2020-04-23 / Click on image to enlarge


M3 or NGC 5272 is a globular cluster located in the constellation Canes Venatici, the Hunting Dogs. It is one of the brightest, largest globular clusters in the sky and is about 33,900 light years away from Earth.

The cluster has an estimated total mass of about 450,000 solar masses and contains approximately half a million stars.

Technical Details

LocationZollikerberg, Switzerland
CameraNikon DSLR D810A
TelescopeTS ONTC 12" f/4 Carbon Newton
OpticsTS 2,5" Wynne Coma Corrector
Focal Length1140mm
MountiOptron CEM60 Center-Balanced Equatorial Mount
AutoguidingPHD2 (Dithering)
Planetarium SoftwareStellarium
Image Session ControlAPT - Astro Photography Tool v3.81, ASCOM Platform 6
Lights50 x 120s (total 1h40'), ISO-1600, additional Biases, Flats, no Darks
Stacking SoftwarePixinsight 1.8, Drizzle 2x
Image ProcessingPixinsight 1.8