Quote: What is this light point in the lower left part of the core?
The image was taken 10/26/2007 about 11:00 PM CEST (GMT+2). North is left. It's a false-color HDR image produced with IRIS.
It is the nuclear condensation (sometimes called the pseudonucleus). This is the area immediately around the true physical solid nucleus of the comet (the actual nucleus is too small to be resolved from Earth). Clear skies to you.