CCDStack, Photoshop CS w/ the Fits Liberator plugin and Noel Carboni's actions.
CCDStack to calibrate, register,
normalize, data reject & combine sub exposures.
North is to the top.
Comet C/2007 N3 (Lulin), also known as Comet Lulin, is a
non-periodic comet. It was discovered by Ye Quanzhi and Lin Chi-Sheng
from Lulin Observatory. The comet's orbit is nearly in the same
plane as the Earth, moving in the opposite direction and displays a
rare anti-tail. This second tail isn't really a tail, but an
illusion, caused by illuminated trailing dust. This dust becomes
visible, as a tail, when the Earth crosses the comet's orbital plane
with the sunlight illuminating the dust at just the right angle. The
long spiked shape is typical of comet anti-tails.
The bright light, in the upper left corner of the first image, is
from the planet Saturn.