Target Details
The Pinwheel Galay, Messier 101, is a face-on spiral galaxy distanced 21 million light-years away in the constellation Ursa Major. 

M101 is a large galaxy comparable in size to the Milky Way. With a diameter of 170,000 light-years it is roughly equal the size of the Milky Way. It has a disk mass on the order of 100 billion solar masses, along with a small central bulge of about 3 billion solar masses. 

M101 is noted for its high population of H II regions, many of which are very large and bright.

Capture Details
Data captured 5th March, 2016.
21x 4 minute exposures at ISO400.

Equipment Details
Orion Europa 200
NEQ6 Pro
Nikon d7100
Skywatcher ST-80
QHY5L-II

Processing Details
This image was processed in Pixinsight & Lightroom.