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JPROSS

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  1. How is the artifact oriented with respect to the ground? Thermal plume effects, either from a warm floor or from the OTA itself if it's not been allowed to cool, can look like that. If you look at a defocused star in live view it will be immediately obvious if it's thermal plume.
  2. That's coming along rather well now Funnily enough adding Ha might bring out more of the red/pink you were looking for! I usually apply background correction to the individual channels before combining - my reasoning is that light pollution/moonlight etc gradients will change over the night so RGB and L can all have quite different backgrounds to remove. The more complicated the background gradient the harder it is to model and remove, so I think it makes sense to try and tackle the individual channels rather than trying to model the whole thing at once. You can always run ABE or DBE again on the color composite to clean up any residual colour gradients. You probably already know about them, but when I started with Pixinsight I found the tutorials at https://www.lightvortexastronomy.com/tutorials.html very helpful.
  3. How are you doing the colour calibration in PI, and how are you adding the Ha data? E.g. are you just using the colour calibration process and adding Ha to the red channel or something more exotic? I'm not sure if it's just another issue of exporting to jpg but it looks like there are stacking artefacts that need cropped on the bottom, with some funny looking (light pollution?) gradients across the image too. I don't know precisely what an uneven background would do to the colour calibration process but I can't imagine it is good. Have you run the individual channels through DBE before combining?
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