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Contains:  M 81, Bode's nebulae, NGC 3031

Image of the day 01/13/2019

Getting plate-solving status, please wait...
    M81 HaLRGB, 


            Kevin Morefield

    M81 HaLRGB

    Technical card

    Resolution: 3169x2577

    Dates:Jan. 6, 2019

    Astrodon Blue: 29x600" -30C bin 1x1
    Astrodon Green: 30x600" -30C bin 1x1
    Astrodon Ha 5 nm: 43x1200" -30C bin 1x1
    Astrodon Luminance: 48x600" -30C bin 1x1
    Astrodon Red: 35x600" -30C bin 1x1

    Integration: 38.0 hours

    Darks: ~20

    Flats: ~20

    Bias: ~20

    Avg. Moon age: 0.39 days

    Avg. Moon phase: 0.17%

    Bortle Dark-Sky Scale: 3.00 job: 2456937

    Locations: Sierra Remote Observatory, Auberry, California, United States

    Data source: Own remote observatory

    Remote source: Sierra Remote Observatories


    This is started out as one of the early images I was shooting with the Planewave and STX. I tried to fit M81 and M82 in the same frame with both in the corner. Bad idea....

    After starting over twice with a focus just on M81, due to registration problems, I found the only part of the of the original data I could use was the core. I almost always use a Super-luminance of all color and luminance subs and I did here as well. So that core includes data from at least 35 hours of subs. But the rest of the galaxy is a Super-luminance of the sharpest half of the Luminance, Red, Green, and Blue subs. Ha was used to enhance the nebulae - I added it in photoshop as a colorized layer in lighten mode.

    One goal I had when processing was to get detail out of the core while retaining the "domed" look that it has naturally. By that I mean the core is thicker than the spiral arms and I wanted to make sure it looked that way.

    Given the depth of the Super-Luminance data, I have a good base to add IFN data later. But for now I just want to have a COMPLETED M81!



    Kevin Morefield
    License: None (All rights reserved)


      M81 HaLRGB, 


            Kevin Morefield
    • Final
      M81 HaLRGB, 


            Kevin Morefield


    Core color


    M81 HaLRGB, 


            Kevin Morefield