What do you define as a planet though?
If you consider our sun a frame of reference, you might find that technically some far away objects bigger than the sun have complex periodical movements around the sun.
I think that's an interesting question, but the search being described is for a fairly specific kind of object with constrained parameters: https://en.wikipedia.org/wiki/Planet_Nine
definition of a planet as follows: a planet is what ever arbitrary metrics Brown can come up with that demotes Pluto and includes the other 8 (sort of) so that he can write papers / gain fame / etc. They didn't come up with criteria and found Pluto didn't fit, they kept coming up with criteria UNTIL Pluto didn't fit and the other planets did fit.
Brown has no army over me, and I don't buy into the academic nonsense. Pluto is a planet.
