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Contains:  NGC 5195, Whirlpool galaxy, M 51, NGC 5194
Getting plate-solving status, please wait...
M51 enhanced with Ha and SII, 


            Andreas Dietz
M51 enhanced with Ha and SII

M51 enhanced with Ha and SII

Technical card

Resolution: 1026x1062

Dates:March 30, 2017March 31, 2017Feb. 24, 2018

B+W 486 UV/IR block: 314x30" ISO1600
Baader Planetarium Ha 36mm 7nm: 496x30" (gain: 270.00) -3C bin 1x1
Baader Planetarium SII 36mm 8nm: 406x30" ISO25600

Integration: 10.1 hours

Avg. Moon age: 5.03 days

Avg. Moon phase: 28.78%

Temperature: -8.00 job: 1959472

RA center: 202.489 degrees

DEC center: 47.229 degrees

Pixel scale: 1.067 arcsec/pixel

Orientation: 357.685 degrees

Field radius: 0.219 degrees

Locations: Home Observatory, Regensburg, Bavaria, Germany

Data source: Backyard


Last but not least here is another enhancement of my whirlpool image. I've found some experimental SII narrowband data. It was almost empty, but a few central parts were different to the Ha channel, so I decided to make an overlay using a yellow mask.

That's the current color mapping :
R = Red (Bayer CFA) + Halpha + SII
G = Green (Bayer CFA) + SII
B = Blue (Bayer CFA)




Andreas Dietz
License: Attribution-ShareAlike Creative Commons


  • M51 enhanced with Ha and SII, 


            Andreas Dietz
  • Final
    M51 enhanced with Ha and SII, 


            Andreas Dietz


cropped to same FOV as in the hydrogen enhanced image

Sky plot

Sky plot


M51 enhanced with Ha and SII, 


            Andreas Dietz