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The common origin of family and non-family asteroids: Implications for meteorites and NEAs

Published online by Cambridge University Press:  13 January 2020

Stanley F. Dermott ,
Dan Li  and
Apostolos A. Christou
Stanley F. Dermott
Affiliation:
University of Florida, Department of Astronomy, Gainesville, FL 32611, USA email: sdermott@ufl.edu
Dan Li
Affiliation:
National Optical Astronomical Observatory Tucson, AZ, USA email: dli@noao.edu
Apostolos A. Christou
Affiliation:
Armagh Observatory and Planetarium, College Hill, Armagh BT61 9DG, UK email: Apostolos.Christou@armagh.ac.uk
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Abstract

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The observed size-frequency distributions (SFDs) of the five major asteroid families in the Inner Main Belt (IMB), defined by Nesvorný (2015) using the Hierarchical Clustering Method (Zappala et al. 1990), are distinctly different and deviate significantly from the linear log-log relation described by Dohnanyi (1969). The existence of these differences in the SFDs, and the fact that the precursor bodies of the major families have distinctly different eccentricities and inclinations, provides an explanation for the observations that the mean sizes of both the family and the non-family asteroids are correlated with their mean proper eccentricities and anti-correlated with their mean proper inclinations. We deduce from this, and from the fact that the SFDs of the family and the non-family asteroids are almost identical, that the family and most of the non-family asteroids in the IMB have a common origin (Dermott et al. 2018).

Keywords

Asteroidsminor planets
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S345: Origins: From the Protosun to the First Steps of Life , August 2018 , pp. 281 - 282
Copyright
© International Astronomical Union 2020 

References

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