibrated (Darks, Flats, Dark Flats), Weighted and Aligned the best subs, tossing those with high clouds
* Stacked the best 30 subs from the hightest altitude where minimum gradients existed and used as a Local Normalization reference
* Applied local normalization to all 153x6 subs, and stacked using ESD and Large Scale Pixel Rejection
* Drizzled 2x using CFA Drizzle
* Performed a starless DBE to model the background, subtracting it from the full image
* Generalized Hyberbolic Stretch:
 - Bring the black point in without clipping
 - Stretch in RGB mode using local intensity of 5 and stretch of 4
 - Stretch in Color mode using local intensity of -1 and stretch of 2.5
 - Stretch in Saturation mode using local intensity of -2 and stretch of 2.6
* Created a contours based star mask then used erosion of morphological transform to reduce the impact of the stars
* Ran deconvolution on the star cores
* Additional GHS contrast based stretches in RGB and linear to bring the black point in further
* Additional round of morphological transformation in selection selection to further reduce the impact of the stars
* Increase contrast in medium and large scale features using Multiscale Median transformation, adjusting the Bias on wavelet layers 6-12 with a star mask in place
* Chrominance Noise reduction using ACDNR on the dark regions

Comments

Sky plot

Sky plot

Histogram

Cassiopeia on the Heart and Soul Nebula, Jonathan W MacCollum