Comet 17P/Holmes underwent a huge outburst of some 13-14 magnitudes (the largest ever known for a comet in only a day or two) around 2007 Oct. 24, attaining total visual mag 2.4 +/- 0.2 in the last week of October. It was only slowly declining in brightness as it moved through the constellation Perseus, well placed for northern-hemisphere observers into early 2008.
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