Mutual events of the uranian satellites 2006–2010

• Published in: Icarus (New York, N.Y. 1962) Vol. 178; no. 1; pp. 171 - 178
• Main Author: Christou, Apostolos A.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.11.2005; Elsevier
• Subjects: Astronomy; Earth, ocean, space; Eclipses; Exact sciences and technology; Occultations; Orbits; Satellite; Satellites of Uranus; Solar system; Surfaces; Occultations; Surfaces; Satellites of Uranus; Eclipses; Photometric observation; Uncertainty; Light curves; Orbits; Sun; Albedo; Uranus planet; Uranus satellite; Satellites of Uranus. Orbits; Surfaces; Mapping manifolds; Ephemerides; Solar system; Satellite; Eclipses; Occultations
• ISSN: 0019-1035; 1090-2643
• DOI: 10.1016/j.icarus.2005.04.021

The upcoming crossing of the Sun and the Earth through the equatorial plane of the planet Uranus presents an opportunity to observe mutual eclipses and occultations of the uranian satellites. We present predictions for 321 such events from 2006 to 2010. 230 of these events are “nominal” i.e. they are predicted to occur based on the currently available ephemeris while a further 91 “grazing” events are allowable given the positional uncertainties of the satellites. Taking into account the statistical frequency of events that occur too close to the planet, during solar conjunction or are too “shallow” to observe, we conclude that about 150 events should be detectable from different longitudes around the world. We argue that a worldwide campaign of photometric observations of these events will yield, as in the case of the jovian and saturnian systems, high-precision astrometric information on the satellites toward improving their ephemerides as well as the system constants (satellite masses, uranian zonal harmonics, etc.). In addition, mathematical inversion of the lightcurves should permit, subject to the photometric quality and number of observed events, mapping of albedo variegations over the satellite hemispheres that were in darkness during the Voyager 2 encounter with the uranian system in 1985/1986.