Displacements from the a priori lateral position of MEX as a function of time, measured using the imaging approach. Displacements in Right Ascension (mas) are shown in blue, in Declination (mas) in red. 2-min integration time; net time on target ~5.5h. December 28–29, 2013. The apparent jump in position near 01:00:00 UT is discussed in Sect. 3.
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