Saturn's F Ring: Kinematics and Particle Sizes from Stellar Occultation Studies

Bosh, A. S.; Olkin, C. B.; French, R. G.; Nicholson, P. D.

doi:10.1006/icar.2002.6791

Cited by 62 publications

(88 citation statements)

References 45 publications

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“…The nodal rates are highly uncertain, but if they precess at different rates than the node of the F ring, then both orbits must periodically intersect the F-ring core. 6 As seen in Figure 21, S6's orbit came within about 1.5 km of the F-ring core, less than its estimated vertical thickness (Bosh et al 2002), in 2005 April. It would be surprising if such an interaction resulted in no observable consequences; indeed, Charnoz et al (2005) suggest that a newly discovered spiral structure observed in the tenuous material surrounding the F ring may be among those consequences.…”

Section: F-ring Objectsmentioning

confidence: 95%

The Orbits of Saturn's Small Satellites Derived from Combined Historic andCassiniImaging Observations

Spitale

Jacobson

Porco

et al. 2006

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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 those cases in which simple precessing elliptical, inclined orbit solutions were found to be inadequate. Using combined Cassini and Voyager observations, we obtain an eccentricity for Pan 7 times smaller than previously reported because of the predominance of higher quality Cassini data in the fit. The orbit of the small satellite (S/2005 S1 [Daphnis]) discovered by Cassini in the Keeler gap in the outer A ring appears to be circular and coplanar; no external perturbations are apparent. Refined orbits of Atlas, Prometheus, Pandora, Janus, and Epimetheus are based on Cassini , Voyager, Hubble Space Telescope, and Earth-based data and a numerical integration perturbed by all the massive satellites and each other. Atlas is significantly perturbed by Prometheus, and to a lesser extent by Pandora, through high-wavenumber mean-motion resonances. Orbital integrations involving Atlas yield a mass of GM Atlas ¼ (0:44 AE 0:04) ; 10 À3 km 3 s À2, 3 times larger than reported previously (GM is the product of the Newtonian constant of gravitation G and the satellite mass M ). Orbital integrations show that Methone is perturbed by Mimas, Pallene is perturbed by Enceladus, and Polydeuces librates around Dione's L5 point with a period of about 791 days. We report on the nature and orbits of bodies sighted in the F ring, two of which may have persisted for a year or more.

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Section: F-ring Objectsmentioning

confidence: 95%

The Orbits of Saturn's Small Satellites Derived from Combined Historic andCassiniImaging Observations

Spitale

Jacobson

Porco

et al. 2006

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“…Other effects, such as radiative forces or plasma drag, may in principle affect the particles' orbits. Whereas the core of the F ring seems to be made of big and small particles (4,11), the surrounding region seems populated by micrometer-sized particles (12,20) that will be sensitive to radiation effects (10). For the moment, no dynamical model of the F ring including radiative effects has been published.…”

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confidence: 99%

“…A wide range of nanoscale electronic and photonic devices have been made with carbon nanotube and nanowire functional elements (1)(2)(3)(4). Although the nanomaterials are important for achieving observed functional properties in these nanodevices, many of the most critical features have been defined with the use of similar lithographic approaches that drive and ultimately limit the planar semiconductor industry.…”

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confidence: 99%

“…1A), because even a few atomic layers of dopant deposited on the surface of a nanowire can dominate its overall electronic properties (11). In the metal nanocluster-catalyzed vaporliquid-solid growth process (3)(4)(5), which has been widely used to prepare nanowires, the dopant must be added exclusively at the nanocluster catalyst without reaction and deposition at the much larger area of the exposed solid REPORTS…”

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confidence: 99%

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Cassini Discovers a Kinematic Spiral Ring Around Saturn

Charnoz

Porco

Déau

et al. 2005

Science

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Since the time of the Voyager flybys of Saturn in 1980–1981, Saturn's eccentric F ring has been known to be accompanied on either side by faint strands of material. New Cassini observations show that these strands, initially interpreted as concentric ring segments, are in fact connected and form a single one-arm trailing spiral winding at least three times around Saturn. The spiral rotates around Saturn with the orbital motion of its constituent particles. This structure is likely the result of differential orbital motion stretching an initial cloud of particles scattered from the dense core of the F ring. Different scenarios of formation, implying ringlet-satellite interactions, are explored. A recently discovered moon candidate, S/2004 S6, is on an orbit that crosses the F-ring core at the intersection of the spiral with the ring, which suggests a dynamical connection between S/2004 S6 and the spiral.

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“…Prometheus can even penetrate the ring, making an approach that uses a series expansion for large impact parameter impossible. The parameters of the F-ring core (a F−ring = 140224 km,ẽ F−ring = 0.0025, Bosh et al (2002)) and the Prometheus (a Pro = 139380 km,ẽ Pro = 0.0022, m Pro = 1.6 · 10 17 kg, Jacobson et al (2008)) suggest a periodic variation of the scaled effective eccentricity between 0.7 and 10. Our analytical model can be used as long as the scaled effective eccentricity is below 5, which can be estimated by equation (50) using the mean distance between ring core and moon.…”

Section: Summary and Discussionmentioning

confidence: 99%

Moonlet induced wakes in planetary rings: Analytical model including eccentric orbits of moon and ring particles

Seiß

Spahn

Schmidt

2010

Icarus

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Saturn's rings host two known moons, Pan and Daphnis, which are massive enough to clear circumferential gaps in the ring around their orbits. Both moons create wake patterns at the gap edges by gravitational deflection of the ring material (Cuzzi and Scargle (1985), Showalter et al. (1986)). New Cassini observations revealed that these wavy edges deviate from the sinusoidal waveform, which one would expect from a theory that assumes a circular orbit of the perturbing moon and neglects particle interactions. (2005)), which might be attributed to the neglect of particle interactions and vertical motion in our model.

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Saturn's F Ring: Kinematics and Particle Sizes from Stellar Occultation Studies

Cited by 62 publications

References 45 publications

The Orbits of Saturn's Small Satellites Derived from Combined Historic andCassiniImaging Observations

The Orbits of Saturn's Small Satellites Derived from Combined Historic andCassiniImaging Observations

Cassini Discovers a Kinematic Spiral Ring Around Saturn

Moonlet induced wakes in planetary rings: Analytical model including eccentric orbits of moon and ring particles

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