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We report on trigonometric parallax measurements for the Galactic starforming region G14.33-0.64 toward the Sagittarius spiral arm. We conductedmulti-epoch phase-referencing observations of an H2O maser source inG14.33-0.64 with the Japanese VLBI array VERA. We successfully detected aparallax of 0.893+/-0.101 mas, corresponding to a source distance of1.12+/-0.13 kpc, which is less than half of the kinematic distance forG14.33-0.64. Our new distance measurement demonstrates that the Sagittarius armlies at a closer distance of ~1 kpc, instead of previously assumed ~2-3 kpcfrom kinematic distances. The previously suggested deviation of the Sagittariusarm toward the Galactic center from the symmetrically fitted model (Taylor &Cordes 1993) is likely due to large errors of kinematic distances at lowgalactic longitudes. G14.33-0.64 most likely traces the near side of theSagittarius arm. We attempted fitting the pitch angle of the arm with otherparallax measurements along the arm, which yielded two possible pitch angles ofi=34.7+/-2.7 degrees and i=11.2+/-10.5 degrees. Our proper motion measurementssuggest G14.33-0.64 has no significant peculiar motion relative to thedifferential rotation of the Galaxy (assumed to be in a circular orbit),indicating that the source motion is in good agreement with the Galacticrotation.

Distance to G14.33-0.64 in the Sagittarius Spiral Arm: H2O Maser Trigonometric Parallax with VERA