At the same time the history of tail development for past very bright sungrazing and sun-skimming comets indicates that maximum visual tail length usually occurs
when the nucleus is between 0.8 and 1.0 AU from the Sun if projection circumstances are reasonably favorable.
For comet 2012 S1 this should occur late in December with the comet circumpolar from higher Northern Hemisphere latitudes and with the comet’s nucleus nearest Earth. The waxing December moon will pose a problem in the evening sky from about the 7th until a few days past its full phase on December 22. I hesitate to make mention of the fact, recalling events surrounding Comet Cunningham in 1940 and Comet Kohoutek in 1973, but night of comet 2012 S1 most spectacular visual display could well be December 24th or 25th 2013.
Snowave wrote:very cool timelapse of the 2 comets.. and an aurora down under.
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