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The First PHEMU Campaign in 1908
JOA 2022, Vol. 12, No. 2, Page 9 Author(s): Konrad GuhlAbstract: The observation of mutual phenomena of Jovian satellites in the PHEMU campaigns have been known since 1973. Research on such observations in the pre-internet era showed that, after random observations in the 19th century, the first international campaign on such events took place as early as 1908. The predictions published by Oudemans in 1906 were the basis for 11 observers from several countries to observe systematically. In the paper 17 observed events are compared with the modern simulation. The mean value of the O-C value of the visual observations of the campaign is -0.15 minutes.