M13 discovered by Edmond Halley in 1714 and then added to Charles Messier’s catalog on June 1, 1764, is a bright globular cluster in the constellation Hercules. This globular cluster is one of the largest visible in the northern hemisphere and on a clear dark night without a moon to interfere it is visible to the unaided eye. M13 is 25,100 light years away with an angular diameter of 20′, or 145 light years. The cluster contains hundreds of thousands of stars, and towards it’s dense core the stars are more about 500 times more concentrated than in the solar neighborhood. The age of the cluster is estimated to be around 14 billion years which was the revised estimate in 1962. There is a peculiar young blue star located within M13 named, Barnard No. 29.
I imaged and viewed this while there was an nearly full moon present and through the telescope it still stood out visually, although it seemed to wash out everything but the core for visual observing, and made resolving individual stars more difficult. Despite having a nearly full moon I was still able to get some pretty good images showing off this large northern hemisphere globular cluster.
This image is 45 images at 1 minute a piece at ISO 800 with 34 dark frames. Stacked in Deep Sky Stacker, and post processing done in Photoshop.
I get all my Messier list Deep Sky object information from The Messier Catalog.
Omni XLT 150 with CG-4 mount
Modded Canon 350D
T-ring and adapter
Polar Scope for alignment