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

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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:

• Captured using N.I.N.A.

PixInsight Processing:

• BatchPreProcessing

• 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

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