The Cat’s Eye (NGC 6543) is a planetary nebula in the constellation Draco. Thanks to the Hubble Space Telescope, during the last years it was possible to determine the exact distance from the Earth, which is about 3600 light years.
The nebula was discovered on February 15, 1786 by William Herschel.
The relative brightness of the nebula is 8.1 mag. The cat’s eye has a very complex structure. The central star of the Cat Nebula is about 10,000 times brighter than our Sun! And its diameter is 0.65 times larger than that of our Sun.