NGC 5634 is a globular cluster about 80k lightyears away from us. It’s pretty small compared to other globs like M13. I only spent an hour on this while waiting for other targets to come up the last time I was at a dark site. Captured on June 7th, 2024 from a Bortle 3 zone (Deerlick Astronomy Village)
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
Nonlinear:
LRGBCombination with stretched L as luminance
DeepSNR Noise reduction
Invert > SCNR > invert > SCNR to remove some greens and magentas
Several CurveTransformations to adjust lightness, contrast, colors, saturation, etc.
NGC 5634 is a globular cluster about 80k lightyears away from us. It’s pretty small compared to other globs like M13. I only spent an hour on this while waiting for other targets to come up the last time I was at a dark site. Captured on June 7th, 2024 from a Bortle 3 zone (Deerlick Astronomy Village)
Places where I host my other images:
Instagram | Flickr
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-120MC for guiding
Moonlite Autofocuser
Acquisition: 1hour 3 minutes (Camera at half Unity Gain, -15°C)
Lum - 24x90"
Red - 6x90"
Green - 6x90"
Blue - 6x90"
Flats- 30 per filter
Capture Software:
PixInsight Processing:
BatchPreProcessing
StarAlignment
Blink
ImageIntegration
DrizzleIntegration (2x, Var β=1.5)
DynamicCrop
DynamicBackgroundExtraction
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
Nonlinear:
LRGBCombination with stretched L as luminance
DeepSNR Noise reduction
Invert > SCNR > invert > SCNR to remove some greens and magentas
Several CurveTransformations to adjust lightness, contrast, colors, saturation, etc.
HistogramTransformations
More curves
DynamicCrop in on the clustert
Resample to 80%
Annotation
Thanks for including all the post processing details.