The closest approach to the Sun has only change slightly this time.
The very long orbital periods are hard to calculate. The thing that is kind of embarrassing for them is that the changes in the last three sets of parameters have been outside the uncertainty ranges from one set to the next. This does suggest the possibility that they are having trouble fitting the data, which would be what would happen if the comet is being slowed a little due to plasma drag, as McCanney has proposed
November 22 Data
November 25 Data