Planetary rings, by Larry W. Esposito
نویسندگان
چکیده
منابع مشابه
Structuring eccentric-narrow planetary rings
A simple and general description of the dynamics of a narrow-eccentric ring is presented. We view an eccentric ring which precesses uniformly at a slow rate as exhibiting a global m = 1 mode, which can be seen as originating from a standing wave superposed on an axisymmetric background. We adopt a continuum description using the language of fluid dynamics which gives equivalent results for the ...
متن کاملMarco Esposito
Purpose: To evaluate whether 4.0 x 4.0 mm dental implants could be an alternative to implants at least 8.5 mm long, which were placed in posterior jaws in the presence of adequate bone volumes. Materials and methods: One hundred and fifty patients with posterior (premolar and molar areas) mandibles having at least 12.5 mm bone height above the mandibular canal or 11.5 mm bone height below the m...
متن کاملApse Alignment of Narrow Eccentric Planetary Rings
The boundaries of the Uranian ǫ, α, and β rings can be fitted by Keplerian ellipses. The pair of ellipses that outline a given ring share a common line of apsides. Apse alignment is surprising because the quadrupole moment of Uranus induces differential precession. We propose that rigid precession is maintained by a balance of forces due to ring self-gravity, planetary oblateness, and interpart...
متن کاملThree-Dimensional Dynamics of Narrow Planetary Rings
Narrow planetary rings are eccentric and inclined. Particles within a given ring must therefore share the same pericenter and node. We solve for the threedimensional geometries and mass distributions that enable the Uranian α and β rings, and the Saturnian Maxwell and Colombo (Titan) rings, to maintain simultaneous apsidal and nodal lock. Ring self-gravity, interparticle collisions, and the qua...
متن کاملSimulation of collisions in planetary rings
We investigate the evolution of structures in planetary rings in the neighbourhood of the orbit of an embedded moonlet (small satellite). The effects of collisions have been taken into account by introducing the velocity dependent restitution coefficient according to experimental and theoretical results. Here we present results of recent many-particle simulations which show a significant influe...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 2007
ISSN: 1086-9379,1945-5100
DOI: 10.1111/j.1945-5100.2007.tb00233.x