Located in the direction of Serpens close to the star, 5 Ser, in the sky it is 24,500 ly distant and approximately 160 ly across. Mass is about 8.6x105 solar masses. It contains over 100 variable stars, mainly RR Lyrae stars - important standard candles for determining distance - and two milli-second pulsars (ie, neutron stars, one of which is in a binary) which has been studied to gain insights into the nature of neutron degenerate matter. The cluster has also been used to study other aspects of astrophysical interest.
Classified, V (intermediate 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 = 10:10:10 ≡ 30m||Location:||ASV's LMDSS, Lady's Pass, Victoria, Australia|
|Date:||August 2023||Processing:||CCDStack2, RegiStar and Photoshop CS5|