Star Clusters M13 Globular Cluster – QHY183c Image February 2, 2020 admin Leave a comment M13 on Feb 2, 2020. 100×30 sec, Gain 42, Offset 15, -20C, QHY183c, UHC-S filter, TV-85 at F/5.6. Last object of my imaging session for the night of Feb 1st/2nd, 2020 was the globular cluster, M13. Twilight was just starting when I stopped at 100 sub-images. Not too bad for a quickie.