Relative proper motions of H|$ _{2}$| O maser features in IRAS 18286|$-$| 0959. The origin of coordinates is set to the position-reference maser feature, which was selected from different features between the epochs in 2007-2008 (IRAS 18286|$-$| 0959:I2013-14) and those in 2009 (IRAS 18286|$-$| 0959:I2013-36). Colors of maser feature indicate LSR velocities. An arrow shows the relative proper motion of the maser feature. The root position of an arrow indicates the location of the maser feature at the first of the epochs when the feature was detected. The length and the direction of an arrow indicate the speed and direction of the maser proper motion, respectively. (a) Proper motions identified in 2007-2008. The annual parallax and secular motions of maser spots were measured for those in the position-reference feature at the map origin. The systemic motion (or the motion of star), which was estimated in the least-squares model fitting, is subtracted from the measured proper motions. A magenta plus symbol denotes the estimated location of the dynamical center of the modelled outflow. A magenta arrow indicates a proper motion (⁠|$-$| 51, |$-$| 85)[km s|$ ^{-1}$| ], corresponding to (⁠|$-$| 3, |$-$| 5)[mas yr|$ ^{-1}$| ]. If the relative motion of the position-reference feature has this motion vector with respect to the system, the systemic motion well follows a motion expected from the Galactic rotation curve. (b) Same as (a) but in 2009. A mean motion of (20, |$-$| 130) [km s|$ ^{-1}$| ] is subtracted from the individual measured motions.