M31 - The Andromeda Galaxy (Vincent Savioz)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: 32 And · 35 nu. And · Andromeda Galaxy · M 110 · M 31 · M 32 · NGC 205 · NGC 206 · NGC 221 · NGC 224 · The star 32And · The star νAnd

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M31 - The Andromeda Galaxy

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M31 - The Andromeda Galaxy

The Andromeda Galaxy also known as Messier 31, M31, or NGC 224 and originally the Andromeda Nebula, is a barred spiral galaxy approximately 2.5 million light-years from Earth and the nearest major galaxy to the Milky Way. The galaxy's name stems from the area of Earth's sky in which it appears, the constellation of Andromeda, which itself is named after the Ethiopian (or Phoenician) princess who was the wife of Perseus in Greek mythology.

Source: Wikipedia

During this autumn, I decided to go big with a 9-panel mosaic of the M31 region. At first, I wanted to show the Ha clouds surrounding the galaxy but quickly abandoned the idea. After more than 10 hours on a panel and no sign of nebulosity, I realized that this will take me years to come to a result. So, I finished the project and used the Ha to enhance nebulae contained in M31. The guider messed up and I had to disable dithering… There is a lot of walking noise on a few lower frames.

This picture is the result of several post-processing iterations. I always struggle with LRGB. If someone knows or uses a good tutorial, please tell me its name!

Zoom in, enjoy! Criticism and advice are welcome!

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Description: Reduce halos around stars, resaturate every element in the image using range and star masks generated with PixInsight.

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Deep Sky Mosaics
Imagers of Switzerland
The refractors!

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Status	Advanced success
Started	...
Astrometry.net job	3977563
PixInsight job	6M1RD46CBZI5XNOTFXYWZTNMVGLDG2NN
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	00h42m07s.67
RA (top/left)	00h50m01s.54
RA (top/right)	00h50m44s.98
RA (bottom/right)	00h33m39s.84
RA (bottom/left)	00h34m03s.14

Dec (center)	+41°18′52″.0
Dec (top/left)	+39°06′38″.10
Dec (top/right)	+43°27′32″.4
Dec (bottom/right)	+43°29′10″.0
Dec (bottom/left)	+39°07′45″.6

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M31 - The Andromeda Galaxy

M31 - The Andromeda Galaxy

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M31 - The Andromeda Galaxy

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