Hemisphere:  Northern  ·  Constellation: Draco (Dra)  ·  Contains:  IC 4677  ·  NGC 6543

Image of the day 03/17/2019

    NGC6543 - The Cat's Eye, 



    
        

            Jason Guenzel
    NGC6543 - The Cat's Eye
    Powered byPixInsight

    NGC6543 - The Cat's Eye

    Image of the day 03/17/2019

      NGC6543 - The Cat's Eye, 



    
        

            Jason Guenzel
      NGC6543 - The Cat's Eye
      Powered byPixInsight

      NGC6543 - The Cat's Eye

      Technical card

      Imaging telescopes or lenses: CELESTRON EdgeHD 800

      Imaging cameras: ZWO ASI1600MM-Cool

      Mounts: Orion Atlas Pro AZ/EQ-G

      Guiding telescopes or lenses: CELESTRON EdgeHD 800

      Guiding cameras: ASI120MM

      Focal reducers: Celestron 0.7x Focal Reducer

      Software: Sequence Generator Pro  ·  PixInsight  ·  Adobe Lightroom  ·  Adobe Photoshop  ·  PHD 2

      Filters: Astronomik Deep-Sky R 1.25"  ·  Astronomik Deep-Sky B 1.25"  ·  Astronomik Deep-Sky G 1.25"  ·  Astronomik L-3 UV-IR Block 1.25"  ·  Astronomik H-alpha 6nm CCD 1.25"  ·  Astronomik OIII 6nm CCD 1.25"

      Accessory: Moonlite CHL 2.5" Large Format Crayford Edge Focuser  ·  Orion Thin Off-Axis Guider (TOAG)


      Dates:April 29, 2018April 30, 2018May 1, 2018May 4, 2018May 5, 2018May 7, 2018May 8, 2018May 21, 2018June 24, 2018June 25, 2018Sept. 23, 2018Sept. 26, 2018Sept. 27, 2018Oct. 8, 2018Oct. 15, 2018Oct. 18, 2018

      Frames:
      Astronomik Deep-Sky B 1.25": 25x240" (1h 40') (gain: 0.00) -20C bin 1x1
      Astronomik Deep-Sky G 1.25": 25x240" (1h 40') (gain: 0.00) -20C bin 1x1
      Astronomik Deep-Sky R 1.25": 25x240" (1h 40') (gain: 0.00) -20C bin 1x1
      Astronomik H-alpha 6nm CCD 1.25": 101x240" (6h 44') (gain: 139.00) -20C bin 1x1
      Astronomik H-alpha 6nm CCD 1.25": 28x60" (28') (gain: 139.00) -20C bin 1x1
      Astronomik L-3 UV-IR Block 1.25": 100x180" (5h) (gain: 0.00) -20C bin 1x1
      Astronomik OIII 6nm CCD 1.25": 123x240" (8h 12') (gain: 139.00) -20C bin 1x1
      Astronomik OIII 6nm CCD 1.25": 30x60" (30') (gain: 139.00) -20C bin 1x1

      Integration: 25h 54'

      Darks: ~50

      Flats: ~50

      Bias: ~256

      Avg. Moon age: 15.58 days

      Avg. Moon phase: 73.23%

      Bortle Dark-Sky Scale: 5.00


      Basic astrometry details

      Astrometry.net job: 2575329

      RA center: 17h 59' 0"

      DEC center: +66° 37' 40"

      Pixel scale: 0.526 arcsec/pixel

      Orientation: 128.568 degrees

      Field radius: 0.208 degrees


      Resolution: 2008x2008

      Data source: Backyard

      Description

      About 3000 light years from us, in the constellation Draco, lies the Cat's Eye Nebula. This planetary nebula consists of several layers and structures. The innermost core contains several bubbles that were created at various parts of the planetary nebula stage. These consist of hydrogen, primarily, and are currently being shaped by the intense stellar wind. The visible central star is known as an "asymptotic giant branch" star with a type of Wolf-Rayet spectra. This means it a hydrogen-depleted star with a bare carbon-oxygen core. In fact, the entire planetary nebula was formed through the evolution of this star from its red giant phase to its current state. The original main sequence star likely wasn't too different from our own sun.

      During the red giant stage, shells of hydrogen and oxygen were shed during pulsations of the upper atmosphere. Outside the core these can be seen as regular concentric rings, while further out it gives rise to the spider web tangle of the outer nebula.

      Yes ... this image was a long time in the making and processing! But, I'm happy with the result here. The image could be written as HaOIIILRGB and is a collection of 6 channels of data. The data was balanced to give a roughly natural color palette and given an HDR treatment to make the core visible and not completely saturated. The core is very bright compared to everything else in the field. I also chose to frame NGC 6552, which is an interesting little galaxy about 350 million light years distant.

      As always, enjoy!

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