Messier 106 RGB

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Messier 106 also known as NGC 4258 is an intermediate spiral galaxy in the constellation Canes Venatici. It was discovered by Pierre Méchain in 1781. M106 is at a distance of about 22 to 25 million light-years away from Earth. It is also a Seyfert II galaxy and it is one of the largest and brightest nearby galaxies, similar in size and luminosity to the Andromeda Galaxy.
M106 is place of a galactic size MASER emission of water vapor at a frequency of 22GHz that evidences dense and warm molecular gas. [Wiki]

Optic SW Quattro 8S 200mm f/4 with Baader MPCC Mark III corrector
Camera Atik 383L+
Filters Baader L, R, G, B 36mm, IDAS LPS-P2
Mount NEQ6 with EQASCOM
SW 70/500 with AlCCD5
Frame center
RA 12:17:27 DEC 47:16:40 J2000
April and May 2017
Backyard, Busto G. Milan, Italy
Exposures L 24x900s bin 1x1 @-10°C
RGB 18x600s bin 2x2 each

Integration time - 18h

Some hint of Ha kindly provided by my friend Carl