I have been working on OU-4, the Squid Nebula, collecting O3 data to go with the HaLRGB date I acquired last year. I have 13.25 hours of O3 (53x 900s), all accumulated on moonless nights, under
Bortle 3 skies. While I can see the target, I cannot pull it out of the noise. All I can do is stretch it to a very noisy image.
Any ideas for how to get a clean image from this data? Is it hopeless? Do I need even longer subs?
Here is the calibrated, stacked O3 data, with just an STF stretch for visibility, converted to JPG and reduced in size for posting. The unstretched raw XISF master file is at:
https://www.dropbox.com/s/7ypeu4sffixu5 ... .xisf?dl=0
DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope;
Planetary AP: Celestron C-11; ZWO ASI120MC;
Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos;
Etc: Canon 350D; Various EPs, etc.
Obs: 8' Exploradome; iOptron CEM60 (pier);
Helena Observatory (H2O) Astrobin