> Brown argues that this object is not likely to be Planet Nine because its orbit would be far more tilted than what is predicted for the undiscovered world. In other words, a planet in this position would not have the observed effects on the Solar System. In fact, a planet in this orbit would make the calculated Planet Nine orbit itself unstable, which would eliminate Planet Nine altogether. Is there an entirely different planet out there? Future observations will have to sort this out.
There's also an alternative lesser known proposal for an undetected massive object in the outer solar system, by Lykawka and Mukai[1], ofter confounded with the planet nine hypothesis, but it is actually an independent proposal from the object predicted by Batygin and Brown. I wonder if despite not being compatible with the more known planet nine proposal, the recent finding may be compatible with the one from Lykawka et al, or it may even be the case that the former acts in tandem with the later, and we actually have two real objects making the work of the virtual single planet proposed by B&B.
There's also an alternative lesser known proposal for an undetected massive object in the outer solar system, by Lykawka and Mukai[1], ofter confounded with the planet nine hypothesis, but it is actually an independent proposal from the object predicted by Batygin and Brown. I wonder if despite not being compatible with the more known planet nine proposal, the recent finding may be compatible with the one from Lykawka et al, or it may even be the case that the former acts in tandem with the later, and we actually have two real objects making the work of the virtual single planet proposed by B&B.
[1] https://iopscience.iop.org/article/10.1088/0004-6256/135/4/1...