Hypothetical 9th planet

Scientists claim that they have evidence for (but not observed) a new ninth planet of our solar system. This planet would be about the size of Neptune, and would orbit the sun about every 15,000 years. It’s closest approach to the sun (perihelion) would be about 200 AU out from the sun (200 times the distance from the Earth to the sun), while its furthest distance (aphelion) could be from 600 to 1200 AU.

(DATA) JPL; BATYGIN AND BROWN/CALTECH; (DIAGRAM) A. CUADRA/SCIENCE