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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
NGC 7662 is a planetary nebula located in the northern constellation Andromeda.It is known as the Blue Snowball Nebula, Snowball Nebula, and Caldwell 22.This nebula was discovered October 6, 1784 by the German-born English astronomer William Herschel.
The star was discovered to be variable in 1927, with a photographic magnitude range of 15.3 to 16.5, at the Harvard College Observatory and designated HV 4013. It was considered to be the brightest variable star in M31.
Zooming In on the Andromeda Galaxy, also known as Gigapixels of Andromeda, is a 2015 composite photograph of the Andromeda Galaxy produced by the Hubble Space Telescope. It is 1.5 billion pixels in size, and is the largest image ever taken by the telescope. [1] At the time of its release to the public, the image was one of the largest ever ...
1912 – Vesto Slipher's spectrographic studies of spiral nebulae find high Doppler shifts indicating recessional velocity. 1917 – Heber Curtis finds novae in Andromeda Nebula M31 were ten magnitudes fainter than normal, giving a distance estimate of 150,000 parsecs supporting the "island universes" or independent galaxies hypothesis for spiral nebulae.
SN 1885A (also S Andromedae) was a supernova in the Andromeda Galaxy, the only one seen in that galaxy so far by astronomers. It was the first supernova ever seen outside the Milky Way, [3] though it was not appreciated at the time due to how far away it was. It is also known as "Supernova 1885".
Isaac Roberts' magnum opus is generally considered to be his picture of the Great Nebula in Andromeda, shown in this plate. It was photographed on 29 December 1888. Astrophotography requires very long exposure times (sometimes an hour or more) to record faint objects on a photographic plate.
At the center is the Andromeda Galaxy. Nu Andromedae is spectroscopic binary [ 3 ] system with a nearly circular orbit that has a period of 4.2828 days. [ 5 ] The primary component is a B-type main sequence star with a stellar classification of B5 V. [ 3 ] The fainter secondary has a classification of F8 V, [ 5 ] which makes it an F-type main ...