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lefty7283 OP ,
@lefty7283@lemmy.world avatar

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:

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: 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:

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
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