Hemisphere:  Northern  ·  Constellation: Andromeda (And)  ·  Contains:  Great Nebula in Andromeda  ·  M 110  ·  M 31  ·  M 32  ·  NGC 205  ·  NGC 221  ·  NGC 224
M31 The Great Andromeda Galaxy, 


            Paul Winn
M31 The Great Andromeda Galaxy
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M31 The Great Andromeda Galaxy

Technical card

Imaging telescopes or lenses: Astro-Tech AT90EDT

Imaging cameras: QHYCCD QHY8

Mounts: Orion Atlas EQ-G

Guiding telescopes or lenses: ORION 80MM SHORT TUBE

Guiding cameras: Orion StarShoot Autoguider

Software: Stark Labs Nebulosity 3.2  ·  MaxIm DL Pro 5  ·  Deep Sky Stacker 3.3.4 deepskystacker  ·  Adobe Photoshop

Accessory: Robofocus RF3 Controller

Dates:July 7, 2010

Frames: 12x600" (2h)

Integration: 2h

Avg. Moon age: 24.90 days

Avg. Moon phase: 22.39%

Basic astrometry details

Astrometry.net job: 184801

RA center: 0h 42' 49"

DEC center: +41° 15' 32"

Pixel scale: 2.680 arcsec/pixel

Orientation: -74.542 degrees

Field radius: 1.353 degrees

Resolution: 620x406

Locations: Mt Pinos, Frazier Park, California, United States


The Andromeda Galaxy /ænˈdrɒmɨdə/ is a spiral galaxy approximately 2.5 million light-years (2.4×1019 km) from Earth in the Andromeda constellation. Also known as Messier 31, M31, or NGC 224, it is often referred to as the Great Andromeda Nebula in older texts. The Andromeda Galaxy is the nearest spiral galaxy to our Milky Way galaxy, but not the closest galaxy overall. It gets its name from the area of the sky in which it appears, the constellation of Andromeda, which was named after the mythological princess Andromeda. The Andromeda Galaxy is the largest galaxy of the Local Group, which also contains the Milky Way, the Triangulum Galaxy, and about 30 other smaller galaxies. Although the largest, the Andromeda Galaxy may not be the most massive, as recent findings suggest that the Milky Way contains more dark matter and could be the most massive in the grouping. The 2006 observations by the Spitzer Space Telescope revealed that M31 contains one trillion (1012) stars: at least twice the number of stars in the Milky Way galaxy, which is estimated to be 200–400 billion.


Sky plot

Sky plot


M31 The Great Andromeda Galaxy, 


            Paul Winn