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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 15, 1997 09:46-11:00 UT

First image is a 30 second exposure of comet Hale-Bopp. Exposure started at 04:46:25 EST. A 12 inch Maksutov telescope, working at a focal ratio of f5 was used with an SBIG ST8 CCD camera with no filter. The CCD was used in low resolution mode, with 3 by 3 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 using Mira. A 30 by 30 median filtered masked image was subtracted from 105% of the original. A false colour pallate was then added.

Second image is a 300 second exposure starting at 05:20:38. Taken with a 12 inch f5 telescope, through a lumicon Swann Band filter. Telescope guided on motion of comet during the exposure which accounts for star trails.SBIG ST8 CCD Camera working in medium resolution mode was used to take this picture. Third image is a false colour version of the 2nd image.

Fourth image is a 30 second exposure of comet Hale Bopp through a Swann Band filter has been processed to reveal structure in the inner coma. Exposure started at 05:31:15 EST

Fifth image is a tri colour image made by combining 2 30 second red images, 3 30 second green images and 6 30 second blue images, made between 05:00 and 0:600 EST. Images were taken using an SBIG ST8 CCD camera working in medium resolution mode.

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