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Contains:  M 81, Bode's nebulae, NGC 3031
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M81 - Bode's Galaxy in HaRGB, 





    
        

            David Schlaudt
M81 - Bode's Galaxy in HaRGB

M81 - Bode's Galaxy in HaRGB

Technical card

Resolution: 8725x5817

Dates:March 8, 2019

Frames:
ZWO B 1.25" optimized for ASI1600: 60x180" (gain: 139.00) -20C bin 1x1
ZWO G 1.25" optimized for ASI1600: 60x180" (gain: 139.00) -20C bin 1x1
ZWO Hɑ 7nm 1.25": 45x180" (gain: 300.00) -20C bin 1x1
ZWO R 1.25" optimized for ASI1600: 60x180" (gain: 139.00) -20C bin 1x1

Integration: 11.2 hours

Darks: ~10

Flats: ~20

Avg. Moon age: 1.67 days

Avg. Moon phase: 3.11%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 2584076

RA center: 148.891 degrees

DEC center: 69.061 degrees

Pixel scale: 0.345 arcsec/pixel

Orientation: 77.087 degrees

Field radius: 0.502 degrees

Locations: Home, Rockford, Michigan, United States

Data source: Backyard

Description

M81 is a beautiful spiral galaxy approximately 12 million light years away, making it one of the closest large galaxies outside our local group. I was surprised to learn that M81 is actually blue shifted meaning it is moving towards us. M81 has stunning spiral arms which contain star forming regions which I've tried to pull out of this image with the help of my 7nm Ha filter. Barely visible below M81 is a dwarf satellite galaxy named Holmberg IX which I have actually never noticed in previous observations until this most recent imaging session.

Comments

Author

Schlaudt10
David Schlaudt
License: Attribution Creative Commons
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M81 - Bode's Galaxy in HaRGB, 





    
        

            David Schlaudt