What Comet Is Currently Visible from Some Spot on Earth?

Answer

As of September 2011, some of the comets that could be seen from any spot on earth were P/2007 R5 SOHO, C2010 X1 Elenin, 45P Honda-Mrkos-Pajdusakova and C/2009 P1 Garradd. These were able to be seen brighter than magnitude 12. However, some comets are best visible by use of a telescope.
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