About image

M74 is a spiral galaxy in Pisces constellation, with apparent magnitude 9.4.
Its distance fom Milky Way is 30 million light years, so considering its apparent dimensions of 10.5’x9.5’ its real extension is 92000 light years.
Due to its face-on view it is possible follow the spiral arms from the centre to the dim outer regions.
Several HII regions are visible in the arms: the largest one has a diameter of 600 light years.
(info from Wikipedia/Cambridge Photographic Atlas of Galaxies)

Technical data
Optic           GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount         10Micron GM2000 HPSII
Camera          Moravian G3-16200 with external filter wheel 7 positions
Filters       Astrodon Gen2 E-Serie Tru-Balance 50mm unmounted LRGB 
Guiding system     OAG Moravian M68 with guide camera Moravian G1-0301
Exposure details   L 10x600" bin2 -20C + 19x600" bin2 -25C
            R 10x600" bin2 -20C + 5x600" bin2 -25C
                          G 10x600" bin2 -20C + 4x600" bin2 -25C
            B 10x600" bin2 -20C + 4x600" bin2 -25C               
Total integration   12h
Acquisition       Voyager, PHD2
Processing       Pixinsight 1.8, Photoshop CS5, StarXTerminator, Topaz DenoiseAI
SQM-L        21.27    
Location        Promiod (Aosta Valley, Italy), own remote observatory
Date            11 August,  10/14 October, 5 November 2021

© Roberto Marinoni 2019 - All rights reserved