This is my image of the Triangulum Galaxy, Messier 33, which I captured on Nov 25 2017 and earlier using my C-11 SCT and ATIK460EX camera.  Please note the many red H-II regions interspersed throughout the spiral arms of the galaxy; these regions were formed by the light from hot young blue stars having sufficient energy to ionize hydrogen into separated protons and free electrons; when the electrons re-combine with the protons they emit a pulse of light having a red wavelength of 6563 Angstroms which is why the H-II regions appear as a shade of red.

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I captured M33 over 7 nights in November 2017 using LRGB color filters and a 3nm H-alpha filter on the following dates; please note the exposure times for each filter and the number of frames per filter on the dates specified. Also I integrated the data for 45 Luminance frames that I captured last year on Dec 30 2016 :

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Luminance: Nov 15 2017 -- 38x2mins= 76mins 
Luminance: Nov 21 2017 -- 50x2mins= 100mins
Luminance: Dec 30 2016 -- 45x2mins= 90mins
Red: Nov 10 2017 -- 32x2mins= 64mins
Red: Nov 24 2017 -- 53x2mins= 106mins
H-alpha: Feb 15 2017 - 7x15mins= 105mins 
Green: Nov 11 2017 -- 44x2mins= 88mins
Blue: Nov 20 2017 -- 43x2mins= 86mins
Blue: Nov 25 2017 -- 56x2mins= 112mins

Total Integration Time = 737 minutes = 12.3 hours

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In addition to the C-11 SCT I used an ATIK460EX main imaging camera, a Lodestar X2 guide camera, an On Axis Guider (ONAG), an F/6.3 Reducer, a Starlight Instruments motorized programmable focuser control system, all components supported on a Losmandy

G-11 mount controlled by a Gemini 2 mount controller.