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Contains:  M 82, NGC 3034, M 81, Bode's nebulae, NGC 3031
Getting plate-solving status, please wait...
M81 and M82 again, 





    
        

            SJK
M81 and M82 again

M81 and M82 again

Technical card

Resolution: 2373x1639

Dates:Dec. 12, 2017

Frames:IDAS LPS D1: 114x120" -10C bin 1x1

Integration: 3.8 hours

Flats: ~30

Bias: ~380

Avg. Moon age: 24.26 days

Avg. Moon phase: 28.29%

Bortle Dark-Sky Scale: 7.00

Mean SQM: 18.86

Mean FWHM: 3.50

Temperature: -1.00

Astrometry.net job: 1866592

RA center: 148.951 degrees

DEC center: 69.362 degrees

Pixel scale: 1.554 arcsec/pixel

Orientation: 250.316 degrees

Field radius: 0.622 degrees

Locations: Home, Genève, Switzerland

Data source: Backyard

Comments

Author

SJK
SJK
License: Attribution Creative Commons
3244
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Revisions

  • M81 and M82 again, 





    
        

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    Original
  • M81 and M82 again, 





    
        

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    B
  • M81 and M82 again, 





    
        

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    C
  • M81 and M82 again, 





    
        

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    D
  • M81 and M82 again, 





    
        

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    E
  • M81 and M82 again, 





    
        

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    F
  • M81 and M82 again, 





    
        

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    G
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    H
  • M81 and M82 again, 





    
        

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    I
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    J
  • Final
    M81 and M82 again, 





    
        

            SJK
    K

D

Experimenting techniques found in a tutorial by Raul Lopez (cloudy nights every day).

E

A little (big) kick...

F

With more deconvolution combining madratter and raul lopez procedures

G

Controlled Deconvolution, Controlled stretch, Controlled saturation, Three local HIstogram Equalizations at 120, 60 and 30 radius.

H

Crisper and more saturation

J

Retake using Alejandro Tombolini’s HSV repair prior to stretch to preserve star cores, and used galaxy halo masks.

Sky plot

Sky plot

Histogram

M81 and M82 again, 





    
        

            SJK