This image shows Comet 17P/Holmes, imaged on November 7, 2007 in Perseus.
This image is a color composite of stacks of 8 sixty-second exposures taken through luminance filter,
and stacks of 4 sixty-second exposures taken through red, green and blue filters.
The images were stacked using the comet nucleus as a reference, allowing the stars to trail as the comet moved.
The images were calibrated, defect-corrected, stacked, color-combined and auto-balanced using AIP4Win Version 2.
The image has been strongly gammalog-stretched to try to show the details in the comet's tail,
which, along with the blue-green halo, have slightly dissipated.