Photometry covering the period July 2007 to March 2008, showing the apparent R-band magnitude of the comet (corrected for rotational phase). The solid line shows the predicted magnitude of the bare nucleus (based on the July 2007 data; Tubiana et al. 2011), with the dashed lines showing the 1σ uncertainty on this. The comet appears to be significantly brighter than expected by November 2007, indicating some unresolved activity within the aperture at this point (at a heliocentric distance of 4.3 AU). By March 2008, when the comet is visibly active in images, the difference is more than 1 mag.
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