Bubble Nebula / NGC 7635 from last night

[discardedastro]

Very happy with this as the first image of the season - this was all taken in the one night with my usual 200PDS/ASI183MM rig. About 4 hours overall integration.

Full gory details of capture are on the technical card at https://www.astrobin.com/422916/

Cropped, rotated closeup:

Stars aren't quite perfect in shape but I'm imaging at 0.5"/px to make life difficult for myself. Processing was with PixInsight and followed the "usual" mono LRGB route:

• Calibration - 25 flats, 10 darks (at least)
• Blink
• SubframeSelector with some custom weighting, written to FITS headers
• CosmeticCorrection
• StarAlignment
• LocalNormalization with 256 scale
• ImageIntegration using linear fit/windsorised sigma as appropriate with SubframeSelector weighting
• Crop
• DBE
• DynamicPSF sampling from 300 stars down to 25
• Deconvolution using a local support mask (generated from layers 2-4 of a 5-layer MultiscaleLinearTransform + StarMask with scales wound down and small-scale cranked up appropriately) and the PSF from DynamicPSF
• ChannelRecombination
• BackgroundNeutralization
• PhotometricColorCalibration
• SCNR
• MultiscaleLinearTransform to denoise
• HistogramTransformation
• LRGBCombination w/ chrominance noise reduction
• CurvesTransformation
• TGVDenoise in L*a*b mode