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Contains:  Bode's Galaxy, M 81, NGC 3031
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M81, Bode's Galaxy, 


            Ruben Barbosa
M81, Bode's Galaxy
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M81, Bode's Galaxy

Technical card

Imaging telescopes or lenses:The Liverpool Telescope

Imaging cameras:IO:O

Software:Maxim DL, Gimp

Bessell-B: 8x120"
Bessell-V: 8x120"
H-Alpha: 8x300"
Sloan r': 8x240"

Integration: 1.7 hours job: 3555025

RA center: 9h 55' 35"

DEC center: +69° 3' 54"

Pixel scale: 0.303 arcsec/pixel

Orientation: 90.024 degrees

Field radius: 0.108 degrees

Resolution: 1886x1742

Data source: Professional, scientific grade data


* Image acquisition by Liverpool Telescope.
* Processing: Ruben Barbosa.
* Distance: 12 Mly.

The Bode's Galaxy (also known as NGC 3031 or Messier 81) was named after its discoverer and is a magnificent spiral located about 12 million light-years away in the direction of the constellation Ursa Major. It has a size similar to that of the Milky Way and is one of the easiest to observe due to its apparent magnitude of 6,8.

The M81 is the largest in its group, consisting of 34 galaxies, only about 150,000 light years from its neighbor M82, forming a beautiful pair that attracts astrophotographs.
It is estimated that a few million years ago, the two galaxies interacted gravitationally in a pronounced way, either by collision or approximation, to the point that the Bode galaxy had deformed significantly M82, although it still maintains pronounced features in the spiral pattern that It characterizes it.

The image reveals the bright yellow nucleus, blue spiral arms with pink zones where star formation occurs and traces of dust in the disc that could have been originated by the encounter with the M82.

The orbital velocity of the peripheral stars is smaller than that of the near ones of the nucleus, which contrasts with that observed in most of the galaxies, indicating that the M81 will have little dark matter.



Ruben Barbosa
License: None (All rights reserved)

Sky plot

Sky plot


M81, Bode's Galaxy, 


            Ruben Barbosa