M92 Globular Cluster
M92 Globular Cluster
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It may not be as big or well known as the other well known cluster in Hercules (M13), but it sure looks nice. Captured over 4 nights in July/August 2024 from a Bortle 9 zone
Places where I host my other images:
- 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: 6 hours 55 minutes (Camera at half Unity Gain, -15°C)
- Lum - 209x60"
- Red - 78x60"
- Green - 62x60"
- Blue - 66x60"
- Flats- 30 per filter
- 24 JimmyFlats per filter
Capture Software:
- Captured using N.I.N.A.
PixInsight Processing:
- BatchPreProcessing (with premade JimmyFlats)
- StarAlignment
- Blink
- ImageIntegration
- DrizzleIntegration (2x, Var β=1.5)
- DynamicCrop
- 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
Luminance:
- BlurXTerminator (correct only mode)
- ArcsinhStretch + histogramtransformation to bring nonlinear
RGB:
- ChannelCombinaiton to combine monochrome R, G, B stacks into color image
- BlurXTerminator (correct only mode)
- SpectroPhotometricColorCalibration
- HSV Repair
- ArcsinhStretch + histogramtransformation to bring nonlinear
- Curves to saturate it a little
- MLT for large scale chrominance noise reduction
Nonlinear:
- LRGBCombination with stretched L as luminance
- DeepSNR Noise reduction
- Several CurveTransformations to adjust lightness, contrast, colors, saturation, etc.
- Invert > SCNR > invert > SCNR to remove some greens and magentas
- More curves
- A little bit of noiseXterminator
- DynamicCrop in on the clustert
- Resample to 75%
- Annotation
