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Contains:  M 101, NGC 5457
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M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
M 101 - The Pinwheel Galaxy

M 101 - The Pinwheel Galaxy

Technical card

Resolution: 2055x1838

Dates:April 6, 2018April 7, 2018April 11, 2018April 16, 2018

Frames:
Baader Planetarium B-CCD 1.25": 96x60" (gain: 139.00) -20C bin 1x1
Baader Planetarium B-CCD 1.25": 56x90" (gain: 75.00) -20C bin 1x1
Lumicon Deep Sky 1.25": 275x60" (gain: 139.00) -20C bin 1x1
Lumicon Deep Sky 1.25": 233x90" (gain: 75.00) -20C bin 1x1
Baader Planetarium G-CCD 1.25": 85x60" (gain: 139.00) -20C bin 1x1
Baader Planetarium G-CCD 1.25": 53x90" (gain: 75.00) -20C bin 1x1
Baader Planetarium Ha 1.25" 7nm: 42x150" (gain: 200.00) -20C bin 1x1
Baader Planetarium R-CCD 1.25": 94x60" (gain: 139.00) -20C bin 1x1
Baader Planetarium R-CCD 1.25": 57x90" (gain: 75.00) -20C bin 1x1

Integration: 20.9 hours

Darks: ~30

Flats: ~20

Bias: ~76

Avg. Moon age: 16.85 days

Avg. Moon phase: 36.53%

Bortle Dark-Sky Scale: 6.00

Temperature: 10.33

Astrometry.net job: 2035106

RA center: 210.779 degrees

DEC center: 54.346 degrees

Pixel scale: 1.081 arcsec/pixel

Orientation: 96.662 degrees

Field radius: 0.414 degrees

Data source: Backyard

Comments

Author

Epox
Andrea Alessandrelli
License: None (All rights reserved)
3092
Like

Revisions

  • M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
    Original
  • M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
    M
  • M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
    S
  • M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
    T
  • M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
    U
  • M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
    V
  • M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
    X
  • M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
    Z
  • Final
    M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli
    BA

M

I added more data but also removed the Ha channel that was of poor quality. I still would like to integrate more data, expecially to reduce the backround gradients and improve the colors.

S

I added more data for luminance and color, it allowed me to apply more denoise while preserving details. The fist night on this object was terrible and there are still background brightness gradients; probably there are more than a couple of exposures I should get rid of by looking at them. I also added a couple of processes to my PI workflow and it took me more than one day to process all the data. . (sigh) . I really like how the core came out, it's quite a sight in full screen!

T

I completely removed the luminance data from 6 and 7 April.

U

I reused the old data, obtained a better result than before especially on color saturation. Pity for the messy background. I still have to re-stack the exposures with linear fit clipping in pixinsight and see if there's any improvement on the gradients.

V

Added again the Ha Channel to the image.

X

Fixed some background color noise

Z

I created a custom mask and applied curves transformation to the core only, in order to highlight the spiral arms. I provided some color to the smallest stars and removed some chrominance here and there. I am also trying out a little white border as an experiment, to see how it looks on the website. Z is the last letter and this is the last version.. I don't want to process this picture anymore, it's been long and hard work.

BA

Reprocessed with my actual workflow.

Sky plot

Sky plot

Histogram

M 101 - The Pinwheel Galaxy, 





    
        

            Andrea Alessandrelli