Hemisphere:  Northern  ·  Constellation: Andromeda (And)  ·  Contains:  32 And  ·  35 nu. And  ·  Andromeda Galaxy  ·  Andromeda galaxy  ·  M 110  ·  M 31  ·  M 32  ·  M110  ·  M31  ·  M32  ·  NGC 205  ·  NGC 221  ·  NGC 224  ·  NGC206  ·  The star 32And  ·  The star νAnd
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M31 - The Andromeda Galaxy, 


            Vincent Savioz
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M31 - The Andromeda Galaxy

Imaging telescopes or lenses: TS-Optics TS 100 Quadruplet

Imaging cameras: ZWO ASI1600MM-C

Mounts: SkyWatcher EQ6 PRO GOTO

Guiding telescopes or lenses: Orion 80/400

Guiding cameras: Orion Starshoot autoguider

Software: PHD Lab PhD 2 Guiding  ·  Pleyades Astrophoto PixInsight Ripley  ·  Main Sequence Software SGPro  ·  Sequence Generator Pro  ·  Photoshop

Filters: Astrodon R Gen.2 E-series 36mm  ·  Astrodon G Gen.2 E-series 36mm  ·  Astrodon B Gen.2 E-series 36mm  ·  Astrodon L Gen.2 E-series 36mm  ·  Astrodon Ha 3nm 36mm

Accessory: PrimaLuceLab Sesto Senso focuser  ·  ScopeDome 3M  ·  ZWO Filterwheel EFW 7x 36mm

Dates:Aug. 5, 2020Sept. 18, 2020

Astrodon B Gen.2 E-series 36mm: 180x120" (gain: 76.00) -20C bin 1x1
Astrodon G Gen.2 E-series 36mm: 180x120" (gain: 76.00) -20C bin 1x1
Astrodon Ha 3nm 36mm: 220x600" (gain: 76.00) -20C bin 1x1
Astrodon L Gen.2 E-series 36mm: 540x120" (gain: 76.00) -20C bin 1x1
Astrodon R Gen.2 E-series 36mm: 180x120" (gain: 76.00) -20C bin 1x1

Integration: 72.7 hours

Darks: ~50

Flats: ~30

Bias: ~50

Avg. Moon age: 8.87 days

Avg. Moon phase: 49.06%

Bortle Dark-Sky Scale: 4.00

Temperature: 12.50

Astrometry.net job: 3977563

RA center: 0h 42' 7"

DEC center: +41° 18' 52"

Pixel scale: 1.343 arcsec/pixel

Orientation: 90.439 degrees

Field radius: 2.674 degrees

Resolution: 11674x8311

Locations: Home Observatory, Ayent, Valais, Switzerland

Data source: Own remote observatory

Remote source: Non-commercial independent facility


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!



  • M31 - The Andromeda Galaxy, 


            Vincent Savioz
  • Final
    M31 - The Andromeda Galaxy, 


            Vincent Savioz


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

Uploaded: ...

Sky plot

Sky plot


M31 - The Andromeda Galaxy, 


            Vincent Savioz