Finally going through my processing backlog! I tried to get some Ha on this from home, but I had too many obstructions to shoot at this declination. Decided to keep this as a wider crop since most the images of this I see are cropped in on just the nebula itself. Captured captured on November 23rd, 2025 from a Bortle 3 zone (deerlick astronomy village).
Places where I host my other images:
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TPO 6" F/4 Imaging Newtonian
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Orion Sirius EQ-G
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ZWO ASI1600MM-Pro
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Skywatcher Quattro Coma Corrector
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ZWO EFW 8x1.25"/31mm
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Astronomik LRGB+CLS Filters- 31mm
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Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm
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Agena 50mm Deluxe Straight-Through Guide Scope
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ZWO ASI-290mc for guiding
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Moonlite Autofocuser
Acquisition: 10 hours 12 minutes (Camera at unity gain, -15°C)
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L - 97x180"
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R - 37x180"
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G - 36x180"
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B - 34x180"
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Darks- 30
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Flats- 30 per filter
Capture Software:
- Captured using N.I.N.A. and PHD2 for guiding and dithering.
PixInsight Preprocessing:
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BatchPreProcessing
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StarAlignment
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Blink
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ImageIntegration per channel
The luminance data was split into 3 stacks and combined to use the single channel DeepSNR method
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DrizzleIntegration (2x, Var β=1.5)
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Dynamic Crop
Luminance linear:
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MultiscaleGradientCorrection using MARS Project data
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BlurXterminator
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StarXterminator to completely remove stars (extracted stars processed separately)
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STF applied via HistogramTransformation to stretch nonlinear
RGB Linear:
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Channelcombination to make color image from RGB stacks
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MultiscaleGradientCorrection
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SpectrophotometricColorCalibration
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BlurX (correct only mode)
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StarX to remove stars (to be used for star addition later)
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StarX to extract a stars only image
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ArcsinhStretch + HistogramTransformation to stretch nonlinear
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Slight curves saturation boost and histogram adjustments
Stars only image:
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HSV repair
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ArcsinhStretch + HistogramTransformation to stretch nonlinear (less aggressive stretch)
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Slight curve adjustments
Nonlinear Processing
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LRGBCombination to combine stretched RGB and L images
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DeepSNR Noise reduction
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Shitloads of curve transformations to adjust luminance, contrast, saturation, etc
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More curves
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NoiseXTerminator for some small scale chrominance noise reduction
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LocalHistogramTransformation
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Even more curves
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ColorSaturation adjustments (get rid of some background greens)
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Pixelmath to add in the stretched stars only image from earlier
This basically re-linearizes the two images, adds them together, and then stretches them back to before. More info on it here)
mtf(.005,
mtf(.995,Stars)+
mtf(.995,Starless))
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Resample to 60%
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Annotation