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M 3

Messier 3 (M3 or NGC 5272) is a globular cluster of stars in the northern constellation of Canes Venatici. It contains 274 known variable stars; by far the highest number found in any globular cluster. The overall abundance of elements other than hydrogen and helium, what astronomers term the metallicity, is in the range of –1.34 to –1.50 dex. This value gives the logarithm of the abundance relative to the Sun; the actual proportion is 3.2–4.6% of the solar abundance.

Imaging telescope: TS Photon 8" F5 Newtonian reflector
Imaging camera: Nikon D3500
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: -

Software: Adobe Photoshop 2020, DeepSkyStacker, PHD Guiding
Frames:
20 x 240s ISO 200
20 x 120s ISO 400
Integration: 2 hours
Date captured: 02/08/2020
Location: Athens, Greece
Bortle Scale (?): 8