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Дата изменения: Tue May 18 17:48:07 2004
Дата индексирования: Tue Oct 2 05:02:24 2012
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Reduction of Mutual Event Data

The process of reducing observations from both Armagh Observatory and Nyrölä Observatory, Jyväskylä, Finland, as part of a worldwide campaign to record mutual eclipses and occultations of the four Galilean satellites of Jupiter in 2002-2003 was started. 14 lightcurves were obtained from data obtained at Nyrölä Observatory, using a modification of an IDL script provided by Amir Ahmad as a prelude to reducing the Armagh data itself. The latter dataset consists of observations of approximately 17 discrete events, each covered by $\sim$1000 frames on average together with calibration frames. The first Armagh lightcurves, taken at 15, 18 and 25 March 2003, were generated at the end of the year. One of these events coincided with an event observed also at Nyrölä Observatory, which provided an opportunity to establish the quality of the Armagh data in terms of noise, systematic errors and so on. The results are shown in Figure 4, which demonstrates the fidelity of the Armagh data, the feasibility of observing phenomena of this type from the Armagh site, and the potential increase in data quality given a larger aperture and suitable upgrades in instrumentation. Reduction of these data will be completed in 2004, when the final dataset will be sent to the central mutual event data repository at the Institut de Mécanique Céleste et de Calcul des Éphémérides (IMCCE), the former Bureau des Longitudes in Paris, as has already been done for the Nyrölä Observatory data.