M3 is one of the beautiful and brightest globular cluster in the sky. M3 is in the Canes Venatici constellation. This image show the different colors of many stars, from blue to orange.

Technical Data
Optics Newton 310mm Maccagnan
Focal Lenght 1560mm
Focal Ratio f/5
Exposure Time and filters LRGB 16:6:6:6 (single exposures of 2 min), total exposure 34m
Sensor Kaf-402me grade 2
Chip temperature -34°C
Location Tradate (VA, in Pianura Padana, Italy) at 300m
Date and time of exposure start 30 december 2005, 6.24 UT
Mount Gemini G41
Tracking ST4 with Pentax 75 at 1000mm
Temperature and humidity T=-10°C, RH=30%

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