Celestial hemisphere:  Northern  ·  Constellation: Andromeda (And)  ·  Contains:  35 And  ·  Andromeda Galaxy  ·  M 110  ·  M 31  ·  M 32  ·  NGC 205  ·  NGC 221  ·  NGC 224  ·  The star ν And
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M31 (Andromeda Galaxy) in RGB + Ha + O3, Derek Spratt
M31 (Andromeda Galaxy) in RGB + Ha + O3
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M31 (Andromeda Galaxy) in RGB + Ha + O3

Getting plate-solving status, please wait...
M31 (Andromeda Galaxy) in RGB + Ha + O3, Derek Spratt
M31 (Andromeda Galaxy) in RGB + Ha + O3
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M31 (Andromeda Galaxy) in RGB + Ha + O3

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Description

I have 3 versions of M31 on Astrobin: this image in RGB+Ha+O3, RGB only (see https://www.astrobin.com/w4p1jz/), and RGB_Ha+ (see https://www.astrobin.com/w4sks8/).

Bortle 2 skies - I finally got perfect transparency and seeing conditions at this 5,500' elevation dark sky sight and took 40 x 30s RGB and 30 x 150s Ha and it came out looking better than my prior attempts so I am very happy. 

I wanted to add some more narrowband data to my evolving M31 image after being pleased with the prior addition of Hydrogen-Alpha and this weekend I had the opportunity to grab >4hrs of O3 data (in blue) - it adds another dimension to things - and does a great job of adding contrast and 'pop' to the red Ha regions.

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M31 (Andromeda Galaxy) in RGB + Ha + O3, Derek Spratt