The Pinwheel Galaxy, also known as M101, is a stunning spiral galaxy located in the constellation Ursa Major, about 21 million light-years from Earth. With a large, nearly face-on orientation, it displays beautiful, well-defined spiral arms filled with bright blue star clusters and reddish regions of active star formation. M101 is known for its striking symmetrical structure and massive size, spanning about 170,000 light-years across, making it almost twice the diameter of our Milky Way.

My first attempt to capture this galaxy was 8 years ago. This time I am equipped with a new camera and significantly improved processing skills:

TelescopeNewtonian 254/1000 mm
Aperture254 mm
Focal length1170 mm
MountGemini G53f
AutoguidingZWO 174MM, TS 60/240 mm
CameraZWO 2600MC @-10°C
CorrectorTeleVue Paracorr 2″
FiltersAntlia RGB
Exposure153x180s, Gain 100, bin 1×1,
Date2024-04-11