Six months before Harrington died of throat cancer in 1992, astronomer Myles Standish showed that the supposed discrepancies in the planets' orbits were illusory, the product of overestimating the mass of Neptune. When Neptune's newly determined mass was used in the Jet Propulsion Laboratory Developmental Ephemeris (JPL DE), the supposed discrepancies in the Uranian orbit, and with them the need for a Planet X, vanished. There are no discrepancies in the trajectories of any space probes such as "Pioneer 10", "Pioneer 11", "Voyager 1", and "Voyager 2" that can be attributed to the gravitational pull of a large undiscovered object in the outer Solar System. Today astronomers accept that Planet X, as originally defined, does not exist.