By Brian May
The Zodiacal gentle, that misty diffuse cone of sunshine visible within the West after sundown and the East sooner than dawn, is a gorgeous and fascinating phenomenon. although every person can benefit from the sight from a definitely darkish position, it really is poorly understood, and has been the topic of rather little examine. Brian might begun his examine into the topic in 1970, and was once eventually provided his PhD in 2007, after a hiatus of greater than 30 years pursuing his different occupation as guitarist together with his rock band Queen. This e-book is Brian’s thesis, and as such provides the result of his learn for astronomers.
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Extra resources for A Survey of Radial Velocities in the Zodiacal Dust Cloud
The outer bands were later identified as being associated with the Eos family of asteroids, which also reside at about 3 AU, but whose orbits are presumably more scattered in their inclinations to the ecliptic. In addition it was noted that there could be a component of interstellar dust, forming a disc located at 50 AU, in the ‘inner’ Oort Cloud, beyond the orbit of Pluto, which is thought to be the origin of short period comets. Jones and Rowan-Robinson (1993), noting that the previous model did not make good predictions at low ecliptic latitudes, and also did not account for the IRAS Dust Bands, modified the ‘Fan’ empirical model at low values of z , where z is the perpendicular distance of the dust particle from the plane of symmetry, and thus sin β0 = z .
Their results lent support to the model: n( r ) ∝ 1 r …. e. 1 with α =1. The reason why the Gegenschein is there at all was certainly not clear prior to 1970, and may still be € in question. € If it is not due to a GDC, or to Lunar ejecta streaming outwards in the solar wind (Jeffries 1971), perhaps n(r ) in the circumsolar cloud increases outside the Earth’s orbit, or perhaps the effect is caused by a back-scattering peak in intensity which might be expected from ‘fluffy’ particles, and has been predicted from models using dielectric materials in general.
Based on the hypothesis that ‘old’ drag-degraded asteroidal Bands are at least significant contributors to the smooth cloud, the Fan € model was assumed to contain essentially no material beyond a distance of 3 AU from the Sun. The major source of perturbation to dust grain orbits was assumed to be the planets. 3 as used in analysing the Helios data. In this paper, the authors now modelled the density profiles of the bands themselves, using an analytical model for two families of asteroids, € Eos and Themis.