A fine object located in the direction of Aquarius, it is at the limit of naked eye visibility from very dark skies. Despite its considerable distance of 55,000 ly, it is impressive even in small telescopes as it is one of the largest globular clusters known, at approximately 175 ly in diameter. Containing around 150,000 stars and having a mass of about 1.04x105 solar masses, it is one of the oldest known globular clusters associated with the Milky Way - 12.5 billion years old. Classified, II (dense central concentrations), on the Shapley-Sawyer globular cluster concentration scale (1927). 


Camera: SBIG STL11000M, Astrodon filters Scope: Takahashi TOA-130, f=1000mm, f7.7, fov 1.0 x 0.7
Mount: Takahashi EM-200 Temma 2 Guiding: external (E-finder)
Filters/Exposures: R:G:B = 12:12:1236m Location: ASV's LMDSS, Lady's Pass, Victoria, Australia
Date: September 2023 Processing: CCDStack2, RegiStar and Photoshop CS5