M3 in Canes Venatici
Distance:33,000 ly / Apparent size: 18' / Brightness:6.4mag / Class: Gb / Stars:500,000 / 212 variable stars / many young stars / Luminosity: 300,000 Suns / Mass: 245,000 Suns / Diameter:220ly / Core diameter, 11 ly / Gravitational diameter: 760 ly / Spectral type: F6 / B-V index=0,69
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Exposures: f=528, f/4.2, LRGB=2x300s each channel at -25°C
