Located in the direction of Ophiuchus, it is roughly 21,500 ly distant and about 100 ly across. Having a mass of about 1.2x106 solar masses, it is among the ten most massive and luminous globular clusters in our galaxy. Relatively metal-poor (ie contains few elements heavier than helium), its metals abundance is suggestive of two phases of star formation. Classified, IV (intermediate rich 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: internal
Filters/Exposures: R:G:B = 10:10:1030m Location: ASV's LMDSS, Lady's Pass, Victoria, Australia
Date: July 2023 Processing: CCDStack2, RegiStar and Photoshop CS5