Top left: histogram of stellar velocities in the rest frame of OBP-B1, separated into the stars from OBP-Near and Briceño-1. This is done since OBP-Near exhibits more coherent and faster motion than Briceño-1, so this serves as a natural division to test for gravitational drag. Taking the median velocities of both OBP-Near and Briceño-1 reveals a velocity difference of 1.86 km s⁻¹. Bottom left: an estimate of the velocity gained by gravitational acceleration from the nearby gas clouds, Δv, over a period of dt = 10 Myr (see Equation (7)). This calculation explains a velocity difference of 0.63 km s⁻¹, which is lower than the observed velocity difference by a factor of 3. Right: projection of dust density, stellar positions, and stellar velocity vectors on the X–Y Galactic Cartesian plane. The colors indicate the predicted difference in velocity due to the accumulated gravitational acceleration over 10 Myr by the dust and gas. Red indicates a star has likely been accelerated by the gas, and blue indicates a star has likely been decelerated by the gas.