M99 is a classic Sc spiral galaxy in the constellation Coma Berenices lying at a distance of 49 million light-years from Earth. It is called the Little Pinwheel Galaxy because of its resemblance to M33, the Pinwheel Galaxy, and M101, the Northern Pinwheel Galaxy. Exposures: L:R:G:B =130:60:60:55 minutes = 5 hours total exposure at f/8.3.