Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's nebulae  ·  M 81  ·  NGC 3031
"Negative Redshift - M81", 



    
        

            carl0s
"Negative Redshift - M81"
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"Negative Redshift - M81"

Technical card

Imaging telescopes or lenses: Lacerta Newton ohne Namen 200/800

Imaging cameras: Atik 460 EX Mono

Mounts: 10 Micron GM 1000 HPS

Focal reducers: Lacerta GPU

Software: PixInsight  ·  The GIMP Team The GIMP  ·  CCDciel  ·  Darktable

Filters: Baader Planetarium H-Alpha 1.25" Highspeed  ·  Baader Planetarium Red 1.25"  ·  Baader Planetarium Blue 1.25"  ·  Baader Planetarium Green 1.25"  ·  Hutech IDAS 2" LPS P2


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


Basic astrometry details

Astrometry.net job: 1990326

RA center: 9h 55' 42"

DEC center: +69° 3' 14"

Pixel scale: 1.173 arcsec/pixel

Orientation: 274.329 degrees

Field radius: 0.569 degrees


Resolution: 1824x1492

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

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Sky plot

Sky plot

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"Negative Redshift - M81", 



    
        

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