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Contains:  NGC 6552
Getting plate-solving status, please wait...

NGC 6543 • Cat's Eye Nebula in HaOIIIRGB

Technical card

Dates:May 3, 2020May 6, 2020May 30, 2020May 31, 2020June 1, 2020June 6, 2020

Astrodon OIII 3nm: 135x60" (gain: 0.00) -20C bin 1x1
Astrodon OIII 3nm: 315x120" (gain: 200.00) -20C bin 1x1
Astronomik Deep-Sky B: 63x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky G: 60x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky R: 60x60" (gain: 0.00) -20C bin 1x1
Astronomik Ha 6nm 1.25'': 137x60" (gain: 0.00) -20C
Astronomik Ha 6nm 1.25'': 359x120" (gain: 200.00) -20C bin 1x1

Integration: 30.0 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 11.00 days

Avg. Moon phase: 78.66%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 3589631

RA center: 17h 58' 55"

DEC center: +66° 37' 8"

Pixel scale: 0.649 arcsec/pixel

Orientation: 320.830 degrees

Field radius: 0.240 degrees

Resolution: 2146x1583

Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


This proved to be a major challenge. The core is so bright and had to layer in three different sets of data in Ha and OIII at different exposures. I then added in RGB stars.

The Cat's Eye Nebula (also known as NGC 6543 and Caldwell 6) is a 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.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


NGC 6543 • Cat's Eye Nebula in HaOIIIRGB, 


            Douglas J Struble