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We report trigonometric parallaxes for the massive star-forming regionsG23.01-0.41 and G23.44-0.18, corresponding to distances of 4.59 [+0.38/-0.33]kpc and 5.88 [+1.37/-0.93] kpc, respectively. The distance to G23.01-0.41 issmaller than its near kinematic distance assuming a standard model of the MilkyWay and less than half of its far kinematic distance, which has usually beenassumed. This places it in the Crux-Scutum spiral arm. The distance toG23.44-0.18 is close to its near kinematic distance and most likely places itin the Norma spiral arm near the end of the Galactic bar. Combining thedistance and proper motions with observed radial velocities gives the locationand full space motion of the star forming regions. We find large deviationsfrom circular Galactic orbits for these sources: both sources show peculiarmotions of 20 to 30 km/s counter to Galactic rotation and toward the Galacticcenter. These large peculiar motions might be the result of gravitationalperturbations from the Galactic bar.

Trigonometric Parallaxes of Massive Star Forming Regions: V. G23.01-0.41 and G23.44-0.18