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During the 2018 Mars opposition a global dust storm developed in the period from May to July and declined again in September. Interestingly, when the storm vanished an accumulation of dust could be detected at several locations, including the Valles Marineris region. In order to correlate local topographic features with the distribution of dust we have investigated the nature of the Valles Marineris terrain using ArcGIS software and detailed elevation data. Spatial analysis using ArcGIS seems to be a useful tool to obtain more insight into dynamic features on Mars and other planets.

Prof Jean Dragesco (b. 1920) gained a worldwide reputation as a photographer of the microscopic scale to the macroscopic. Protistologist by profession and amateur astronomer by inclination, his solar, lunar, planetary and cometary photographs have been admired by a generation of BAA members. This short paper celebrates the centenary of his birth.