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NGC 7009 The Saturn Nebula

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About this observation
Observer
Peter Goodhew FRAS
Time of observation
11/08/2019 - 17:03
Object
NGC 7009 The Saturn nebula
Observing location
Fregenal de la Sierra, Spain
Equipment
APM TMB 152 LZOS refractors
QSI6120wsg8 cameras
10Micron GM2000 HPS mount
Exposure
57 hours total integration. HaOIILRGB filters. Exposures varying from 30s bin1 to 1800s bin2
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Before starting an imaging run I now do some test images with different filters, exposures, and binning to see which combinations work best. When I examined the OIII 1800s bin 2x2 test image I was surprised to see an asymmetric outer shell with intricate structures, and so factored this into my image capture plan.  This is the result. There is also a very faint diffuse OIII shell that is even further out from the core.
I found processing this to be a real challenge, with 7 filters, and exposures varying from 30 sec bin 1x1 to 1800s bin 2x2. Integrating images with such extreme dynamic range was also a challenge. I was concerned by some lighter parts of the sky background, but after checking with other images available online it became clear that this was integrated flux nebula.

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