I'm not up to speed on the whole orbital path of planetary bodies... But?

Has anybody or is there a know path of Planet X. As we have known date and a orbital period could we extrapelate past visits and place the relative location to earth.

Would we expect different natural disasters if the 'ex' arrived whislt earth was out.

Or would the duration of the visit be across an entire earth orbit and we gonna get more of the same past events.

Can Planet EX be the cause for the extinction of the Dinosaur.

Can the 3600year visits be identified in earth core samples? I would think evidence of massive natural disasters would be present on core samples around the world. And species of prehistoric animals have lived for millions of years with no problems.

I could hunt for answers but it better to ask.