Three-dimensional orbit of PG 1610+062 in a Galactic Cartesian coordinate system in which the z-axis points to the Galactic north pole. The nine trajectories (red lines; arrows indicate the star’s current position) are computed in Model I of Irrgang et al. (2013) and illustrate the effects of uncertainties in the distance, proper motions, and radial velocity. Orbits were computed back in time until they reached the Galactic plane. The small black rimmed, shaded areas are 1σ (red) and 2σ (light blue) contours for the intersection of the Galactic plane. The thick blue solid lines schematically represent the loci of the spiral arms 41 Myr ago based on the polynomial logarithmic arm model of Hou & Han (2014) and the Galactic rotation curve of Model I of Irrgang et al. (2013). The current positions of the Sun and the GC are marked by a yellow circled dot (⊙) and a black plus sign (+), respectively. The orbit is characteristic of a disk runaway star.