Celestial hemisphere:  Northern  ·  Constellation: Andromeda (And)  ·  Contains:  Andromeda Galaxy  ·  M 110  ·  M 31  ·  M 32  ·  NGC 205  ·  NGC 221  ·  NGC 224
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Andromeda Galaxy in HaRGB, John Posavatz
Andromeda Galaxy in HaRGB
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Andromeda Galaxy in HaRGB

Getting plate-solving status, please wait...
Andromeda Galaxy in HaRGB, John Posavatz
Andromeda Galaxy in HaRGB
Powered byPixInsight

Andromeda Galaxy in HaRGB

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Description

Taken over the course of 3 evenings, straddling the new moon, in November 2023, from outside of Pittsburgh, PA.

Shot Lum, R, G, B, and Ha each evening, though wound up tossing out the Lum data (it turned out to be unnecessary / didn't really add any detail). 

Post processing all performed in PixInsight:
  1. WBPP
  2. RGB channel combination of R, G, B channels
  3. SPCC color correction
  4. StarXterminator (so I could work on the stars and galaxy separately)
  5. Stretched stars to my liking ... set aside until the final step
  6. DBE, BlurXTerminator, NoiseXTerminator on starless image
  7. Stretched starless image to my liking
  8. Performed a few subtle curve adjustments on masked starless image
  9. Stretched Ha image to my liking
  10. Added Ha to starless image via PixelMath (with Ha also applied as a mask)
  11. Recombined starless + star images via PixelMath

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Andromeda Galaxy in HaRGB, John Posavatz