This image of Messier 5 was imaged from Roberts Creek on June 28/29, 2016 with a Megrez 120mm, Canon 60Da, and a x1.6 Barlow lens. Guided exposures were taken at 10, 30, 60 and 120 seconds for a total exposure time of 30 mins. at 1600 ISO. Stacking was with Deep Sky Stacker, processing in Photoshop CS2 and PixInsight. The sky quality was good the moon had not risen, unfortunately I forgot to take an SQM reading.
Globular Cluster M5 is 24,500-light years away in the constellation Serpens. At about 13 billion, it is one of the most ancient globular clusters known, having formed only a few billion years after the Big Bang. M5 is one of the 160 globular clusters known to reside in a spherical halo around the Milky Way’s galactic center. M5 is one of the larger globular clusters, containing about 100,000 stars within a diameter of 165 light-years.
M5 is located in the constellation Serpens Caput, just north of Zubeneschamali. It is barely detectable to the unaided eye as a faint star but in binoculars, it appears as a faint, fuzzy star. The image here was taken through a 120mm Megrez refractor. Some amateur observers think that M5 is the finest globular cluster north of the celestial equator for small telescopes – even better than the celebrated M13, the Great Hercules cluster.