Explanation: Comet McNaught, the Great
Comet of 2007, grew a spectacularly long and filamentary tail. The magnificent
tail spread across the sky and was visible for several days to Southern
Hemisphere observers just after sunset. The amazing tail showed its greatest
extent on long-duration, wide-angle camera exposures. During some times, just
the tail itself estimated to attain a peak brightness of magnitude -5 (minus
five), was caught by the comet's discoverer in the above image just after
sunset in January 2007 from Siding Spring Observatory in Australia. Comet
McNaught, the brightest comet in decades, then faded as it moved further into
southern skies and away from the Sun and Earth. Within the next two weeks of
2013, rapidly brightening Comet ISON might sprout a tail that rivals even Comet
McNaught.
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