Predictions of the mutual events of the Uranian satellites occurring in 2006–2009

¹ Institut de mécanique céleste et de calcul des éphémérides - Observatoire de Paris, UMR 8028 CNRS, 77 avenue Denfert-Rochereau, 75014 Paris, France e-mail: Jean-Eudes.Arlot@imcce.fr
² Observatoire Royal de Belgique, Avenue Circulaire 3, 1180, Bruxelles, Belgium

Received: 7 March 2006
Accepted: 28 April 2006

Abstract

Context.Every 42 years, the Earth and the Sun pass through the equatorial plane of Uranus allowing observations of mutual occultations and eclipses of the main satellites of Uranus. The next opportunity will occur in 2006–2009.

Aims.Such events are uncommon and very rare, and they allow us to accurately determine the inclinations of the orbits of the satellites, which is usually difficult. However, in order to be able to observe, we need accurate predictions.

Methods.To find these predictions, we developed a new dynamical model based on the most recent astrometric observations of the satellites.

Results.This paper provides predictions of these events using two different models for the motion of the satellites, along with information useful for the observations. Data on the predictions of the events are available on the web server of the IMCCE at ftp.imcce.fr/pub/ephem/satel/pheura07.

Conclusions.We therefore encourage professional and amateur astronomers to join the network of observers to get as many observations as possible.