M31 - Andromeda (wide field) (tavaresjr)

M31 - Andromeda (wide field)

It is my first record of a galaxy (it needs to improve a lot ... hahaha) but the most interesting thing is to know that in this small point we have 1 trillion stars. Stacking just 21 frames using a DSLR with 85mm lens.

M31 is located in the constellation Andromeda and is best observed in November. Boasting an apparent magnitude of 3.1, the galaxy can be seen with the naked eye, even in areas with moderate light pollution. Because it is such an easily observed feature in the night sky, it is impossible to say who discovered the Andromeda galaxy. However, Persian astronomer Abd al-rahman al-Sufi’s The Book of Fixed Stars from the year 964 contains the first known report of the object.

https://www.nasa.gov/feature/goddard/2017/messier-31-the-andromeda-galaxy

The Andromeda Galaxy, 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.

https://en.wikipedia.org/wiki/Andromeda_Galaxy

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Deep sky
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Backyard
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Own remote observatory
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Professional, scientific grade data
Mix of multiple sources
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Status	Advanced success
Started	...
Astrometry.net job	4381649
PixInsight job	8ATWHYIE5SJ68OYAP2VSS1IX5LJFZT16
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	00h57m46s.7
RA (top/left)	00h42m49s.9
RA (top/right)	01h44m36s.7
RA (bottom/right)	01h17m49s.8
RA (bottom/left)	00h11m27s.3

Dec (center)	+43°52′50″
Dec (top/left)	+35°50′44″
Dec (top/right)	+43°28′26″
Dec (bottom/right)	+51°40′06″
Dec (bottom/left)	+43°02′14″

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