Comet Encke will be passing by Mercury on the 18th at 5:30 AM est, then ISON will pass by it on the 19th.
NASA's messenger at Mercury will be taking pictures of the flybys. But will they actually release any of them? I won't hold my breath since they haven't released any pictures of ISON so far.
from site: MESSENGER Detects Comets ISON and Encke, Prepares for Closer Encounters
NASA's
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