Aims. From April 2008 to August 2011 Mars Express carried out 74 Phobos flybys at distances between 669 and 5579 km. Images
taken with the Super Resolution Channel (SRC) were used to determine the spacecraft-centered right ascension and declination of
this Martian moon.
Methods. Image positions of Phobos were measured using the limb-fit and control-point measurement techniques. Camera pointing
and pointing drift were controlled by means of background star observations that were compared to corresponding positions from
reference catalogs. Blurred and noisy images were restored by applying an image-based point spread function in a Richardson-Lucy
deconvolution.
Results. Here, we report on a set of 158 Phobos astrometric observations with estimated accuracies between 0.224 and 3.405 km
circular w.r.t. the line of sight to the satellite. Control point measurements yield slightly more accurate results than the limb fit ones.
Our observations are in good agreement with the current Phobos ephemerides by the Jet Propulsion Laboratory (JPL) and the Royal
Observatory of Belgium (ROB) with mean offsets of up to 335 m. Our data can be used for the maintenance and update of these
models
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