NGC 6543 (Robert.S)

Celestial hemisphere: Northern · Constellation: Draco (Dra) · Contains: Cat's Eye Nebula · NGC 6543

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NGC 6543

Link: https://www.astrobin.com/mjqbvt/?nc=user For center section overlay added.

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NGC 6543

Link: https://www.astrobin.com/mjqbvt/?nc=user For center section overlay added.

1897 memoir, which reflect Herschel's ideas and reveal his thrill at his great discovery:

"On the evening of August 29, 1864, I directed the telescope...to a planetary nebula in Draco. The reader may be able to picture to himself...the feeling of excited suspense, mingled with a degree of awe, with which, after a few moments of hesitation, I put my eye to the spectroscope. Was I not about to look into a secret place of creation?

I looked into the spectroscope. No such spectrum as I expected! A single bright line only! ... The light of the nebula was monochromatic, and so, unlike any other light I had yet subjected to prismatic examination, could not be extended out to form a complete spectrum...A little closer looking showed two other bright lines on the side towards the blue. The riddle of the nebulae was solved. The answer, which had come to us in the light itself, read: Not an aggregation of stars, but a luminous gas" [emissions being characteristic of hot gases under low pressure].

Huggins had discovered an emission line of hydrogen in the blue part of the spectrum and two "mystery lines" in the green that were later thought to come from an unknown element called "nebulium." Among the strongest emissions in planetary nebulae, the "nebulium" lines were finally found by I. S. Bowen in 1928 to be emissions of doubly-ionized oxygen.

Original
B
C
Final
D

ZWO ASI183/QHY183

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Basic success
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Astrometry.net job	4398664
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