M3 Globular Cluster


Mark Griffith

Swindon, Wiltshire. UK

Celestron C11 Sct, Skywatcher NEQ6 pro mount,Atik 383L+ camera, motorised filter wheel and Astronomik filters.

Bright globular cluster in canes venatici. Dense core of 250,000 stars in 11 light years.

Slew to the bright star Arcturus to check focus before starting the image run. Used a barhinov mask to obtain perfect focus.

LRGB image with 3 hours and 40 minutes of data. 49 x Lum 13 x Red 13 x Green 13 x Blue 2.5 minute exposures.