M13 - Hercules Globular Cluster Revisited

Well I finally redid this object after three years.  The old image was so 'good' I must have forgot to put it on Astrobin as a separate image but here is a link to it (https://kurtzeppetello.smugmug.com/Globular-Clusters/i-w5KSQBj).  Like all globular clusters, M13 or the Hercules Globular Cluster (NGC 6205), does not reside in the galactic plane but rather outside surrounding the central bulge.  M13 is considered to be the best in the northern hemisphere and is visible all year at latitudes greater than 36 degrees.  With a diameter of 145 light-years and several hundred thousand stars it certainly does have boasting rights.  Even at 22,000 light years away it it very impressive.  The cluster, like most clusters, contains very old stars on the order of 12 to 13 billion years old, however, this cluster is of particular interest because it produces young blue stragglers - large blue giant stars formed as result of colliding old stars (source: wikipedia and Earthsky).

M13 - Hercules Globular Cluster
Location: Happy Frog Observatory, Monroe, CT
Date: 06-15-18
Camera: Canon EOS Rebel T3i(a), AstroPhotography Tool APT
Telescope: Orion ED80 80mm f/7.5 Apochromatic Refractor Telescope
Barlow: None
Focal Length: 600mm
f/7.5
Focal Reducer: Orion 0.8x Focal Reducer for Refractor Telescopes
Mount: Orion Sirius EQ (HEQ5)
Filter: Astrodon UV/IR
Autoguiding: QHY-5L-II-M attached to an Agena 50mm Guide Scope with Helical Focuser
Exposure: 58 x 90s
ISO: 1600
Temp: 18 C
Post Processing: Deep Sky Stacker, Photoshop, Gradient Exterminator, Astronomy Tools, StarTools, Lightroom2
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