Hemisphere:  Northern  ·  Contains:  NGC 7822  ·  NGC7822  ·  Sh2-171
NGC 7822 - Star Forming Region in Cepheus, 


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NGC 7822 - Star Forming Region in Cepheus

Technical card

Imaging telescopes or lenses: TPO 6" f/4 Newtonian

Imaging cameras: ZWO ASI1600MM-Pro

Mounts: Orion Sirius EQ-G

Guiding telescopes or lenses: Agena 50mm Deluxe Straight-Through Finder / Guide Scope with Helical Focuser

Guiding cameras: ZWO ASI 120 MC

Software: Nighttime Imaging 'N' Astronomy  ·  PixInsight 1.8 Ripley PixInsight

Filters: Astrodon OIII 31mm 3nm  ·  Astrodon Ha 31mm 5nm  ·  Astrodon SII 31mm 5nm

Accessory: ZWO EFW 8 x 1.25″/31mm  ·  Moonlite Model CR Newtonian 2" Format Focuser  ·  SkyWatcher Quattro Coma Corrector

Dates:Oct. 26, 2020Oct. 30, 2020Nov. 2, 2020Nov. 3, 2020Nov. 4, 2020

Astrodon Ha 31mm 5nm: 102x600" (gain: 139.00) -15C
Astrodon OIII 31mm 3nm: 21x600" (gain: 139.00) -15C
Astrodon SII 31mm 5nm: 21x600" (gain: 139.00) -15C

Integration: 24.0 hours

Darks: ~30

Flats: ~30

Avg. Moon age: 15.19 days

Avg. Moon phase: 90.62%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 4019687

RA center: 0h 3' 25"

DEC center: +67° 9' 10"

Pixel scale: 0.879 arcsec/pixel

Orientation: -85.697 degrees

Field radius: 1.017 degrees

Resolution: 6667x5000

Data source: Backyard


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)


* 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


* 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


* 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



License: None (All rights reserved)

Sky plot

Sky plot


NGC 7822 - Star Forming Region in Cepheus,