Cat’s Eye Nebula (NGC 6543)
The Cat’s Eye Nebula or NGC 6543, is a planetary nebula in the constellation of Draco at magnitude 8.1 with high surface brightness, discovered by William Herschel in 1786. While the brighter inner nebula is rather small (16″ * 25″), it has an extened halo of matter that the progenitor star ejected during its red giant phase. This halo extends over a diameter of about 300″. The cat’s Eye nebula lies three thousand light-years from Earth.
The image is a combination of broadband LRGB and narrowband Ha/OIII images. Long exposed Ha/OIII where used to display the faint, outer halo of the PN. To reveal the structure of the small, very bright center, a short exposed RGB was blended over the ‘wide-field’ image.
[description from wikipedia]