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The Gravity Field of the Saturnian System from Satellite Observations and Spacecraft Tracking Data
Jacobson, R. A.; Owen, W. M., Jr.; Mackenzie, R. A. +11 more
We present values for the masses of Saturn and its major satellites, the zonal harmonics in the spherical harmonic expansion of Saturn's gravitational potential, and the orientation of the pole of Saturn. We determined these values using an extensive data set: satellite astrometry from Earth-based observatories and the Hubble Space Telescope; Eart…
The Orbits of Saturn's Small Satellites Derived from Combined Historic and Cassini Imaging Observations
Porco, C. C.; Spitale, J. N.; Jacobson, R. A. +1 more
We report on the orbits of the small, inner Saturnian satellites, either recovered or newly discovered in recent Cassini imaging observations. The orbits presented here reflect improvements over our previously published values in that the time base of Cassini observations has been extended, and numerical orbital integrations have been performed in…
The GM Values of Mimas and Tethys and the Libration of Methone
Porco, C. C.; Jacobson, R. A.; Spitale, J. +1 more
We have determined the GM of the Saturnian satellite Mimas from an analysis of its resonance with Tethys and with the newly discovered satellite Methone (GM is the product of the Newtonian constant of gravitation G and the satellite's mass M). Observations of the latter permit a factor of 5 improvement in our knowledge of Mimas's GM; its value is …