DWB 111 - The Propeller Nebula (live.staticflickr.com)

submitted 6 months ago by lefty7283@lemmy.world to c/astrophotography@lemmy.world

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[-] lefty7283@lemmy.world 2 points 6 months ago

Probably should've gotten more exposure time on this, but it was already way out of season. Captured over several nights in January 2024, from a Bortle 9 zone

Places where I host my other images:

Flickr | Instagram

Equipment:

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-290mc for guiding
Moonlite Autofocuser

Acquisition: 10 hours 10 minutes (Camera at -15°C), Camera at unity gain.

Ha - 35x360"
Oiii - 31x360"
Sii - 35x360"
L - 200x120"
Darks- 30
Flats- 30 per filter

Capture Software:

Captured using N.I.N.A. and PHD2 for guiding and dithering.

PixInsight Preprocessing:

BatchPreProcessing
StarAlignment
Blink
ImageIntegration per channel
DrizzleIntegration (2x, Var β=1.5)
Dynamic Crop
DynamicBackgroundExtraction

duplicated each image and removed stars via StarXterminator. Ran DBE with a shitload of points to generate background model. model subtracted from original pic using the following PixelMath (math courtesy of /u/jimmythechicken1)

$T * med(model) / model

**Narrowband Linear:

Blur and NoiseXTerminator
Duplicated the images before stretching to be used for separate stars-only processing
STF applied via histogramtransformation to stretch nonlinear

Stars Only Processing:

StarXTerminator to make stars only image form each channel
PixelMath to combine star images (SHO palette)
SpectroPhotometricColorCalibration (narrowband working mode)
SCNR Green
ArcsinhStretch + HT to stretch nonlinear - to be combined later with starless pic

Nonlinear:

PixelMath to combine stretched Ha, Oiii, and Sii images into color image (SHO palette)
Invert > SCNR > invert > SCNR to remove greens and magentas
Shitloads of Curve Transformations to adjust lightness, hues, contrast, saturation, etc
LRGBCombination with stretched Ha as luminance
more curves
NoiseXterminator
LocalHistrogramEqualization (at small and large scales to target varying structures)
MLT for large scale chrominance noise reduction
Extract L --> LRGBCombination for smaller scale chrominance noise reduction
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

(Jimmy is a processing wizard when it comes to writing up this independent starless processing stuff)

mtf(.005,

mtf(.995,Stars)+

mtf(.995,Starless))

more curves
Resample to 60%
Annotation

this post was submitted on 12 Feb 2024

31 points (100.0% liked)

Astrophotography

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