Observer: Ian Griffin
Location: Astronaut Memorial Planetarium & Observatory, Cocoa, Florida
Date: April 4, 1997 00:30-01:00 UT
First image is a 60 second image of Hale Bopp obtained at 00:40 UT using a red filter and a 12 inch Maksutov telescope has been dark subtracted and flat fielded,and a false colour pallate applied.
Second image is 19 20 second images all taken through a blue filter between 00:30 and 01:00 UT have been combined and then processed using a rank order masking technique; a 5x5 pixel mask with rank 60% and amplification 10 was used in this case.
Third image is 19 20 second exposures of Hale Bopp, taken through a blue filter between 00:50 and 01:00 UT have been combined and processed using a rotational gradient filter, with rotation 10 degrees and amplification 10.
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