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We present a study of the behavior of Saturn’s A ring outer edge, using images and occultation data obtained by the Cassini spacecraft over a period of 8years from 2006 to 2014. More than 5000 images and 170 occultations of the A ring outer edge are analyzed. Our fits confirm the expected response to the Janus 7:6 Inner Lindblad resonance (ILR) between 2006 and 2010, when Janus was on the inner leg...
•We report the discovery of a sub-km object orbiting near the edge of Saturn’s A ring.•The object’s perturbing effect on the rings has been detectable since May 2012.•There is evidence of a changing orbit and possible disruption in early 2013.•The object could have formed in situ due to the Janus resonance near the ring edge.
Small (∼50km scale), irregular features seen in Cassini images to be emanating from Saturn’s F ring have been termed mini-jets by Attree et al. (2012). One particular mini-jet was tracked over half an orbital period, revealing its evolution with time and suggesting a collision with a local moonlet as its origin. In addition to these data we present here a much more detailed analysis of the full catalogue...
An analytical model that describes the evolution of ring particles that are co-orbital with two larger bodies on near-circular and near-planar orbits has been formulated. This can be used to estimate the lifetime of the particles within the ring. All the examples investigated, such as the Janus–Epimetheus (JE) system, indicate that the particles should be removed from the co-orbital region within...
The planetary disturbing function is the basis of much analytical work in Solar System dynamics and series expansions of it that were derived in the last century are still in common use today. However, most previous expansions have the disadvantage of being in terms of the mutual inclination of the two masses. Also, several of the classical, high-order expansions contain a number of errors. A new...
Several high-resolution Voyager 2 images of Saturn's F ring show that it is composed of at least four separate, non-intersecting strands extending ∼45° in longitude. Voyager 1 images show that the two brightest strands appear to intersect, giving rise to a “braided” morphology. From a study of all available Voyager images the detectable radial structure is cataloged and reviewed. Previous indications...
There is substantial evidence for the existence of small satellites in the saturnian system in addition to those with well-determined orbits derived from ground-based and Voyager observations. Charged particle data from Pioneer 11 and Voyager 2 provide specific evidence for the existence of material coorbital with Mimas. This work is an attempt to identify small satellites coorbital with Mimas which...
We investigate the plausibility of detecting meteors from the surface of Mars. We estimate the flux of high-speed photographic meteoroids at the orbit of Mars to be ∼50% that at Earth. Because the atmospheric densities of the Earth and Mars are comparable at a height of 120 km, close to where meteor ablation occurs on Earth, we also expect martian meteors to ablate at heights similar to those on Earth...
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