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Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  1 Cyg)  ·  1 kap Cyg  ·  10 Cyg  ·  10 iot Cyg  ·  10 nu. Cep  ·  11 Cyg  ·  12 Cep  ·  13 tet Cyg  ·  14 Cyg  ·  15 Cyg  ·  16 c Cyg  ·  17 Cyg  ·  18 Cyg)  ·  18 del Cyg  ·  19 Cyg  ·  2 tet Cep  ·  20 d Cyg  ·  21 eta Cyg  ·  22 Cyg  ·  23 Cyg  ·  24 psi Cyg  ·  25 Cyg  ·  26 e Cyg  ·  27 b01 Cyg  ·  28 b02 Cyg  ·  29 b03 Cyg  ·  3 Cep)  ·  3 eta Cep  ·  30 Cyg  ·  31 omi01 Cyg  ·  And 706 more.
Northern Summer Milky Way, Jonathan W MacCollum
Northern Summer Milky Way, Jonathan W MacCollum

Northern Summer Milky Way

Link: https://darkflats.com/Widefield/Cygnus/Northern%20Summer%20Milky%20Way.html
Link to TIFF/FITS: https://darkflats.com/Widefield/Cygnus/Cygnus%20near%20Sh2-115.L3.95x360s.ESD.LN.LSPR.Drizzled.2x.PCC.QuickEdit.jpg
Northern Summer Milky Way, Jonathan W MacCollum
Northern Summer Milky Way, Jonathan W MacCollum

Northern Summer Milky Way

Link: https://darkflats.com/Widefield/Cygnus/Northern%20Summer%20Milky%20Way.html
Link to TIFF/FITS: https://darkflats.com/Widefield/Cygnus/Cygnus%20near%20Sh2-115.L3.95x360s.ESD.LN.LSPR.Drizzled.2x.PCC.QuickEdit.jpg

Equipment

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Acquisition details

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Description

The Northern Milky Way is home to a great number of my favorite deep sky objects, but often times I like to step back and take a look at where they all sit amongst the summer sky.  In this image we can see all the dark molecular clouds that sit between Cepheus and Cygnus, the bright North American nebula, and much more!

Gear:
* Voigtlander 40mm Nokton f2 stopped to f5.6
* Geoptik Nikon Adapter
* ASI071mc Pro cooled to -0C at Gain 0 offset 65

Acquisition:
* 97x6m at Gain 0 offset 65 across four nights in October 2022

PreProcessing Steps:
* Blink and toss subs with bad clouds or high LP gradients (leaving subs with satellites and plane trails in)
* Calibrate all subs using Flats from corresponding nights, Dark Flats and Darks
* Cosmetic Correction to target remaining hotpixels
* Subframe Selector using PSFSignalWeight weighting, rejecting subs with high trailing
* Debayer (VNG)
* Star Alignment
* Local Normalization (using WBPP's interactive method to build a reference using the best 16 exposures
* Image Integration using ESD and Large Scale Pixel Rejection High
* Drizzle Integration 2x Drop Shrink 0.9 Variable Kernal 1.5 and CFA Drizzle

Processing Steps:
* Photometric Color Calibration (PCC) using Average Spiral Galaxy as white reference
* No Background modeling (wasn't necessary)
* TGV Denoise linear using John Rista technique (Low contrast mask, local support and careful on the edge protection... didn't need much)
* Histogram Transformation to stretch
* Reduced the astigmatism in the stars by subtracting L from an expanded starmask (to model the contours) and morphological minimum/erosion
* GHS Color stretch and Saturation Stretch to bring out the colors
* Dark Structure Enhance to add contrast to the dark molecular clouds
* Light SCNR Green to reduce the slight green tint.

Comments

Revisions

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    Northern Summer Milky Way, Jonathan W MacCollum
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Title: Annotated

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Northern Summer Milky Way, Jonathan W MacCollum
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