ASTEROID FAMILY IDENTIFICATION USING THE HIERARCHICAL CLUSTERING METHOD AND WISE/NEOWISE PHYSICAL PROPERTIES

@article{Masiero2013ASTEROIDFI,
  title={ASTEROID FAMILY IDENTIFICATION USING THE HIERARCHICAL CLUSTERING METHOD AND WISE/NEOWISE PHYSICAL PROPERTIES},
  author={Joseph R. Masiero and Amy K. Mainzer and James M. Bauer and T. Grav and C. R. Nugent and Rachel Stevenson},
  journal={The Astrophysical Journal},
  year={2013},
  volume={770},
  pages={7}
}
Using albedos from WISE/NEOWISE to separate distinct albedo groups within the Main Belt asteroids, we apply the Hierarchical Clustering Method to these subpopulations and identify dynamically associated clusters of asteroids. While this survey is limited to the ~35% of known Main Belt asteroids that were detected by NEOWISE, we present the families linked from these objects as higher confidence associations than can be obtained from dynamical linking alone. We find that over one-third of the… 
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TLDR
A 4-billion-year-old asteroid family is discovered extending across the entire inner part of the main belt whose members include most of the dark asteroids previously unlinked to families, allowing some original planetesimals to be identified, supporting the view of asteroids being born big.
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