Kevin R. Grazier

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Titan, the largest moon of Saturn, is the only satellite in the Solar System with a substantial atmosphere. The atmosphere is poorly understood and obscures the surface, leading to intense speculation about Titan's nature. Here we present observations of Titan from the imaging science experiment onboard the Cassini spacecraft that address some of these(More)
The Cassini Imaging Science Subsystem acquired high-resolution imaging data on the outer Saturnian moon, Phoebe, during Cassini's close flyby on 11 June 2004 and on Iapetus during a flyby on 31 December 2004. Phoebe has a heavily cratered and ancient surface, shows evidence of ice near the surface, has distinct layering of different materials, and has a(More)
Images acquired of Saturn's rings and small moons by the Cassini Imaging Science Subsystem (ISS) during the first 9 months of Cassini operations at Saturn have produced many new findings. These include new saturnian moons; refined orbits of new and previously known moons; narrow diffuse rings in the F-ring region and embedded in gaps within the main rings;(More)
The Cassini Imaging Science Subsystem (ISS) began observing Saturn in early February 2004. From analysis of cloud motions through early October 2004, we report vertical wind shear in Saturn's equatorial jet and a maximum wind speed of approximately 375 meters per second, a value that differs from both Hubble Space Telescope and Voyager values. We also(More)
Outline • Accuracy of simulations critical to understanding of solar system dynamics and influence on climate • Numerical integration and symplectic maps • Evidence that the outer solar system may not be chaotic • Application to dynamics of outer solar system Introduction • Approximate methods for the integration of ordinary differential equations in time t(More)
We repo~t on numerical simulations exploring the dynamical stability of planetesirnals in the gaps between the outer solar system planets. We reconsider the existence of st able niches in the Sat-urn/ [Jranus and Uranus/Neptune zones by employing 10,000 massless particles-many more than l)revious studies in these two zones-using high-order optimized(More)
Explicit Runge–Kutta Nyström pairs provide an efficient way to find numerical solutions to second-order initial value problems when the derivative is cheap to evaluate. We present new optimal pairs of orders ten and twelve from existing families of pairs that are intended for accurate integrations in double precision arithmetic. We also present a summary of(More)
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