Triangulum Nebula - Messier 33 05-Dec-2015
Top of Mississippi Skies (T.O.M.S.) Observatory (lat 35°N - lon 88°W) TMB-130SS Apo @ f/7; AP1200 Mount; AutoGuiding with Lodestar via PHD2; SBIG ST-8300C OSC camera; Astronomik CLS Filter; RigelSys nSTEP autofocusing with image capture via ImagesPlus (IP) v6.0 Camera Control; approximately 1.8 hrs of data processed with Dark, Flat and Bias Frames; Light frames were calibrated, stacked and processed with IP v6.5.
Excerpt from Wikipedia:
The Triangulum Galaxy is a spiral galaxy approximately 3 million light-years (ly) 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, the Andromeda Galaxy and about 44 other smaller galaxies. It is one of the most distant permanent objects that can be viewed with the naked eye.
The galaxy is the smallest spiral galaxy in the Local Group and it is believed to be a satellite of the Andromeda Galaxy due to their interactions, velocities and proximity to one another in the night sky. It also has an H-II nucleus.