Observations and Analysis of Mutual Events between the Uranus Main Satellites

Details Observations and Analysis of Mutual Events between the Uranus Main Satellites Observations and Analysis of Mutual Events between the Uranus Main Satellites

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aj....137.4046a&link_type=abstract

The Astronomical Journal, Volume 137, Issue 4, pp. 4046-4053 (2009).

Astronomy and Astrophysics

Astronomy

1

Eclipses, Methods: Data Analysis, Occultations, Planets And Satellites: Individual: Ariel Miranda Oberon Titania Umbriel, Techniques: Image Processing, Techniques: Photometric

Scientific paper

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.
Based on observations made at Laboratório Nacional de Astrofísica (LNA), Itajubá-MG, Brazil.

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