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And here is the final result of my 2x2 mosaic, 32h of total exposure time (taken over 11 nights)!

The photo is a -color . The red channel of this RGB photo is H-a (Hydrogen-Alpha). Meaning the brighter the red color on a pixel is, the more hydrogen there is at that location. The blue and green (teal) channel are O-III (oxygen). These chemical elements can be filtered with special light filters (narrowband filters).


@photography

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This kind of palette is also called the HOO (analog to RGB) palette, and is used by astronomers to see where and which gases are in a nebula.

The fainter red nebula structures in the background are hydrogen structures inside the galaxy.

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In the lower left corner is also the very faint "soap" nebula, which was only recently discovered (2008) by another hobby astronomer. It only shows up on the O-III data, meaning it is solely made up of oxygen.

This was taken with:
- QHY163m
- Baader 7nm Ha filter
- Astronomik O-III 8nm filter
- RC8" @1125mm f/5.5
- 32h total exposure time, 8h per panel, 4h per channel (Ha and OIII)
- Losmandy G11

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