Discovery of a Planetary-sized Object in the Scattered Kuiper Belt

  title={Discovery of a Planetary-sized Object in the Scattered Kuiper Belt},
  author={M. E. Brown and Chadwick A. Trujillo and David L. Rabinowitz},
  journal={The Astrophysical Journal Letters},
  pages={L97 - L100}
We present the discovery and initial physical and dynamical characterization of the object 2003 UB313. The object is sufficiently bright that for all reasonable values of the albedo it is certain to be larger than Pluto. Prediscovery observations back to 1989 are used to obtain an orbit with extremely small errors. The object is currently at aphelion in what appears to be a typical orbit for a scattered Kuiper Belt object, except that it is inclined by about 44° from the ecliptic. The presence… 

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