M 108

About image

M108 is a spiral galaxy in Ursa Major constellation; its apparent dimension is 8.3’ x 2.5’ and is 45 million of light years away. 

Its arms are strongly obscured by large complexes of dark nebulae and interstellar dust, which make the galactic core invisible. 

Even if it was observed by the famous astronomer Charles Messier, it was never inserted inside its Catalogue because at that time it was already published, so curiously it was inserted inside the Catalogue only in 1953.
This image was taken under a very polluted sky due to many lamp streets surrounding my home terrace. I did anyway a very long exposure and I was able to catch the lights of 34 very faint galaxies, as you can see in the annotated image on the right side.

Technical data
Optic         Tecnosky Apo refractor LT 130-910mm f/7
Mount       Skywatcher EQ8
Camera                      Atik 4000 with Starlight Xpress external filter wheel 5 positions
Filters                         Baader 50mm unmounted LRGB 
Guiding system         Artesky Ultraguide 70mm 
Exposure details    L 36x300" bin1 -15C

         R 38x300" bin1 -15C

         G 42x300" bin1 -15C
            B 39x300" bin1 -15C
Total integration       12.9h
Acquisition                Voyager, PHD2
Processing                Pixinsight 1.8, Photoshop CS5
SQM-L                       18.4    
Location                    Rescaldina (Italy), home terrace
Date                           19 March, 10/11/15 April 2020

© Roberto Marinoni 2019 - All rights reserved