New VLBA parallaxes for four masers refine the Perseus arm position and pitch angle in the first Galactic quadrant, with extrapolation showing intersection with the Sagittarius arm at 200° azimuth and 5.6 kpc radius.
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An updated model for the Perseus Spiral Arm from Trigonometric Parallax and 3-dimensional kinematic distances of distant massive stars
New VLBA parallaxes for four masers refine the Perseus arm position and pitch angle in the first Galactic quadrant, with extrapolation showing intersection with the Sagittarius arm at 200° azimuth and 5.6 kpc radius.