Rob Hawley's Pages Almaden Observatory Main Page

C/2009 P1 Garradd

Sept 2011 and Feb 2012

I caught this periodic comet twice.  Both were stacked using "comet mode" in DSS and then processed with PixInsight.

Feb 5 2012

The February picture clearly shows two tails.  One at 2 o'clock and the other at 8 o'clock.  Unfortunately weather prevented me from capturing the comet passing M 92 which occurred 2 nights prior to this image.  M 92 is just out of frame in these images. This consist of 14 images of 240 seconds each

The two images below were obtained using the same data and varying the processing technique.  In the left image the background stars are preserved.  That creates a pretty picture, but the fine details of the comet are blurred.  In the right picture the registration is centered on the comet.  This improves the S/N ratio of the dimmer portions allowing the two tails to stand out.

Feb 2012 Garradd showing stars
Garradd Comet Centered
Feb 5 2012 Image preserving stars
Feb 5 2012 centered on Comet

September 2011

Only one tail was visible at this time.

Garradd Sept 11

This page describes the orbit of the comet.

Copyrights for Photos

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Except as noted, all work on this site by Robert J. Hawley is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. This permits the non commercial use of the material on this site, either in whole or in part, in other works provided that I am credited for the work.