Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
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

    Frames:
    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

    Astrometry.net job: 2456937

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

    Data source: Own remote observatory

    Remote source: Sierra Remote Observatories

    Description

    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!

    Comments

    Author

    morefield
    Kevin Morefield
    License: None (All rights reserved)
    157724
    Like

    Revisions

      M81 HaLRGB, 





    
        

            Kevin Morefield
      Original
    • Final
      M81 HaLRGB, 





    
        

            Kevin Morefield
      B

    B

    Core color

    Histogram

    M81 HaLRGB, 





    
        

            Kevin Morefield