No, no more than you would need to be worried about the discovery of Neptune in the nineteenth century. It orbits at least three times further than Neptune at its closest.
See also my Why This New "Planet X" Is No Threat To Earth :).
About the Author
Robert Walker
Writer of articles on Mars and Space issues - Software Developer of Tune Smithy, Bounce Metronome etc.Studied at Wolfson College, Oxford
Lives in Isle of Mull
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