Here is a "dark frame" for Cassini raw images as of August 21, 2010.



Yesterday the spacecraft took four shots of a star field in Leo, to the W of Regulus. Here is the stacked view of the starfield images. The Astrometry flickr group provided the coordinates of the star field. There is a link in the comments section to the World Wide Telescope view.

Using the starfield image to which are real stars, I recoordinated on the non-stellar regularly appearing blips and bloops, restacked the images, and clone stamped out the stars (which appeared in a parrelelogram pattern in the final image.


[EDIT: Restacked using "Multiply" blend mode, then contrast-enhanced. Only the consistent blips and bloops show up as white pixels now.]

New version:Click to view attachment