NGC 6543 - wonderfuluniverse.de

NGC 6543 from Banon, my „Jade“ observatory and from remote

I imaged the famous planetary nebula NGC 6543 several times over the years, each image highlighting a different aspect of this remarkable object.

My first image was acquired in 2011 during a stay in Banon, using my DSLR equipment under the dark skies of Haute-Provence. In 2023, I revisited the nebula from my observatory in Varel, this time employing a high-speed planetary camera to capture the exceptionally bright inner region at much higher resolution. The resulting image resolved the intricate structures surrounding the central star that are difficult to record with conventional deep-sky cameras. My most recent image was created from a deep HORGB dataset acquired in 2024 through Astrophotomarket, combining narrowband Hα data with broadband RGB to reveal both the brilliant inner shell and the extremely faint outer halo.

Located in the constellation Draco at a distance of approximately 3,300 light-years, NGC 6543 is one of the best-known and most extensively studied planetary nebulae in the sky. Better known as the Cat’s Eye Nebula, it was the first planetary nebula ever observed spectroscopically, leading to the discovery that these objects consist of glowing ionized gas rather than unresolved star clusters.

The nebula is the product of a Sun-like star nearing the end of its life. After exhausting its nuclear fuel, the progenitor star expelled its outer layers into space, while its exposed core contracted into a hot white dwarf. The intense ultraviolet radiation emitted by this stellar remnant ionizes the surrounding gas, producing the characteristic emission in Hα, [O III], and [N II] that makes the nebula so spectacular.

NGC 6543 is renowned for its extraordinarily complex structure. The bright central region consists of multiple concentric shells, filaments, knots, and shock fronts created by successive episodes of mass loss during the star’s late evolutionary stages. Surrounding this intricate inner nebula is a much fainter, extended halo that records even earlier phases of stellar evolution. These outer structures require very deep exposures to become visible and provide valuable clues about the history of mass loss from the progenitor star.

The central star has a surface temperature approaching 80,000 Kelvin and is driving a powerful, fast stellar wind that continues to interact with material ejected thousands of years earlier. This interaction produces the complex morphology that has made the Cat’s Eye Nebula one of the most important objects for understanding the formation and evolution of planetary nebulae.

The three images acquired in 2011, 2023, and 2024 complement one another beautifully. The DSLR image captures the nebula within its stellar surroundings, the high-resolution planetary-camera image reveals the astonishing complexity of the bright inner core, and the deep HORGB dataset uncovers the faint outer halo together with the intricate emission structures. Together, they provide a comprehensive portrait of one of the most beautiful and scientifically significant planetary nebulae in the night sky.

For the Astrophotomarket the data the calibration, registration and the final processing was done with PixInsight. The result was as follows:

The images were taken with the following equipment:

Date: 2024
Location: Spain
Telescope: TS-130 APO Refractor
Focal length [mm]: 910
Focal ratio: 7
Mount: ZWO AM5
Camera: ZWO ASI 294MM Pro
Filter: R:G:B:Hα:[OIII]
Exposure time [min]: 30:30:30:385:315
Resolution:1.31″/px

For the 2023 data the calibration, registration and the final processing was done with PixInsight. The result was as follows:

NGC 6543, Varel, 2023 — NGC 6543 ([OII]), Varel, 2023

The images were taken with the following equipment:

Date: 2023
Location: Varel
Telescope: 8″ GSO Newton
Focal length [mm]: 800
Focal ratio: 4
Mount: Skywatcher NEQ6 Synscan
Camera: ASI 178 MM
Filter: [OIII]
Exposure time [min]: 266
Resolution: 0.17″/px

For the 2011 data the calibration and registration was done with DeepSkyStacker and the final processing was done with PixInsight. The result was as follows: