Stability of Jovian Irregular Satellites Between Callisto and Themisto

Details Stability of Jovian Irregular Satellites Between Callisto and Themisto Stability of Jovian Irregular Satellites Between Callisto and Themisto

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6409h&link_type=abstract

American Astronomical Society, DPS meeting #38, #64.09; Bulletin of the American Astronomical Society, Vol. 38, p.613

Astronomy and Astrophysics

Astronomy

Scientific paper

Mauna Kea survey observations of Jovian irregular satellites indicate that the region between Callisto (the outermost regular satellite at semimajor axis of 26 Jupiter-radii) and Themisto (the innermost Jovian irregular at approximately 100 Jupiter-radii), is devoid of small objects. An explanation for this observation may lie in the dynamical nature of small bodies in this region. That is, these objects may be intrinsically unstable. To examine this scenario, we launched an extensive numerical study of the orbital stability of small bodies in the region between 30 to 80 Jupiter-radii. We simulated the dynamics of a large battery of small objects and mapped their parameter-space for different values of their semimajor axes, eccentricities, and orbital inclinations. Results indicate that this region is indeed intrinsically unstable. However, the lifetimes of objects vary with their orbital eccentricities and inclinations. We present the results of our simulations and discuss their applicability to the origin of Jovian irregular satellites.
This research has been supported by NASA Astrobioilogy Institute under Cooperative Agreement NNA04CC08A.

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