This latest outburst was a big one but it has had no detectable effect
(so far) on the motion of the very massive nucleus of 12P. This plot
shows astrometric residuals from three stations (970, I79 and I81) with
an orbit fit using Findorb that uses positions up to Nov 14. You can see
that there is a large temporary displacement of the residuals on Nov 15
and 16. This is due to the biasing of the centroid of the coma by the
very bright dust cloud moving NE from the nucleus. As this dust cloud
fades the astrometry is returning to normal.

Nick.