Several families of irregular moons orbit the giant planets. These moons are thought to have been captured into planetocentric orbits after straying into a region in which the planet’s gravitation dominates solar perturbations (the Hill sphere). This mechanism requires a source of dissipation, such as gas-drag, in order to make capture permanent. However, capture by gas-drag requires that parti...

The two small asteroid-like bodies orbiting Mars, Phobos and Deimos, are low albedo and exhibit similar visible to near-infrared spectra. Determining the origin of these moons is closely tied to determining their composition. From available spectroscopic data Phobos exhibits two distinct types of materials across its surface, and data from both Mars Express and Mars Reconnaissance Orbiter have ...

one of the subjects that researchers are agreed on is hafez acquaintance to music and sing. extensive studies have been conducted on musical terms in hafez works; there are some words in his poems that are surrounded by a musical halo, however theirlexical meanings are still considered through the context of the poems, but nobody can get a profound understanding out of hafez’s artistic elegance...

Context. The effects of space weathering and other alteration processes on the upper surface Saturn’s icy moons are yet to be explored. Aims. We present a thermophysical model parametrised by way regolith properties such as porosity, grain size, composition, well local topography. modelled temperature apparent emissivity intended compared measurements taken Cassini’s Composite Infrared Spectrom...

ABSTRACT The so-called ‘exomoon corridor’ is a potentially powerful new tool for identifying possible exomoon hosts, enabled by the observation that fully half of all planets hosting an will exhibit transit timing variation (TTV) periodicities 2–4 epochs. One key outstanding problem in search exomoons, however, question how well methods we have developed under single moon assumption extend to s...

I investigate the hypothesis that small, unseen moons are “shepherding” the main rings of Uranus. The ring edges are expected to be confined at the discrete locations of Lindblad resonances, where the moon’s influence produces a wavy edge. For a narrow, optically thick ring, this interaction manifests itself as a periodic variation in the ring’s brightness. Under many circumstances, the induced...