Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 109  ·  NGC 3992
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M109 - 20 March 2017, Geof Lewis
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M109 - 20 March 2017

Getting plate-solving status, please wait...
M109 - 20 March 2017, Geof Lewis
Powered byPixInsight

M109 - 20 March 2017

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Description

Barred spiral galaxy M109. Image shot during a session with moderate continuous winds, sometimes gusting up to 25 mph which certainly tested guiding performance at this scale with the C14 + dew shield acting as a wind sail at times.

Vers B. Here I processed the LRGB data separately, rejecting the worst out of shape star images. Next I processed the L stack using split star processing to work on brightening and sharpening the galaxy without blowing out the stars, then the split stars added back to the image. RGB data was aligned, combined and stretched with noise reduction / smoothing and colour enhancement. Finally the RGB was combined with L and some final tweaks. I may have overdone some of the processing steps, but this is my first LRGB combination where I worked on each data set separately, so on balance I pleased with the result.

Vers C - Same as Vers B plus ran HLVG (strong) in PS (CS2) to reduce green cast in background

Comments

Revisions

  • M109 - 20 March 2017, Geof Lewis
    Original
  • M109 - 20 March 2017, Geof Lewis
    B
  • M109 - 20 March 2017, Geof Lewis
    C
  • Final
    M109 - 20 March 2017, Geof Lewis
    D

C

Description: Vers B + PS(HLVG-S)

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D

Title: Reprocessed using PixInsight.

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M109 - 20 March 2017, Geof Lewis