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Bulk density of asteroid 243 Ida from the orbit of its satellite Dactyl

Nature volume 374, pages 785–788 (1995)Cite this article

Abstract

DURING its reconnaissance of the asteroid 243 Ida, the Galileo spacecraft returned images of a second object, 1993(243)1 Dactyl1— the first confirmed satellite of an asteroid. Sufficient data were obtained on the motion of Dactyl to determine its orbit as a function of Ida's mass. Here we apply statistical and dynamical arguments to constrain the range of possible orbits, and hence the mass of Ida. Combined with the volume of Ida2, this yields a bulk density of 2.6 ± 0.5 g cm−3. Allowing for the uncertainty in the porosity of Ida, this density range is consistent with a bulk chon-dritic composition, and argues against some (but not all) classes of meteoritic igneous rock types that have been suggested as compositionally representative of S-type asteroids like Ida.

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Authors and Affiliations

  1. National Optical Astronomy Observatories, Tucson, Arizona, 85719, USA

    M. J. S. Belton

  2. Planetary Science Institute/SAIC, Tucson, Arizona, 85705, USA

    C. R. Chapman, W. J. Merline & D. R. Davis

  3. Center for Radiophysics and Space Research, Cornell University, Ithaca, New York, 14853, USA

    P. C. Thomas & J. Veverka

  4. RAND, Santa Monica, California, 90406, USA

    M. E. Davies

  5. Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona, 87721, USA

    R. Greenberg & J.-M. Petit

  6. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, 91109, USA

    K. Klaasen, D. Byrnes, L. D'Amario, S. Synnott & T. V. Johnson

  7. United States Geological Survey, Flagstaff, Arizona, 86001, USA

    A. McEwen

  8. Space Telescope Science Institute, Baltimore, Maryland, 21218, USA

    A. Storrs

  9. Department of Physics, Georgia Southern University, Statesboro, Georgia, 30460, USA

    B. Zellner

Authors
  1. M. J. S. Belton
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  2. C. R. Chapman
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  3. P. C. Thomas
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  4. M. E. Davies
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  5. R. Greenberg
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  6. K. Klaasen
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  7. D. Byrnes
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  8. L. D'Amario
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  9. S. Synnott
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  10. T. V. Johnson
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  11. A. McEwen
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  12. W. J. Merline
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  13. D. R. Davis
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  14. J.-M. Petit
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  15. A. Storrs
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Belton, M., Chapman, C., Thomas, P. et al. Bulk density of asteroid 243 Ida from the orbit of its satellite Dactyl. Nature 374, 785–788 (1995). https://doi.org/10.1038/374785a0

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