The Triangulum Galaxy is a slanted face-on spiral galaxy approximately 2.8 million light years from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC 598, and is sometimes informally referred to as the Pinwheel Galaxy, a nickname it shares with Messier 101. The Triangulum Galaxy is the third-largest member of the Local Group of galaxies, which includes the Milky Way Galaxy, the Andromeda Galaxy (M31) and about 30 other smaller galaxies. It is one of the most distant permanent objects that can be viewed with the naked eye. Its diameter is about 50,000 light years, so less than half the size of the Milky Way or about a third as wide as M31.
M33 contains many reddish HII regions of star formation. The brightest sources lie within the central region of the galaxy and along the spiral arms.The four brightest HII regions are designated NGC 588, NGC 592, NGC 595 and NGC 604. The brightest of these regions, NGC 604, may have undergone a discrete outburst of star formation about three million years ago.
Orion Optics UK AG16 Astrograph: SBIG 11000 CM: Titan Mount
56 x 4 minutes minutes (3hr 44 minutes total) single shot colour, processed with CCDStack, Photoshop, Pixinsight.
Data capture: 29th October 2013