Messier 3 (also known as M3 or NGC 5272) is a globular cluster of stars in the northern constellation of Canes Venatici. It was discovered by Charles Messier on May 3, 1764, and resolved into stars by William Herschel around 1784. Since then, it has become one of the best-studied globular clusters.
Luminace: 5 x 60sec (bin 1x1)
Red: 3 x 30sec (bin 2x2)
Green: 3 x 30sec (bin 2x2)
Blue: 3 x 30sec (bin 2x2)
ASA N12 Astrograph F/3.6
3" Wynne Reducer Corrector 0.73x
Atik 490 EX camera @-20C
Valla Observatory (FROSON, Sweden)
April 11, 2015
Images calibrated and processed in AstroPix
Calibration by applying Flat-Field
Registration with the AstroPix registration tool.
Color image with the AstroPix LRGB tool.
Only luminace channel used
Scale: 0.92 arcsec/pix
FOW: 52x42 arcmin