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We report on results of astrometric observations of water vapor masers in the"water fountain" source IRAS 18286-0959 (I18286) with the VLBI Exploration ofRadio Astrometry (VERA). These observations yielded an annual parallax of IRAS18286-0959, pi=0.277+/-0.041 mas, corresponding to a heliocentric distance ofD=3.61(+0.63)(-0.47) kpc. The maser feature, whose annual parallax wasmeasured, showed the absolute proper motion of (mu_alpha, mu_delta)=(-3.2 +/-0.3, -7.2 +/- 0.2) [mas/yr]. The intrinsic motion of the maser feature in theinternal motions of the cluster of features in I18286 does not seem to tracethe motion of the bipolar jet of I18286. Taking into account this intrinsicmotion, the derived motion of the maser feature is roughly equal to that of themaser source I18286 itself. The proximity of I18286 to the Galactic midplane(z~10 pc) suggests that the parental star of the water fountain source inI18286 should be intermediate-mass AGB/post-AGB star, but the origin of a largedeviation of the systemic source motion from that expected from the Galacticrotation curve is still unclear.

Annual Parallax Distance and Secular Motion of the Water Fountain Source IRAS 18286-0959