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Contains:  NGC 6543, IC 4677

Image of the day 05/01/2019

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    NGC 6543 Cat's Eye Nebula, 





    
        

            Jerry Macon
    NGC 6543 Cat's Eye Nebula

    NGC 6543 Cat's Eye Nebula

    Technical card

    Resolution: 2284x1784

    Dates:March 28, 2019April 16, 2019

    Frames:
    Astrodon 36mm Ha (5nm) OIII (5nm): 182x300" (gain: 99.00) -20C bin 1x1
    Astrodon Gen 2 LRGB 36mm: 130x100" (gain: 99.00) -15C bin 1x1

    Integration: 18.8 hours

    Avg. Moon age: 16.94 days

    Avg. Moon phase: 67.54%

    Bortle Dark-Sky Scale: 4.00

    Astrometry.net job: 2653000

    RA center: 269.703 degrees

    DEC center: 66.633 degrees

    Pixel scale: 0.701 arcsec/pixel

    Orientation: 357.644 degrees

    Field radius: 0.282 degrees

    Locations: Dark Star Observatory, Taos, New Mexico, United States

    Data source: Own remote observatory

    Remote source: Non-commercial independent facility

    Description

    Images from the following two scopes (piggybacked) contributed to this image:
    AG12+ASI1600MM at .70 asec/pix
    TV127is+ASI183MM at .75 asec/pix.
    They were all registered to the best Ha image taken on the AG12.
    Using L (synthetic from L+ RGB) from the TV NP127is refractor effectively eliminates the spikes from the AG12.

    Imaged on nights of 3/28/2019, 3/29/2019, 3/30/2019, 4/14/2019, 4/15/2019, 4/16/2019.

    The Cat's Eye Nebula or NGC6543, is a relatively bright planetary nebula in the northern constellation of Draco, discovered by William Herschel on February 15, 1786. It was the first planetary nebula whose spectrum was investigated by the English amateur astronomer William Huggins, demonstrating that planetary nebulae were gaseous and not stellar in nature. Structurally, the object has had high-resolution images by the Hubble Space Telescope revealing knots, jets, bubbles and complex arcs, being illuminated by the central hot planetary nebula nucleus (PNN). It is a well-studied object that has been observed from radio to X-ray wavelengths.
    The Cat's Eye Nebula is structurally a very complex nebula, and the mechanism or mechanisms that have given rise to its complicated morphology are not well understood. The central bright part of the nebular consists of the inner elongated bubble (inner ellipse) filled with hot gas. It, in turn, is nested into a pair of larger spherical bubbles conjoined together along their waist. The waist is observed as the second larger ellipse lying perpendicular to the bubble with hot gas.
    (Wikipedia)

    Comments

    Author

    jmacon
    Jerry Macon
    License: Attribution Creative Commons
    215524
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    NGC 6543 Cat's Eye Nebula, 





    
        

            Jerry Macon