Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005astl...31..205z&link_type=abstract
Astronomy Letters, vol. 31, Issue 3, p.205-212
Astronomy and Astrophysics
Astronomy
2
Galilean Satellite Io - Models - Chandlerian Periods
Scientific paper
We consider two-layer (Fe-FeS core+silicate mantle) and three-layer (Fe-FeS core+silicate mantle+crust) models of the Galilean satellite Io. Two parameters are known from observations for the equilibrium figure of the satellite, the mean density ρ 0 and the Love number k 2. Previously, the Radau-Darwin formula was used to determine the mean moment of inertia. Using formulas of the Figure Theory, we calculated the principal moments of inertia A, B, and C and the mean moment of inertia I for the two-and three-layer models of Io using ρ 0 and k 2 as the boundary conditions. We concluded that when modeling the internal structure of Io, it is better to use the observed value of k 2 than the moment of inertia I derived from k 2 using the Radau-Darwin formula. For the models under consideration, we calculated the Chandlerian wobble periods of Io. For the three-layer model, this period is approximately 460 days.
Sobisevich A. L.
Zharkov Vladimir Naumovich
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