The other interesting point is around January 13-15 the comet is between us and the sun. This situation (small phase angle) can, depending on the composition of the comet, cause forward scattered of sunlight in the comets dust. This in turn temporarily enhances the brightness as has happen to a few comets like Comet Skjellerup-Maristany in 1927 and a few years ago with Comet Machholz 96P in SOHO. It can amount to as much as 5 magnitudes brightness enhancement! There is no guarantee this would happen, so I'll stop right there in case I raise too many hopes
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Terry