M101 - Pinwheel galaxy

mouse over for annotated version - click for full resolution

M101 or NGC5457 is a face-on spiral galaxy distanced 21 million light-years away in the constellation Ursa Major, first discovered by Pierre Méchain on March 27, 1781, and communicated to Charles Messier who verified its position for inclusion in the Messier Catalogue as one of its final entries.
It is an Sc type galaxy with several H II regions, that in deep pictures count up to 3000; these regions, in which stars form, are ionized by large numbers of extremely bright and hot young stars.
M101 shows an asymmetrical structure due to the tidal forces from interactions with its companion galaxies. [Wiki]

In this annotated version, apart from the most known NGC objects, there are 74 galaxies in this small field of less than 3 squared degrees....

Optic SW ED80 + 0,85 Reducer/Flattener
Camera Atik 383L+
Filters Baader L, R, G, B 36mm
Mount NEQ6
SW 70/500 with AlCCD5
Frame center
RA 14:03:55 DEC 54:26:36 J2000
20th April 2015
Pian dell Armà, Italian Alps
Exposures L - 18x600s Bin 1x1 @-10°C
R - 9x300s Bin 2x2
G - 9x300s Bin 2x2
B - 9x300s Bin 2x2

Integration time - 5h 15m

First light of the setup and first LRGB processing.