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Thoughts on this Spaghetti Nebula Mosiac

Jon Pither
edited April 15 in PixInsight
Hey,

I've been working on this 6 panel mosaic for some time. Shooting in narrowband only (for now) with a full-frame asi6200mm, with Drizzle 2x.

Each panel has about 30 X 10 min subs for each SHO channel, so about 5 hours. The whole thing has about 60 hours.

I ended up with a workflow of minimally processing each tile ahead of stitching:
  • ChannelCombination of SHO
  • BlurX (correct only)
  • Resample (to 50% of original size)
Then I used MosiacByCoordinates followed by PhotometricMosciac. It all went really well, and I didn't change any of the PM settings.

I then:
  • ChannelExtraction to pull out S H O images and saved them to disk
  • ImageIntegration to create a Synthetic Luminence
  • Separated the stars using SX on both the mosiac SHO and the newly formed L
  • Lightly stretched both SHO and L starless images using STF and HistogramTransformation
  • LRGB to combine the SHO and L
From there I used NarrowbandNormalisation, GHS, CurvesTransformation, using a GAME mask on the little nebula to the right to protect it.

This is a faint target and needs a good of stretching to brighten up. The target has disappeared now for me this year, but I was experimenting with grabbing some RGB data also, and I tested that I could create two mosaics SHO & RGB, then merge the two. I used a script CombineRGBandNarrowband and it seemed to go well.

I'd be interested in any thoughts and feedback on this image. I've a hunch that I need more data, and the stars would look better with RGB (am using Seit Astro NB to RGB Star combination).

I have to concede that although I'm shooting from a dark sky site, there's something up with the tracking, possibly a tilt issue, that means the 10 min subs had a degree of stretched / streaky stars. BX did a commendable job of fixing, but still..

I'd be interested in any ideas to improve, even using a different palette / approach to SHO. I think I've made an OK image, but maybe not the final image I'm looking for.

Thanks for reading!

I'm having trouble with uploading an image currently to this post - here's the image for now: https://drive.google.com/file/d/1zPFO4h_5yurM8UxoVf4_HopkjVGN-zE_/view
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