Hemisphere:  Northern  ·  Constellation: Andromeda (And)  ·  Contains:  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 νAnd
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M31, 



    
        

            Joey Troy
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M31

Imaging telescopes or lenses: William Optics Redcat 51

Imaging cameras: Nikon D5500

Mounts: Sky-Watcher EQM 35 Pro

Guiding telescopes or lenses: ZWO 30mm f/4 Mini Guide Scope

Guiding cameras: ZWO ASI 120 Mini Mono

Software: PixInsight

Accessory: ZWO ASiair pro  ·  ZWO EAF


Dates:Jan. 2, 2021Jan. 3, 2021

Frames: 61x300" ISO200

Integration: 5.1 hours

Darks: ~20

Flats: ~20

Bias: ~20

Avg. Moon age: 18.58 days

Avg. Moon phase: 84.19%

Bortle Dark-Sky Scale: 4.00


Astrometry.net job: 4136123

RA center: 0h 43' 5"

DEC center: +41° 11' 26"

Pixel scale: 3.737 arcsec/pixel

Orientation: 160.311 degrees

Field radius: 1.844 degrees


Resolution: 3000x1904

Locations: Backyard, Belen, NM, United States

Data source: Backyard

Description

The Andromeda Galaxy (IPA: /ænˈdrɒmɪdə/), also known as Messier 31, M31, or NGC 224 and originally the Andromeda Nebula (see below), is a barred spiral galaxy approximately 2.5 million light-years (770 kiloparsecs) 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.

The virial mass of the Andromeda Galaxy is of the same order of magnitude as that of the Milky Way, at 1 trillion solar 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, combined with preliminary reports on a 2019 study estimating a higher mass of the Milky Way. 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, if not mass.

The number of stars contained in the Andromeda Galaxy is estimated at one trillion (1×1012), or roughly twice the number estimated for the Milky Way.

The Milky Way and Andromeda galaxies are expected to collide in around 4-5 billion years, merging to form a giant elliptical galaxy or a large lenticular galaxy. With an apparent magnitude of 3.4, the Andromeda Galaxy is among the brightest of the Messier objects, making it visible to the naked eye from Earth on moonless nights, even when viewed from areas with moderate light pollution.

Comments

Revisions

  • M31, 



    
        

            Joey Troy
    Original
  • Final
    M31, 



    
        

            Joey Troy
    C

C

Description: I am not really happy with the original version. I don't feel like my DSLR is doing this object any favors. This new version has been drizzled properly in PI to fix oversampling and to me looks better in mono. I converted it to mono with Luminar AI as I just didn't care for the color version as it's lacking Ha.

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Sky plot

Sky plot

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M31, 



    
        

            Joey Troy