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Contains:  IC 4677, NGC 6543

Image of the day 05/01/2019

Getting plate-solving status, please wait...
NGC 6543 Cat's Eye Nebula, 


            Jerry Macon
NGC 6543 Cat's Eye Nebula
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NGC 6543 Cat's Eye Nebula

Technical card

Dates:March 28, 2019April 16, 2019

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

Basic astrometry details job: 2653000

RA center: 17h 58' 48"

DEC center: +66° 37' 58"

Pixel scale: 0.701 arcsec/pixel

Orientation: 357.644 degrees

Field radius: 0.282 degrees

Resolution: 2284x1784

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

Data source: Own remote observatory

Remote source: Non-commercial independent facility


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.



Jerry Macon
License: Attribution Creative Commons

Sky plot

Sky plot


NGC 6543 Cat's Eye Nebula, 


            Jerry Macon