The nebula in the middle of this image doesn't really have a name. [There is a reflection nebula](
https://i.imgur.com/ewf7VK5.jpg) called VdB 130, but it only describes a small part of the nebulosity. Also pretty sure I had some flexure in my rig, which explains the slightly elongated stars. Captured on September 3rd, 10th, and 13th, 2020 from a Bortle 6 zone.
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**[Equipment:](
https://i.imgur.com/6T8QNsv.jpg)**
* TPO 6" F/4 Imaging Newtonian
* Orion Sirius EQ-G
* ZWO ASI1600MM-Pro
* Skywatcher Quattro Coma Corrector
* ZWO EFW 8x1.25"/31mm
* Astronomik LRGB+CLS Filters- 31mm
* Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm
* Agena 50mm Deluxe Straight-Through Guide Scope
* ZWO ASI-120MC for guiding
* Moonlite Autofocuser
**Acquisition:** 13 hours 40 minutes (Camera at Unity Gain, -20°C)
* Ha- 38x600"
* Oiii- 22x600"
* Sii- 22x600"
* Darks- 30
* Flats- 30 per filter
**Capture Software:**
* Captured using [N.I.N.A.](
https://nighttime-imaging.eu/) and PHD2 for guiding and dithering.
**[PixInsight Processing:](
https://i.imgur.com/2Ne9n27.png)**
* BatchPreProcessing
* SubframeSelector
* StarAlignment
* [Blink](
https://youtu.be/sJeuWZNWImE?t=40)
* ImageIntegration
* DrizzleIntegration (2x, VarK=1.5)
**Linear**
* DynamicCrop
* AutomaticBackgroundExtraction
* [EZ Decon/EZ Denoise](
https://darkarchon.internet-box.ch:8443/) (Ha only)
* STF applied via HistogramTransformation for stretching
**Combining Channels:**
* PixelMath to make classic SHO to RGB image
* Green 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 for lum
* Several [Curve](
https://i.imgur.com/UaCnP0p.jpg)Transformations to adjust lightness, hues, saturation, contrast, etc.
* SCNR(a little) > invert > SCNR(a lot)> invert to tone back greens and magentas
* DarkStructureEnhancement
* ACDNR
* LocalHistogramTransformation
* EZ Star Reduction
* Resample to 75%
* Annotation
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