Globular Cluster M3
M3 ( also desiganted as NGC 5272) is a globular cluster in the constellation Canes Venatici. It was discovered by Charles Messier in 1764, and resolved into stars by William Herschel around 1784. This cluster is one of the largest and brightest, and is made up of around 500,000 stars. It is located at a distance of about 33,900 light-years away from Earth.
Photo Details
Telescope: Orion CT8 Newton(900mm)
Camera: Sbig STL11000, Filter wheel, Baader 2" LRGB filters
Mount: Mach1
Guiding: Self-guided
Exposure: LRGB L 18x3min, RGB 6x3min
When: April 2017
Other information: good transparency, good seeing, taken in the city of Tarnów 
Photo Details
Telescope: Celestron C8N (1000mm)
Camera: Sbig ST-2000XM, Filter wheel, Baader 1.25" LRGB filtes
Mount: NJP Takahashi
Guiding: Self-guided
Exposure: LRGB L 14x8min, 12x3min, 20x1min RGB 5x5min
When: Spring 2010 and 2014
Other information: good transparency, very good seeing