Predicted position of Vanth relative to Orcus on 2010 Feb. 23.237, from the extrapolation of the initial 2004−2007 data by Brown et al. (2010). The two curves reprensent two possible solutions with symmetric pole solutions. The dots in the Eastern part of the frame correspond to the predicted positions at the time of the SINFONI observation for all retained orbital solutions given in Fig. 6.