Messier 13 (M13), also known as the Great Globular Cluster in Hercules, is a globular cluster located in Hercules constellation. Messier 13 is one of the brightest and best known globular clusters in the northern sky. The cluster has an apparent magnitude of 5.8 and lies at a distance of 22,200 light years from Earth. This cluster has an estimated age of 11.65 billion years and contains about 300,000 stars.
There are probably more pictures of M13 than the number of stars it contains. However I picked this object to test the resolution capabilities/resolving power of my telescope. The relative short total exposure time of around 4 hours was gathered under good seeing conditions (1.1″ – 1.4″). Please check the full resolution version to appreciate it to its fullest 🙂
Cropped detail of Messier 13
Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 4 hours (32x300s L + 3x6x300s RGB)
Date: April 2018
Location: Southern Alps, France
Full FOV of M13 and surroundings
PGC annotated version
Bart Delsaert - Astrophotography 