A few nights ago I was capturing luminance frames of M106 and NGC3718. After a session of a few hours and with M106 slightly past zenith, instead of doing a meridean flip, I decided to point the telescope to a well known object of the Spring sky. This object has been photographed probably more than the number of stars it contains but I still find M13 to be an interesting target to image.
Messier 13 (M13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of about 300,000 stars in the constellation of Hercules. With an apparent magnitude of 5.8, it is barely visible with the naked eye on a very clear night. Its diameter is about 23 arc minutes and it is readily viewable in small telescopes. M13 is about 145 light-years in diameter.
Telescope: Astrosib RC250 @ f/6 f=1500mm
Mount: Mesumount 2
Guiding: OAG with Lodestar
Exposure: 11x10min L + 3x10min R + 3x10min G + 3x10min B
Date: March 6th, 2014
Location: Overijse, Belgium