Hemisphere:  Northern  ·  Constellation: Lyra (Lyr)  ·  Contains:  IC 1296  ·  M 57  ·  NGC 6720  ·  Ring Nebula

Image of the day 07/25/2021

Getting plate-solving status, please wait...
    M57 with outer shells (HaO3O3 with RGB stars), 



    
        

            Andreas Eleftheriou
      M57 with outer shells (HaO3O3 with RGB stars), 



    
        

            Andreas Eleftheriou

      M57 with outer shells (HaO3O3 with RGB stars)

      Image of the day 07/25/2021

      Getting plate-solving status, please wait...
        M57 with outer shells (HaO3O3 with RGB stars), 



    
        

            Andreas Eleftheriou
          M57 with outer shells (HaO3O3 with RGB stars), 



    
        

            Andreas Eleftheriou

          M57 with outer shells (HaO3O3 with RGB stars)

          Imaging telescopes or lenses: Skywatcher Esprit 150ED Super APO Triplet Esprit 150ED Super APO Triplet

          Imaging cameras: ZWO asi 2600 MC  ·  QSI 690WSG-8

          Mounts: Software Bisque MYT

          Guiding cameras: ZWO ASI 290MM Mini

          Software: StarKeeper.it Voyager  ·  Software Bisque The Sky X Pro,  ·  PHD Lab PHD 2  ·  PixInsight

          Filters: AstroDon 5nm H-Alpha filter  ·  AstroDon 5nm Oiii filter

          Accessory: Starlight Xpress AO-LF active optics unit  ·  Moonlite Nitecrawler 2.5


          Dates:July 2, 2021July 3, 2021July 4, 2021July 5, 2021July 6, 2021July 7, 2021July 8, 2021July 9, 2021

          Frames:
          AstroDon 5nm Oiii filter: 40x900" (10h)
          AstroDon 5nm H-Alpha filter: 42x900" (10h 30')

          Integration: 20h 30'

          Avg. Moon age: 25.85 days

          Avg. Moon phase: 17.89%


          Astrometry.net job: 4752309

          RA center: 18h 53' 35"

          DEC center: +33° 1' 40"

          Pixel scale: 0.720 arcsec/pixel

          Orientation: 90.084 degrees

          Field radius: 0.358 degrees


          Resolution: 2984x1988

          Data source: Backyard

          Description

          This was probably the most demanding image processing I experienced! The difference in the Dynamic Range of the core and the outer shell is enormous. I was experimenting with the HDRM tool of PI with several masks in order to unveil the outer shells without exploding the saturation of the core and the stars. After several days of processing I will pause and revisit this another time :-)

          Revision A: HaO3O3 image with RGB stars (mouse over for zoom)
          Revision B: RGB image (mouse over plate solved)
          Revision C: HaO3O3 zoom/cropped/resampled (mouse over for original fov)

          Comments

          Revisions

            M57 with outer shells (HaO3O3 with RGB stars), 



    
        

            Andreas Eleftheriou
            Original
            M57 with outer shells (HaO3O3 with RGB stars), 



    
        

            Andreas Eleftheriou
            B
          • Final
            M57 with outer shells (HaO3O3 with RGB stars), 



    
        

            Andreas Eleftheriou
            C

          B

          Description: RGB image

          Uploaded: ...

          C

          Description: zoom/resampled

          Uploaded: ...

          Sky plot

          Sky plot

          Histogram

          M57 with outer shells (HaO3O3 with RGB stars), 



    
        

            Andreas Eleftheriou