Whirlpool Galaxy, M51

2020-04-11/14/15 / Click on image to enlarge


The Whirlpool Galaxy, M51, is a grand design spiral galaxy located in the constellation of Canes Venatici. It is one of the most famous galaxies in the sky, appearing face-on when viewed from Earth. M51 has a much smaller dwarf companion, known as NGC 5195, and together they form the finest and most studied example of an interacting galaxy pair in the sky. The M51 lies in a distance of 23 million light years from the Earth and has a diameter of 75'000 light years.

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
Lights32/16/35 x 120s (total 2h46'), ISO-1600, additional Biases, Flats, no Darks
Stacking SoftwarePixinsight 1.8, Drizzle 2x
Image ProcessingPixinsight 1.8