this post was submitted on 14 Aug 2024
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M92 Globular Cluster [OC] (live.staticflickr.com)
submitted 3 months ago by [email protected] to c/[email protected]
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[–] [email protected] 7 points 3 months ago

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