“2018 VG18 is much more distant and slower moving than any other observed Solar System object, so it will take a few years to fully determine its orbit.” - Scott Sheppard, Carnegie Science Institute.
Sources:
Carnegie Science Press Release: Discovered: The Most-Distant Solar System Object Ever Observed
Carnegie Science Press Release: Solar System's Edge Redefined
Research Paper: EVIDENCE FOR A DISTANT GIANT PLANET IN THE SOLAR SYSTEM
Universe Today: New Dwarf Planet Found in the Outskirts of the Solar System, Giving Astronomers More Ammunition to Search for Evidence of Planet 9