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Visual Observing

2004 BL86 rate of speed
Author Last Post
Here is another image of 2004 BL86.  This is a composite of two images, the 1st and 12th, of a set taken the night of 1-26-2015 local.  The time, RA & Declination of the comet are shown for each image.  I thought some might enjoy calculating the rate of motion of the comet in arcseconds per second.

Willie


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