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Imaging the Interaction of the Heliosphere with the Interstellar Medium from Saturn with Cassini

Hsieh, K. C.; Krimigis, S. M.; Mitchell, D. G. +2 more

We report an all-sky image of energetic neutral atoms (ENAs) >6 kilo-electron volts produced by energetic protons occupying the region (heliosheath) between the boundary of the extended solar atmosphere and the local interstellar medium (LISM). The map obtained by the Ion and Neutral Camera (INCA) onboard Cassini reveals a broad belt of energet…

Size and Shape of Saturn's Moon Titan

Kirk, Randolph L.; Hensley, Scott; Zebker, Howard A. +3 more

Cassini observations show that Saturn’s moon Titan is slightly oblate. A fourth-order spherical harmonic expansion yields north polar, south polar, and mean equatorial radii of 2574.32 ± 0.05 kilometers (km), 2574.36 ± 0.03 km, and 2574.91 ± 0.11 km, respectively; its mean radius is 2574.73 ± 0.09 km. Titan’s shape approximates a hydrostatic, sync…