How Sedna and family were captured in a close encounter with a solar sibling

  title={How Sedna and family were captured in a close encounter with a solar sibling},
  author={Lucie J'ilkov'a and Simon Portegies Zwart and Tjibaria Pijloo and Michael F. Hammer},
  journal={Monthly Notices of the Royal Astronomical Society},
The discovery of 2012VP113 initiated the debate on the origin of the Sedna family of planetesimals in orbit around the Sun. Sednitos roam the outer regions of the Solar System between the Egeworth--Kuiper belt and the Oort cloud, in extraordinary wide (a>150au) orbits with a large perihelion distance of q>30au compared to the Earth's (a=1au and eccentricity e=(1-q/a) ~ 0.0167 or q=1au). This population is composed of a dozen objects, which we consider a family because they have similar… Expand

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