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The Sombrero Galaxy (also known as Messier Object 104, M104 [4] or NGC 4594) is a peculiar galaxy of unclear classification [5] in the constellation borders of Virgo and Corvus, being about 9.55 megaparsecs (31.1 million light-years) [2] from the Milky Way galaxy.
Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies can be classified according to their morphologies, the most famous being the Hubble sequence , devised by Edwin Hubble and later expanded by Gérard de ...
A spiral galaxy is a type of galaxy characterized by a ... The classification column refers to the galaxy morphological classification ... M104, Sombrero Galaxy: SA(s ...
The galaxy — also known as Messier 104, or M104 — is about 30 million light-years from Earth in the Virgo constellation. French astronomer and comet hunter Pierre Méchain discovered it in 1781.
When simply looking at a galaxy's image, lenticular galaxies with relatively face-on disks are difficult to distinguish from ellipticals of type E0–E3, making the classification of many such galaxies uncertain. When viewed edge-on, the disk becomes more apparent and prominent dust-lanes are sometimes visible in absorption at optical wavelengths.
Charles Messier. The first edition of 1774 covered 45 objects (M1 to M45).The total list published by Messier in 1781 contained 103 objects, but the list was expanded through successive additions by other astronomers, motivated by notes in Messier's and Méchain's texts indicating that at least one of them knew of the additional objects.
File:Sombrero Galaxy (also known as Messier Object 104, M104 or NGC 4594).jpg cropped 31 % horizontally and 50 % vertically using CropTool with lossless mode. File usage The following page uses this file:
Galaxy classification is classification by means of and for the discipline of astronomy. galaxy morphological classification; galaxy AGN classification ...