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).


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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.


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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