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Astrometric Reduction of Saturnian Satellites with Cassini-ISS Images Degraded by Trailed Stars
Li, Yan; Zhang, Qing-Feng; Liu, Meng-Qi +4 more
The Imaging Science Subsystem (ISS) mounted on the Cassini spacecraft has taken a lot of images, which provides an important source of high-precision astrometry of some planets and satellites. However, some of these images are degraded by trailed stars. Previously, these degraded images cannot be used for astrometry. In this paper, a new method is…
Saturn’s gravitational field induced by its equatorially antisymmetric zonal winds
Anderson, John D.; Schubert, Gerald; Kong, Dali +1 more
The cloud-level zonal winds of Saturn are marked by a substantial equatorially antisymmetric component with a speed of about 50ms-1 which, if they are sufficiently deep, can produce measurable odd zonal gravitational coefficients ΔJ 2k+1, k = 1, 2, 3, 4. This study, based on solutions of the thermal-gravitational wind equatio…