How to determine atmospheric extinction
Use this table to refine your comet observing.
October 26, 2009
In the December 2009 issue, I wrote the story, "How to observe comets." In it, I suggest all observers estimate how bright a comet appears. To get the whole picture, however, you must factor in one other thing.
This photograph of Comet Halley was taken during its closest pass by Earth — 39 million miles.
Photo by NOAO
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