CCDStack, Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions
and Russell Croman's GradientXTerminator
CCDStack to calibrate, register,
normalize, data reject & combine.
North is to the top.
IC 443, the Jellyfish
Nebula, is a Galactic supernova remnant, in the constellation
occurred 8,000 years ago. It is one of the best studied cases of
supernova remnants, interacting with surrounding molecular clouds.
IC 443 spans about 65 light-years at an estimated distance of 5,000
The large expanse, to
the left and to the top of the image, is the emission nebula
Sh2-249... at a distance of 5200 light years.