# Could Planet X have a perihelion much closer than 300 AU and still be responsible for the gravitational interaction with 19 TNOs?

In August, Michael Brown and Konstantin Batigyn proposed new data concerning the hypothetical Planet X to explain the orbits of the 19 TNOs. They suggest a perihelion of 300 AU, but might Planet X be even much closer? Is there something like a minimum perihelion it must have to account for the TNOs' highly elliptical orbits?

• This is a proper science based question. I voted up to encourage you to post more questions like this rather than your previous one. Oct 19, 2021 at 21:08

Well yes, because Brown & Batygin (2021) say the perihelion would be $$300^{+85}_{-60}$$ au, so there is roughly a 50% chance that the perihelion is smaller than 300 au according to their work.