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Contains:  M 81, Bode's nebulae, NGC 3031
Getting plate-solving status, please wait...
"Negative Redshift - M81", 





    
        

            carl0s
"Negative Redshift - M81"

"Negative Redshift - M81"

Technical card

Resolution: 2193x1701

Frames:
Baader Planetarium Blue 1.25": 149x120" bin 2x2
Baader Planetarium Green 1.25": 292x120" bin 2x2
Baader Planetarium H-Alpha 1.25" Highspeed: 156x300" bin 2x2
Hutech IDAS 2" LPS P2: 204x300" bin 1x1
Baader Planetarium Red 1.25": 66x120" bin 2x2

Integration: 46.9 hours

Astrometry.net job: 2003256

RA center: 148.933 degrees

DEC center: 69.054 degrees

Pixel scale: 1.169 arcsec/pixel

Orientation: 274.700 degrees

Field radius: 0.451 degrees

Description

That's my 2nd attempt on Bode's Galaxy. Messier 81 is a jewel of the northern sky. It's a big and bright target with lot of starbursting activity and nice spiral arms. The activity is easily detectable , even without a Ha filter. Still, an Ha filter reveals more of those regions. To my surprise, M81 has a negative redshift, so it seems to come towards us. It would be nice to see merging the Local Group with the M81 group in some tens of billions of years, but I'm not sure if the gravity is strong enough.

I tried to pay full respect to the color spectrum of this wonderful spiral.
Also, with 17h of Luminance, Arp's Loop became visible, even in my light polluted orange area. Broadband imaging is really hard here, but such galaxies are worth all the spent time.

Comments

Author

carl0s
carl0s
License: Attribution-NonCommercial-ShareAlike Creative Commons
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"Negative Redshift - M81", 





    
        

            carl0s