Planet Nine Predicted to Have 665 AU Semi Major Axis and 17,117 Year Orbital Period

Coralling a distant planet with extreme resonant Kuiper belt objects

Authors:

Malhotra et al

Abstract:

The four longest period Kuiper belt objects have orbital periods close to small integer ratios with each other. A hypothetical planet with orbital period ∼17,117 years, semimajor axis ∼665 AU, would have N/1 and N/2 period ratios with these four objects. The orbital geometries and dynamics of resonant orbits constrain the orbital plane, the orbital eccentricity and the mass of such a planet, as well as its current location in its orbital path.