Orbital Clustering in the Distant Solar System

@article{Brown2019OrbitalCI,
  title={Orbital Clustering in the Distant Solar System},
  author={Michael E. Brown and Konstantin Batygin},
  journal={The Astronomical Journal},
  year={2019},
  volume={157}
}
The most distant Kuiper Belt objects (KBOs) appear to be clustered in longitude of perihelion and in orbital pole position. To date, the only two suggestions for the cause of these apparent clusterings have been either the effects of observational bias or the existence of a distant giant planet in an eccentric inclined orbit known as Planet Nine. To determine if observational bias can be the cause of these apparent clusterings, we develop a rigorous method of quantifying the observational… 
Orbital Precession in the Distant Solar System: Further Constraining the Planet Nine Hypothesis with Numerical Simulations
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The Orbit of Planet Nine
The existence of a giant planet beyond Neptune—referred to as Planet Nine (P9)—has been inferred from the clustering of longitude of perihelion and pole position of distant eccentric Kuiper belt
Injection of Inner Oort Cloud Objects into the Distant Kuiper Belt by Planet Nine
The outer solar system exhibits an anomalous pattern of orbital clustering, characterized by an approximate alignment of the apsidal lines and angular momentum vectors of distant, long-term stable
OSSOS. XV. Probing the Distant Solar System with Observed Scattering TNOs
TLDR
It is confirmed that observed scattering objects cannot solely originate from the classical Kuiper belt, and it is shown that both the Oort cloud and a distant planet generate observable highly inclined scatterers.
A Lopsided Outer Solar System?
Axisymmetric disks of eccentric orbits in near-Keplerian potentials are unstable and undergo exponential growth in inclination. Recently, Zderic et al. showed that an idealized disk then saturates to
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