Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  Cigar Galaxy  ·  M 81  ·  M 82  ·  NGC 2976  ·  NGC 3031  ·  NGC 3034  ·  NGC 3077
Widefield of M81, M82 and surrounding galaxies, Andrea Alessandrelli
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Widefield of M81, M82 and surrounding galaxies

Widefield of M81, M82 and surrounding galaxies, Andrea Alessandrelli
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Widefield of M81, M82 and surrounding galaxies

Equipment

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Acquisition details

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Description

The first light for the Mesu 200 MkII mount. Good part of the data was collected with the Moon up and I tried to fix this by integrating a bit more than planned. Fortunately enough during the 5 and 6 of March I had time to shoot before the Moon rising.

Guiding also wasn't perfect the first two nights because I made mistakes calibrating the mount, this was fixed also the 5 and 6 of March.

The processing was quite hard: with my great surprise, after stacking the luminance frames, I discovered that the background was showing the Cirrus (IFN) faint signal (see revision B)

The signal was too faint to pull it out properly, so I opted to hide it as best as I could. (By the way to me it's still visible as tiny variations in the background brightness but I guess it's because I am also the one who processed the picture )

The Ha areas of NGC 2976 galaxy is what I like the most of this pictures, I set an undefinite appointment with that Galaxy at a higher focal lenght.

Comments

Revisions

  • Final
    Widefield of M81, M82 and surrounding galaxies, Andrea Alessandrelli
    Original
  • Widefield of M81, M82 and surrounding galaxies, Andrea Alessandrelli
    B

B

Description: The Cirrus signal in the background of the highly stretched luminance.

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Sky plot

Sky plot

Histogram

Widefield of M81, M82 and surrounding galaxies, Andrea Alessandrelli