or how about having one called simply "planet x" in the paranormal and supernatural. Or has that been done.
And richard please if you're going to make wild claims about the path of planets on an elliptical orbit at least check your facts. Sitchin has already stated several times that it passes near jupiter. I do agree though on your one point.
"A theoretical Planet X chuntering around could miss it by millions of miles."
Some would say billions of miles, light years even.