M 61

About image 

Messier 61 belongs to the Virgo Cluster and lies at a distance of 50 million light years.
Its angular size of 6.5’x8.5’ corresponds to a maximum disc diameter of 95000 light years.
The galaxy shows itself with an inclination of 25°, allowing to view the spiral pattern: this is dominated by two arms which join onto a bar structure in the inner region.
Several HII regions are visible on the arms.
[Text adapted from “The Cambridge Photographic Atlas of Galaxies”]
Two others bright galaxies are visible in the image: NGC 4301 (in the top right side) and NGC 4292 (in the bottom right side).
Several other remote galaxies are visibile in the background.

Technical data
Optic         GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount       10Micron GM2000 HPSII
Camera        ZWO ASI 2600 MM Pro with filter wheel 7 positions
Filters        Astrodon Gen2 E-Serie Tru-Balance 50mm unmounted LRGB  
Guiding system   ZWO OAG-L with guide camera ASI 174MM
Exposure details  L 47x300" bin3 -15C

             R 16x300" bin3 -15C
             G 16x300" bin3 -15C
          B 16x300" bin3 -15C

                all gain 100
Total integration  7h55'
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5, StarXTerminator, NoiseXTerminator, BlurXTerminator
SQM-L       21.18   
Location       Promiod (Aosta Valley, Italy), own remote observatory
Date           19 April 2023, 18 February / 11 April 2024


© Roberto Marinoni 2019 - All rights reserved