Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  NGC 7822  ·  Sh2-171
NGC 7822 - Star Forming Region in Cepheus, 



    
        

            lefty7283
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NGC 7822 - Star Forming Region in Cepheus

NGC 7822 - Star Forming Region in Cepheus, 



    
        

            lefty7283
Powered byPixInsight

NGC 7822 - Star Forming Region in Cepheus

Acquisition details

Dates:
Oct. 26, 2020 ·  Oct. 30, 2020 ·  Nov. 2, 2020 ·  Nov. 3, 2020 ·  Nov. 4, 2020
Frames:
Astrodon Ha 31mm 5nm: 102×600(17h) (gain: 139.00) -15°C
Astrodon OIII 31mm 3nm: 21×600(3h 30′) (gain: 139.00) -15°C
Astrodon SII 31mm 5nm: 21×600(3h 30′) (gain: 139.00) -15°C
Integration:
24h
Darks:
30
Flats:
30
Avg. Moon age:
15.19 days
Avg. Moon phase:
90.62%
Bortle Dark-Sky Scale:
6.00

RA center: 00h03m25s.435

DEC center: +67°0910.79

Pixel scale: 0.879 arcsec/pixel

Orientation: -85.697 degrees

Field radius: 1.017 degrees

More info:Open 

Resolution: 6667x5000

File size: 32.7 MB

Data source: Backyard

Description

Been enjoying the hell out of the clear skies recently. Gotten over 100 hours of Deep sky exposure from september through today (This image is exactly 24 hours of exposure time).

**PixInsight Processing:**

* BatchPreProcessing

* SubframeSelector

* StarAlignment

* [Blink](https://youtu.be/sJeuWZNWImE?t=40)

* ImageIntegration

* DrizzleIntegration (2x, Var β=1.5)

**Linear:**

* DynamicCrop

* AutomaticBackgroundExtraction

* [EZ Decon and Denoise](https://darkarchon.internet-box.ch:8443/) (Ha only)

* STF applied via HistogramTransformation to bring each channel nonlinear

**Combining Channels:**

* PixelMath to make classic SHO to RGB image

* Greens and magentas partially nuked using SCNR

* Pixelmath to make RGB image using [ForaxX's palette](https://thecoldestnights.com/2020/06/pixinsight-dynamic-narrowband-combinations-with-pixelmath/)

> R= (Oiii\^~Oiii)\*Sii + ~(Oiii\^~Oiii)\*Ha

> G= ((Oiii\*Ha)\^~(Oiii\*Ha))\*Ha + ~((Oiii\*Ha)\^~(Oiii\*Ha))\*Oiii

> B= Oiii

* Pixelmath to blend classic and ForaxX SHO images 50:50

**Nonlinear:**

* LRGBCombination with Ha as luminance

* Shitloads of [Curve](https://i.imgur.com/eyYJJiB.jpg)Transformations to adjust lightness, saturation, contrast, hues, etc

* SCNR to remove greens

* ACDNR

* LocalHistogramTransformation

* DarkStructureEnhance

* More curves

* DarkStructureEnhance

* EZ Star Reduction

* Slept on the [Version 1 image](https://i.imgur.com/8qvl2pu.png) for a few days, then returned and did further curves to bring it to the current final image

* Resample to 73%

* Annotation

Comments