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A low density of 0.8 g cm-3 for the Trojan binary asteroid 617 Patroclus

Author

Listed:
  • Franck Marchis

    (University of California)

  • Daniel Hestroffer

    (UMR CNRS 8028, Observatoire de Paris)

  • Pascal Descamps

    (UMR CNRS 8028, Observatoire de Paris)

  • Jérôme Berthier

    (UMR CNRS 8028, Observatoire de Paris)

  • Antonin H. Bouchez

    (W. M. Keck Observatory)

  • Randall D. Campbell

    (W. M. Keck Observatory)

  • Jason C. Y. Chin

    (W. M. Keck Observatory)

  • Marcos A. van Dam

    (W. M. Keck Observatory)

  • Scott K. Hartman

    (W. M. Keck Observatory)

  • Erik M. Johansson

    (W. M. Keck Observatory)

  • Robert E. Lafon

    (W. M. Keck Observatory)

  • David Le Mignant

    (W. M. Keck Observatory)

  • Imke de Pater

    (University of California)

  • Paul J. Stomski

    (W. M. Keck Observatory)

  • Doug M. Summers

    (W. M. Keck Observatory)

  • Frédéric Vachier

    (UMR CNRS 8028, Observatoire de Paris)

  • Peter L. Wizinovich

    (W. M. Keck Observatory)

  • Michael H. Wong

    (University of California)

Abstract

The Trojan population consists of two swarms of asteroids following the same orbit as Jupiter and located at the L4 and L5 stable Lagrange points of the Jupiter–Sun system (leading and following Jupiter by 60°). The asteroid 617 Patroclus is the only known binary Trojan1. The orbit of this double system was hitherto unknown. Here we report that the components, separated by 680 km, move around the system's centre of mass, describing a roughly circular orbit. Using this orbital information, combined with thermal measurements to estimate the size of the components, we derive a very low density of . The components of 617 Patroclus are therefore very porous or composed mostly of water ice, suggesting that they could have been formed in the outer part of the Solar System2.

Suggested Citation

  • Franck Marchis & Daniel Hestroffer & Pascal Descamps & Jérôme Berthier & Antonin H. Bouchez & Randall D. Campbell & Jason C. Y. Chin & Marcos A. van Dam & Scott K. Hartman & Erik M. Johansson & Robert, 2006. "A low density of 0.8 g cm-3 for the Trojan binary asteroid 617 Patroclus," Nature, Nature, vol. 439(7076), pages 565-567, February.
    • Handle: RePEc:nat:nature:v:439:y:2006:i:7076:d:10.1038_nature04350
    DOI: 10.1038/nature04350
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