Improvement of the position of planet X based on the motion of nearly parabolic comets

Based on the motion of nearly parabolic comets, we have improved the position of planet X in its orbit obtained by Batygin and Brown (2016). By assuming that some of the comets discovered to date could have close encounters with this planet, we have determined the comets with a small minimum orbit intersection distance with the planet. Five comets having hyperbolic orbits before their entry into the inner Solar system have been separated out from the general list. By assuming that at least one of them had a close encounter with the planet, we have determined the planet's possible position. The planet's probable ephemeris positions at the present epoch have been obtained by assuming the planet to have prograde and retrograde motions. In the case of a prograde motion, the planet is currently at a distance Delta whose value belongs to the interval Delta a (1110, 1120) AU and has a right ascension alpha and declination delta within the intervals alpha a (83au broken vertical bar, 90au broken vertical bar) and delta a (8au broken vertical bar, 10au broken vertical bar); the true anomaly upsilon belongs to the interval upsilon a (176au broken vertical bar, 184au broken vertical bar). In the case of a retrograde motion: alpha a (48au broken vertical bar, 58au broken vertical bar), delta a (-12au broken vertical bar, -6au broken vertical bar), Delta a (790, 910) AU, and upsilon a (212au broken vertical bar, 223au broken vertical bar). It should be noted that in the case of a retrograde motion of the planet, its ephemeris position obtained from the motion of comets agrees with the planet's position obtained byHolman and Payne (2016) from highly accurate Cassini observations and is consistent with the results of Fienga et al. (2016).