Right Ascension = 16:41:0.7 (h:m:s), Declination = +36 28 (deg:m:s)
Magnitude =5.8, Size = 16.6 arc minutes
This image is made up of 1 20second exposure @ -20C degree. Autodark subtract a sharpen and DDP'd. There is no guiding. This is a f1.95 fastar image.
M13, also called the `Great globular cluster in Hercules', is one of the most prominent and best known globulars of the Northern celestial hemisphere. At its distance of 22,200 light years, its angular diameter of 23' corresponds to 150 light years. It contains over 100,000 stars.