Astroblog: Revised Comet C/2009 P1 Garradd near NGC 4236-1

Friday, March 16, 2012

Revised Comet C/2009 P1 Garradd near NGC 4236-1 - March 14, 2012

A revisiting of my images from the 14th. Here I've used 8 x 120 second images (dumping two that were cloud affected) instead of 5, stretched with FITS liberator, and stacked then SUMMED with ImageJ, then despeckled using default settings. Click to embiggen.

The left image is the result of that process, and the right image had a square root transform applied to it. Compare with the result of stacking just 5 images here. Galaxy detail is better, comet definition cold be better. Compare it with Rolando Ligustri's image from the same night.

Labels: C/2009 P1 Garradd, comet, iTelescope