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Griffin Images of Comet Hale-Bopp

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ampo138_s.jpg29K ampo139_s.jpg12K ampo140_s.jpg28K ampo141_s.jpg23K
Observer: Ian Griffin
Location: Astronaut Memorial Planetarium & Observatory, Cocoa, Florida
Date: March 26, 1997 00:15-00:20 UT

First image is a 30 second exposure of comet Hale-Bopp. Exposure started at 19:20 EST on 25th March (which is of course 00:20 UT on 26th March ). 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). The image has been processed by subtracting a 20 by 20 median filtered masked version from the original to reveal structure in the coma.

Second image is the original unprocessed image used to create the first image. Third image is a false colour version of the second image. Fourth image is a 30 second exposure started at 19:15:00 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. To reveal the hood structures near the comet's nucleus.

Ian Griffin
GRIFFIN.I@a1.brevard.cc.fl.us


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