Agreed. In the EU model, this asteroid probably passed through a region where the electrical environment changed. That is, it ran through a current from the Sun. "Alignments" with gas giants would not be a simple matter as the heliospheric current sheet involves curves and arcs which change with the solar cycle, ie - the so called 'ballerina skirt' structure. so looking for straight line alignments may not be a fruitful endeavor. Solar Wind4realScience wrote: It seems to me most likely this quiescent body moved/blundered into a strong EU circuit, most likely solar-planetary. The Usual Suspects would be the gas giant planets and the Sun. So begs the question where were they all in alignment at the precise moment this asteroid became a comet (with its tails, hah)?
Figure 1.30: Heliospheric current sheet: flapping in different phases of the solar cycle.