Astrometric motion of DE0823−49 and its photocentric orbit, updated from Sahlmann et al. (2013). Panel a) shows proper and parallactic motion relative to the field of reference stars. Panel b) is a close-up of the photocentric orbit caused by the gravitational pull of the orbiting brown dwarf. Observations with uncertainties and the best-fit model are shown as black circles and grey curve, respectively.