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The Andromeda Galaxy is a barred spiral galaxy and is the nearest major galaxy to the Milky Way. It was originally named the Andromeda Nebula and is cataloged as Messier 31 , M31 , and NGC 224 . Andromeda has a D 25 isophotal diameter of about 46.56 kiloparsecs (152,000 light-years ) [ 8 ] and is approximately 765 kpc (2.5 million light-years ...
While magnitude generally refers to a measurement in a particular filter band corresponding to some range of wavelengths, the apparent or absolute bolometric magnitude (m bol) is a measure of an object's apparent or absolute brightness integrated over all wavelengths of the electromagnetic spectrum (also known as the object's irradiance or ...
Distance moduli are most commonly used when expressing the distance to other galaxies in the relatively nearby universe.For example, the Large Magellanic Cloud (LMC) is at a distance modulus of 18.5, [2] the Andromeda Galaxy's distance modulus is 24.4, [3] and the galaxy NGC 4548 in the Virgo Cluster has a DM of 31.0. [4]
It is commonly used by stargazers to find the Andromeda Galaxy. The galaxy NGC 404, also known as Mirach's Ghost, is seven arcminutes away from Mirach. [16] This star has an apparent visual magnitude of around 2.07, [1] varying between 2.01 and 2.10, [2] which at times makes it the brightest star in the constellation.
Therefore, the galaxy will be harder to see than the star against the airglow background light. Apparent magnitude is a good indication of visibility if the object is point-like or small, whereas surface brightness is a better indicator if the object is large.
AE And was the brightest star in M31 when it was first noticed during an outburst, at an apparent magnitude around 15, equivalent to an absolute magnitude of −10.2, or around a million times brighter than the Sun. This implies that the outburst may have increased the luminosity of the star, which would be unusual for an LBV.
NGC 7640 is a barred spiral galaxy in the constellation of Andromeda.Discovered on October 17, 1786 by the English astronomer William Herschel. The galaxy has an 11th visible magnitude and is located about 30 million light-years from Earth.
Xi Andromedae (ξ Andromedae, abbreviated Xi And, ξ And), officially named Adhil / ə ˈ d ɪ l /, [7] [8] is a solitary [3] star in the northern constellation of Andromeda. It has an apparent magnitude of +4.9. [2] Based on parallax measurements obtained during the Gaia mission, it lies at a distance of roughly 223 light-years (68 parsecs ...