Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  M 81  ·  NGC 3031
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M81, 



    
        

            tommy_nawratil
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M81

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



    
        

            tommy_nawratil
Powered byPixInsight

M81

Imaging Telescopes Or Lenses
Lacerta Photonewton
Imaging Cameras
ZWO ASI1600MM-Cool
Mounts
Skywatcher AZ-EQ6
Filters
Astronomik LRGB 31mm
Accessories
Skywatcher/Lacerta GPU comacorrector
Software
Photoshop · Pleiades Astrophoto, S.L. Pix Insight · APT - Astro Photography Tool APT 3.13
Guiding Telescopes Or Lenses
Skywatcher 9x50 finder
Guiding Cameras
Lacerta Mgen3

Acquisition details

Dates:
March 16, 2020
Frames:
255x180" (12h 45')
Integration:
12h 45'
Avg. Moon age:
22.23 days
Avg. Moon phase:
49.12%

RA center: 09h55m33s.82

DEC center: +69°0405.2

Pixel scale: 1.177 arcsec/pixel

Orientation: -1.160 degrees

Field radius: 0.285 degrees

More info:Open 

Resolution: 1391x1051

Locations: my little astrofarm, Weppersdorf, Austria

Data source: Backyard

Description

M81, also called Bode's galaxy, is one of the biggest and brightest galaxies in the sky.

At 12 Million lightyears distance, many details can be resolved if scope and seeing permits.

Here the seeing was good, and the scope was first time guided by the new Lacerta Mgen3 guider using multistar guiding. That additionally helps keeping stars compact by virtually eliminating seeing effects on the guidescope. I was really amazed to see the raw pics come in that sharp.

At left there is the small satellite galaxy Holmberg IX resolved into stars, and a HII region there is also visible.

Throughout the field there is a lot galactic cirrus nebula or IFN visible, belonging to our Milkyway galaxy.

Presented are a crop on M81 and Holmberg IX, a full field and an annotated version.

And a center crop of a single Lumi raw to show how that was like.

PI subframe selector analysis FWHM 2.29 pixelpitch = 0.78

LRGB using 10" f/4 Lacerta Photonewton and ASI1600mono with Astronomik filters.

The color here at Astrobin has a deeper orange hue than on my calibrated monitor. No idea why, have to ask Salvatore. A more original (yellower) color rendition can be found here on Flickr:

https://www.flickr.com/photos/[email protected]/49721368298

Interestingly, on my Android colors are fine!

EDIT: Its a confirmed Firefox problem, because Astrobin currently strips the embedded ICC profile from the uploaded image. You need to set color mode = 1 in FF. Other browsers do better by default.

Comments

Revisions

    M81, 



    
        

            tommy_nawratil
    Original
    M81, 



    
        

            tommy_nawratil
    B
    M81, 



    
        

            tommy_nawratil
    C
    M81, 



    
        

            tommy_nawratil
    D
  • Final
    M81, 



    
        

            tommy_nawratil
    E

B

Description: full field

Uploaded: ...

C

Description: annotated image

Uploaded: ...

D

Description: Lumi raw pic 100%, with psf, FWHM 2.29

Uploaded: ...

E

Description: M81 new upload with correct colors... not yet...

Uploaded: ...

Sky plot

Sky plot

Histogram

M81, 



    
        

            tommy_nawratil