http://www.space.com/23591-comet-ison-visibility-naked-eye.html
by Joe Rao, SPACE.com Skywatching Columnist | November 14, 2013
Get ready for a stellar show. The much-anticipated Comet ISON is now visible to the naked eye according to reports from many observers.
Comet ISON — the potential "comet of the century" — has suddenly brightened in an outburst of activity with just two weeks to go before it literally grazes the surface of the sun.
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According to veteran comet observer, John Bortle, Comet ISON was shining only at magnitude +8.5 on Monday (Nov. 11) morning — more than six times too dim to be visible to the unaided eye. But by Wednesday morning, the comet’s brightness had increased three-fold brightening to +7.3.
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The comet is rapidly approaching its Nov. 28 perihelion and as a result it is becoming more and more difficult to observe low near the east-southeast horizon in the dawn sky. Still, observers with access to a clear horizon may be able to follow ISON for about another week.
Next Monday morning (Nov. 18), ISON will be passing close to the bright 1st magnitude star Spica in Virgo. Using the handle of the Big Dipper, sweep an arc to the brilliant orange star Arcturus. Then continue that arc on to Spica. Using binoculars, ISON should still be readily be visible as a fuzzy star with a short tail.
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