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Griffin Images of Comet Hale-Bopp


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Observer: Ian Griffin
Location: Astronaut Memorial Planetarium & Observatory, Cocoa, Florida
Date: March 22, 1997 10:46 UT

Despite terrible conditions (cloud, clearing only 10 minutes before the end of twilight!) I managed to shoot off some pictures for the first time in a few days. Focus on the telescope is poor.

First image is a 30 second exposure of comet Hale-Bopp. Exposure started at 05:45:39 EST. A 12 inch Maksutov telescope, working at a focal ratio of f5 was used with an SBIG ST8 CCD camera and a red filter. The CCD was used in medium resolution mode, with 2 by 2 binning, giving a resultant pixel size of 18 microns. The field of view is 0.3 degrees (long axis) by 0.2 degrees (short axis). Second image is a false colour version of the above image.

Third image is the original 30 second exposure used to make the top image on this page has been flat fielded and dark subtracted. The image has been processed using Mira. A 20 by 20 median filtered masked image was subtracted from 105% of the original. A false colour pallate was then added. The fourth image is the original 30 second image has been processed to reveal structure in the come's coma.

Ian Griffin

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