M101 - Pinwheel Galaxy

The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy 21 million light-years (6.4 megaparsecs) away from Earth in the constellation Ursa Major. It was discovered by Pierre Méchain in 1781 and was communicated that year to Charles Messier, who verified its position for inclusion in the Messier Catalogue as one of its final entries.

On August 24, 2011, a Type Ia supernova, SN 2011fe, was discovered in M101.

 

Telescope : T120 (www.obs-hp.fr/guide/t120.shtml)

Camera : Andor iKon-L 936 (www.obs-hp.fr/guide/camera-120/camera-120.shtml)

Filters : UBVRI Filter Set (www.obs-hp.fr/guide/camera-120/ubvri.shtml)

 

Acquisition :

Lights : RGB, total ~15min

Darks : no darks

Flats : 25 flats for each color

Bias : 25

 

Software :

Pre-processing : DeepSkyStacker

Processing : Siril, Pixinsight

Post-processing : Lightroom, Photoshop

Done