The Swan M17 NGC 6618

[kaymann]

Celestron C9.25 - HyperStar (Tilt Adjusted and Culminated) f/2.2 (525mm)
ZWO ASI533MC Pro - Brightness (Offset) 10, Gain 105 (Unity 100), Cooled to 0°C
Askar 50mm Guide Scope - ZWO ASI290mm Mini
PHD2 - 3 Second (New Dark Library) & Recent Calibration
SC - (ASTAP - Plate solve, Center, & Sync), Live Stack, Save All, Master Bias Flat = Yes, Master Dark = Yes
ASTAP - Preprocess Stack Analyze 30% Reject Rate, Stack to Master FITS
Siril - Background Extraction, Photometric Color Calibration, Green Noise Removal, StarNet Starless Master and Star Mask, Asinh & Histogram Stretch on Starless, Starless Saturation, StarNet Star Recomposition (Star Negative Stretch), Lighter touch on the Background Extraction and heavier on Star Mask.
Darktable - Copyright and minor contrast, export PNG

Let's see if the background holds up this time (JPG)

20230630-061030-20230628-094616-Final DT Star Starless M17 NGC 6618 SwanSmllrSML.jpg (97.79 KiB) Viewed 6126 times

[Menno555]

So cool to see the more southern hemisphere objects. Nice job
The less dark background indeed looks better here, there is more balance in the overall image.

Menno

[timh]

Very nice. Only seen M17 myself once from here in the UK low down in the South -- and that visually from a dark sky site in south devon. Tim