Cat's Eye Nebula Diameter. In the center of the cat's eye there. While the bright inner nebula is rather small at 20 arcseconds in diameter , it has an extended halo of matter that the progenitor star ejected during its red giant phase.
Ngc 6543 adalah nebula yang terletak di area rasi bintang draco. If the number is negative, it is west of the march equinox. 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.
The right ascension is the angular distance of an object along the celestial equator from the march equinox.
William huggins' spectroscopic observation of the cat's eye in 1864, revealing a spectrum consisting of three bright lines, provided proof that not all `nebulae' consist. William huggins' spectroscopic observation of the cat's eye in 1864, revealing a spectrum consisting of three bright lines, provided proof that not all `nebulae' consist. The cat eye nebula, ngc 6543, is a mythical object from the deep sky of the northern hemisphere. It is one of the most structurally complex nebulae and perhaps the most spectacular.