We've added another 13 half-hour subs in SII to our previous Eagle going back many years, to yield a total of:
Red: SII 18hrs 30 min
Green: H-alpha 4 hrs
Blue: OIII 10 hrs
BIG ONE HERE
Mixture of Aspen CG16M and FLI PL16803 cameras on 20 inch PlaneWave.
Processing was:
Deconvolution
Separate into stars and nebulosity
Stars to monochrome
Nebulosity: Balance colour, wavelet sharpen, brighten the darks
Recombine stars and nebulosity
We were particularly interested to see to what extent SII (red) was just co-localized with H-alpha (green). There are several distinct diagonal bands of thin, not-so-bright diagonal bands of SII in the bottom left corner, and the huge "pineapple donut" or "millstone" structure at top right has a thin rim which is relatively strong in SII.
(We attempted doing another night of H-alpha last night, but the half-moon was ramming straight down the barrel, and we got a Moonlight Sonata. Tonight would be even worse. So that's it for this month.)
EDIT: We now have added 90 minutes per channel of RGB stars. Technique: Separate RGB into stars and starless. Take brighter of RGB stars and starless SHO. All done using our own GoodLook.
BIG ONE HERE.
Best,
Mike and Trish