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Contains:  NGC 5195, Whirlpool galaxy, M 51, NGC 5194
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M51 Halo - Luminance, 





    
        

            Andreas Dietz
M51 Halo - Luminance

M51 Halo - Luminance

Technical card

Resolution: 1056x980

Dates:April 17, 2018May 19, 2018

Frames:
B+W 486 UV/IR block: 348x15" (gain: 270.00) bin 1x1
B+W 486 UV/IR block: 660x30" (gain: 270.00) 16C bin 1x1

Integration: 7.0 hours

Avg. Moon age: 3.00 days

Avg. Moon phase: 11.88%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 2125360

RA center: 202.477 degrees

DEC center: 47.221 degrees

Pixel scale: 1.915 arcsec/pixel

Orientation: 179.341 degrees

Field radius: 0.383 degrees

Locations: Home Observatory, Regensburg, Bavaria, Germany

Data source: Backyard

Description

My little series with different views of M51 goes on. Today I have a luminance channel image (cropped) for you. I had the idea to capture the faint halo around the twisted galaxies with my simple equipment in my light polluted backyard. After some hours of unguided 30s exposures the halo appeared quite well and the details in the galaxies are also not that bad :-) The ASI178 seems to be really well matched to the Samyang. Dreaming of the ASI183...
Enjoy!

Update 05-10-2018: In the previous version there was some blur in one direction, just like a tracking artifact. It has been stacked with DSS 3.6.6, so I decided to give Fitswork a try (version B and C). And voila - the stacking is much better than in DSS. Does anyone have a possible explanation? In Fitswork I selected only two stars for the alignment, whereas DSS worked with 200 stars...!!?

Version C: This is the final version showing the complete FOV. I also made some improvements to my processing workflow, especially the setting of StarTool's wavelet noise filter. Have a look at the full resolution image, it's really worth it!

Enjoy!

Update 07-02-2018: version E is a combination of the original 5.5 hours image for the Halo and a new image of the core, merged in PS. The new image was taken at F/2.8 to improve the resolution. The finalized stack is a superresolution image (2x drizzling).

Comments

Author

dakloifarwa
Andreas Dietz
License: Attribution-ShareAlike Creative Commons
8971
Like

Revisions

  • M51 Halo - Luminance, 





    
        

            Andreas Dietz
    Original
  • M51 Halo - Luminance, 





    
        

            Andreas Dietz
    B
  • M51 Halo - Luminance, 





    
        

            Andreas Dietz
    C
  • M51 Halo - Luminance, 





    
        

            Andreas Dietz
    D
  • Final
    M51 Halo - Luminance, 





    
        

            Andreas Dietz
    E

B

semi-automatically stacked with Fitswork (2-star alignment)

C

final version, uncropped

D

crop of the final version C, just to compare it to my previous two attempts

E

merged version (see description)

Sky plot

Sky plot

Histogram

M51 Halo - Luminance, 





    
        

            Andreas Dietz