Observations and Analysis of Mutual Events between the Uranus Main Satellites

Every 42 years, the Earth and the Sun pass through the plane of the orbits of the main satellites of Uranus. In these occasions, mutual occultations and eclipses between these bodies can be seen from the Earth. The current Uranus equinox from 2007 to 2009 offers a precious opportunity to observe the...

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Bibliographic Details
Published in:The Astronomical journal 2009-04, Vol.137 (4), p.4046-4053
Main Authors: Assafin, M, Vieira-Martins, R, Braga-Ribas, F, Camargo, J. I. B, da Silva Neto, D. N, Andrei, A. H
Format: Article
Language:English
Subjects:
Astrophysics
Physics
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Summary:Every 42 years, the Earth and the Sun pass through the plane of the orbits of the main satellites of Uranus. In these occasions, mutual occultations and eclipses between these bodies can be seen from the Earth. The current Uranus equinox from 2007 to 2009 offers a precious opportunity to observe these events. Here, we present the analysis of five occultations and two eclipses observed from Brazil during 2007. For the reduction of the CCD images, we developed a digital coronagraphic method that removed the planet's scattered light around the satellites. A simple geometric model of the occultation/eclipse was used to fit the observed light curves. Dynamical quantities such as the impact parameter, the relative speed, and the central time of the event were then obtained with precisions of 7.6 km, 0.18 km s-1, and 2.9 s, respectively. These results can be further used to improve the parameters of the dynamical theories of the main Uranus satellites.
ISSN:1538-3881
0004-6256
1538-3881
DOI:10.1088/0004-6256/137/4/4046