NAKED-EYE COMET: Comet Pan-STARRS (C/2011 L4) is now inside the orbit of
Mercury and it is brightening as it approaches the sun. Observers in
the southern hemisphere say the comet can be seen with the naked eye
even through city lights. Currently, it is about as bright as the stars
of the Big Dipper (magnitude +2 to +3). The comet could become even
brighter when it moves into northern hemisphere skies in the second week
of March. Check http://spaceweather.com for current images and updates.