A collisional family of icy objects in the Kuiper belt (original) (raw)

Nature volume 446, pages 294–296 (2007)Cite this article

Abstract

The small bodies in the Solar System are thought to have been highly affected by collisions and erosion. In the asteroid belt, direct evidence of the effects of large collisions can be seen in the existence of separate families of asteroids—a family consists of many asteroids with similar orbits and, frequently, similar surface properties, with each family being the remnant of a single catastrophic impact1. In the region beyond Neptune, in contrast, no collisionally created families have hitherto been found2. The third largest known Kuiper belt object, 2003 EL61, however, is thought to have experienced a giant impact that created its multiple satellite system, stripped away much of an overlying ice mantle, and left it with a rapid rotation3,4,5. Here we report the discovery of a family of Kuiper belt objects with surface properties and orbits that are nearly identical to those of 2003 EL61. This family appears to be fragments of the ejected ice mantle of 2003 EL61.

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Acknowledgements

We thank R. Sari, B. McKinnon, K. Noll, T. Ahrens and A. Morbidelli for their suggestions and comments on this work. This research is supported by a grant to M.E.B. from NASA Planetary Astronomy. Author Contributions M.E.B. was lead author of this Letter, and K.M.B., D.R. and E.L.S. contributed equally.

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Authors and Affiliations

  1. Division of Geological and Planetary Sciences, California Institute of Technology, Mail Code 150-21, 1200 E. California Blvd, Pasadena, California 91125, USA,
    Michael E. Brown, Kristina M. Barkume, Darin Ragozzine & Emily L. Schaller

Authors

  1. Michael E. Brown
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  2. Kristina M. Barkume
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  3. Darin Ragozzine
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  4. Emily L. Schaller
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Correspondence toMichael E. Brown.

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Reprints and permissions information is available at www.nature.com/reprints. The authors declare no competing financial interests.

Supplementary information

Supplementary Information

This file contains Supplementary Discussion, Supplementary Figures 1-2 with Legends, Supplementary Table 1 and additional references. The parts of Supplementary Information discuss all of the infrared spectra and colours the orbital dynamics of the family. (PDF 1211 kb)

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Brown, M., Barkume, K., Ragozzine, D. et al. A collisional family of icy objects in the Kuiper belt.Nature 446, 294–296 (2007). https://doi.org/10.1038/nature05619

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Editorial Summary

Meet the family

In the asteroid belt there are many separate families of asteroids, each consisting of many asteroids with similar orbits that are remnants of a single catastrophic impact. No collisionally created families had been detected in the distant Solar System beyond Neptune. But now Brown et al. describe a family of Kuiper belt objects (KBOs) with surface properties and orbits nearly identical to those of 2003 EL61, which is the third-largest known KBO, large enough to have two moons. The collisional history of the family members should provide invaluable data on the consequences of giant impacts in the Solar System.

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