Located in the direction of Ophiuchus, it is around 16,400 ly distant, diameter of 75 ly and has a mass of about 8.7x104 solar masses. In keeping with many other globular clusters, it is one of the oldest known structures associated with the Milky Way galaxy with an age estimated at around 13 Gyr.

Classified, IX (loose towards the centre), on the Shapley-Sawyer globular cluster concentration scale (1927), it is rather loosely-packed for a globular cluster and was once considered to be a tightly concentrated open cluster. 


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: August 2023 Processing: CCDStack2, RegiStar and Photoshop CS5