Ed Bianchina's Astronomy



Triangulum Galaxy from a dark site

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Triangulum Galaxy from a dark site
The Triangulum Galaxy (also known as Messier 33 or NGC 598) is a spiral galaxy approximately 3 million light-years away in the constellation Triangulum. The galaxy is also sometimes informally referred to as the Pinwheel Galaxy by some amateur astronomy references[6] and in some public outreach websites.[7] However, the SIMBAD Astronomical Database, a professional astronomy database that contains formal designations for astronomical objects, indicates that the name "Pinwheel Galaxy" is used to refer to Messier 101,[8] and several other amateur astronomy resources and other public outreach websites also identify Messier 101 by that name.[9][10] With a diameter of about 50,000 light-years, it is the third largest galaxy in the Local Group, a group of galaxies that also contains the Milky Way Galaxy and the Andromeda Galaxy, and it may be a gravitationally bound companion of the Andromeda Galaxy. The Pisces Dwarf (LGS 3), one of the small Local Group member galaxies, is possibly a satellite of Triangulum.
Posted on September 20, 2009 Full Size| Slideshow