An emission nebula in the constellation Canis Major; about 12,000 light-years away. Consists largely of interstellar gas swept up by the central star, and partly of material from the star itself, which is an extremely hot, massive Wolf-Rayet star in a short-lived pre-supernova stage.
Image capture with Celestron C-11 scope @f/6.3 on Astro-Physics 1200 GTO mount, ZWO ASI1600MM camera with Astrodon filters; guiding with Mini-Borg 50 and Starlight Xpress Ultrastar guide camera
Settings:
Luminance, Red, Green and Blue - 10 exposures each @5 minutes, bin 1x1
Notes:
Image capture software - Sequence Generator Pro, guiding with PHD2; calibration, stacking and final processing with PixInsight, Adobe Photoshop CC and Russell Croman's StarShrink plugin