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

M. J S Belton, C. R. Chapmant, P. C. Thomas, M. E. Davies, Richard J. Greenberg, K. Klaasen, D. Byrnes, L. D'Amario, S. Synnott, T. V. Johnson, Alfred S. McEwen, W. J. Merline, D. R. Davis, J. M. Petit, A. Storrs, J. Veverka, B. Zellner

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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 chondritic 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.

Original languageEnglish (US)
JournalNature
Volume374
Issue number6525
StatePublished - Apr 27 1995

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Ida asteroid
natural satellites
Galileo spacecraft
orbits
reconnaissance
igneous rocks
asteroids
porosity

ASJC Scopus subject areas

  • General

Cite this

Belton, M. J. S., Chapmant, C. R., Thomas, P. C., Davies, M. E., Greenberg, R. J., Klaasen, K., ... Zellner, B. (1995). Bulk density of asteroid 243 Ida from the orbit of its satellite Dactyl. Nature, 374(6525).

Bulk density of asteroid 243 Ida from the orbit of its satellite Dactyl. / Belton, M. J S; Chapmant, C. R.; Thomas, P. C.; Davies, M. E.; Greenberg, Richard J.; Klaasen, K.; Byrnes, D.; D'Amario, L.; Synnott, S.; Johnson, T. V.; McEwen, Alfred S.; Merline, W. J.; Davis, D. R.; Petit, J. M.; Storrs, A.; Veverka, J.; Zellner, B.

In: Nature, Vol. 374, No. 6525, 27.04.1995.

Research output: Contribution to journalArticle

Belton, MJS, Chapmant, CR, Thomas, PC, Davies, ME, Greenberg, RJ, Klaasen, K, Byrnes, D, D'Amario, L, Synnott, S, Johnson, TV, McEwen, AS, Merline, WJ, Davis, DR, Petit, JM, Storrs, A, Veverka, J & Zellner, B 1995, 'Bulk density of asteroid 243 Ida from the orbit of its satellite Dactyl', Nature, vol. 374, no. 6525.
Belton MJS, Chapmant CR, Thomas PC, Davies ME, Greenberg RJ, Klaasen K et al. Bulk density of asteroid 243 Ida from the orbit of its satellite Dactyl. Nature. 1995 Apr 27;374(6525).
Belton, M. J S ; Chapmant, C. R. ; Thomas, P. C. ; Davies, M. E. ; Greenberg, Richard J. ; Klaasen, K. ; Byrnes, D. ; D'Amario, L. ; Synnott, S. ; Johnson, T. V. ; McEwen, Alfred S. ; Merline, W. J. ; Davis, D. R. ; Petit, J. M. ; Storrs, A. ; Veverka, J. ; Zellner, B. / Bulk density of asteroid 243 Ida from the orbit of its satellite Dactyl. In: Nature. 1995 ; Vol. 374, No. 6525.
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AU - Klaasen, K.

AU - Byrnes, D.

AU - D'Amario, L.

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AU - Johnson, T. V.

AU - McEwen, Alfred S.

AU - Merline, W. J.

AU - Davis, D. R.

AU - Petit, J. M.

AU - Storrs, A.

AU - Veverka, J.

AU - Zellner, B.

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