Comets are notoriously difficult beasts to predict how bright they may become so any prediction of their magnitude in Nightscenes has to be taken with this in mind. Still it is worth including any known comet that may have a chance at becoming visible in binoculars or even naked eye and, at the time of writing the book, two of them occur for the second half of 2018. So we have Comet 21P/Giacobini-Zinner and Comet 46P/Wirtanen to look forward to with the latter potentially becoming naked eye!.

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