As Brian Carcich noted, you will need to learn and use SPICE. There is a bit of a learning curve, but it is well worth it. You can find the latest kernel here. The latest CATT_*.BC file has the detailed orientation and rotation information for the comet. It looks like a new one is uploaded every three or four days. Look at the readme there for some information on how to use it.

As Brian Carcich noted, you will need to learn and use SPICE. There is a bit of a learning curve, but it is well worth it. You can find the latest kernel here. The latest CATT_*.BC file in that directory has the detailed orientation and rotation information for the comet. It looks like a new one is uploaded every three or four days. Look at the readme there for some information on how to use it.