The Shape of Io from Galileo Limb Measurements

P. C. Thomas, M. E. Davies, T. R. Colvin, J. Oberst, P. Schuster, G. Neukum, M. H. Carr, A. McEwen, G. Schubert, M. J.S. Belton

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Galileo CCD images of the limb of Io provide improved data for determining the shape of this synchronously rotating satellite. The best ellipsoidal fit is within 0.3 km of the best equilibrium fit of 1829.7, 1819.2, 1815.8 km. The shape is consistent with substantial mass concentration in a core and with gravity measurements from tracking of the Galileo spacecraft. The surface of Io is largely plains and isolated peaks, with little long-wavelength topography over 1 km in amplitude.

Original languageEnglish (US)
Pages (from-to)175-180
Number of pages6
Issue number1
StatePublished - Sep 1998

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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