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M 13

Messier 13 or M13, also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of several hundred thousand stars in the constellation of Hercules. About 145 light-years in diameter, M13 is composed of several hundred thousand stars, the brightest of which is a red giant, the variable star V11, with an apparent visual magnitude of 11.95. M13 is 22,200–25,000 light-years away from Earth.

Imaging telescope: TS Photon 8" F5 Newtonian reflector
Imaging camera: ZWO ASI 533MC-P
Mount: Skywatcher HEQ-5 Pro Go-To
Guiding telescope: TS 80/600 F7.5 Achromat
Guiding camera: ZWO ASI 120MC-S
Coma corrector: TS GPU Superflat
Extras: ZWO EAF 5V Motor Focuser

Software: Adobe Photoshop 2020, DeepSkyStacker, PHD Guiding, PixInsight
Frames: 150 x 120s GAIN 100 @ 0 degrees
Integration: 5 hours
Date captured: 26/09/2021
Location: Athens, Greece
Bortle Scale (?): 8