this post was submitted on 23 Jul 2024
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Astrophotography

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[–] lefty7283 3 points 4 months ago (1 children)

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

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

[–] Gnomie 3 points 4 months ago

Thanks for including all the post processing details.