Hemisphere:  Northern  ·  Constellation: Andromeda (And)  ·  Contains:  Andromeda Galaxy  ·  M 31  ·  M 32  ·  NGC 221  ·  NGC 224
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Messier 31 - Andromeda Galaxy - RGB + HA, 



    
        

            Alessandro_ATP
Messier 31 - Andromeda Galaxy - RGB + HA
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Messier 31 - Andromeda Galaxy - RGB + HA

Getting plate-solving status, please wait...
Messier 31 - Andromeda Galaxy - RGB + HA, 



    
        

            Alessandro_ATP
Messier 31 - Andromeda Galaxy - RGB + HA
Powered byPixInsight

Messier 31 - Andromeda Galaxy - RGB + HA

Acquisition details

Dates:
Oct. 28, 2021 ·  Oct. 31, 2021
Frames:
263×180(13h 9′) (gain: 120.00) -10°C bin 1×1
Antlia 3nm Narrowband H-alpha: 17×1200(5h 40′) (gain: 200.00) -10°C bin 1×1
Integration:
18h 49′
Darks:
20
Flats:
20
Flat darks:
20
Avg. Moon age:
23.29 days
Avg. Moon phase:
38.54%
Bortle Dark-Sky Scale:
4.00
Mean SQM:
20.00
Temperature:
5.00

Basic astrometry details

Astrometry.net job: 5914804

RA center: 00h42m46s.3

DEC center: +41°1608

Pixel scale: 1.192 arcsec/pixel

Orientation: 254.635 degrees

Field radius: 0.805 degrees

Resolution: 4041x2706

File size: 4.1 MB

Locations: Osservatorio casa, Sedico, Belluno, Italy

Data source: Backyard

Description

The Andromeda Galaxy, also known as Messier 31M31, or NGC 224 and originally the Andromeda Nebula, is a barred spiral galaxy with diameter of about 220,000 ly approximately 2.5 million light-years (770 kiloparsecs) from Earth and the nearest large galaxy to the Milky Way.[6] 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.The virial mass of the Andromeda Galaxy is of the same order of magnitude as that of the Milky Way, at 1 trillionsolar masses (2.0×1042 kilograms). The mass of either galaxy is difficult to estimate with any accuracy, but it was long thought that the Andromeda Galaxy is more massive than the Milky Way by a margin of some 25% to 50%. This has been called into question by a 2018 study that cited a lower estimate on the mass of the Andromeda Galaxy,=10.5px  combined with preliminary reports on a 2019 study estimating a higher mass of the Milky Way.=10.5px The Andromeda Galaxy has a diameter of about 220,000 ly (67 kpc), making it the largest member of the Local Group in terms of extension.The Milky Way and Andromeda galaxies are expected to collide in around 4-5 billion years,=10.5px  merging to form a giant elliptical galaxy=10.5px  or a large lenticular galaxy.=10.5px  With an apparent magnitude of 3.4, the Andromeda Galaxy is among the brightest of the Messier objects,=10.5px making it visible to the naked eye from Earth on moonless nights,=10.5px even when viewed from areas with moderate light pollution.

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Messier 31 - Andromeda Galaxy - RGB + HA, 



    
        

            Alessandro_ATP