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We report the results of VERA multi-epoch VLBI 22 GHz water maserobservations of S255IR-SMA1, a massive young stellar object located in the S255star forming region. By annual parallax the source distance was measured as D =1.78 +-0.12 kpc and the source systemic motion was (u alpha cos d, u d) =(-0.13 +- 0.20, -0.06 +- 0.27) mas yr-1. Masers appear to trace a U-shaped bowshock whose morphology and proper motions are well reproduced by a jet-drivenoutflow model with a jet radius of about 6 AU. The maser data, in the contextof other works in the literature, reveal ejections from S255IR-SMA1 to beepisodic, operating on timescales of ~1000 years.

H2O masers in a jet-driven bowshock: Episodic ejection from a massive young stellar object