Trajectory of a gravitationally bound second Larson core (SC). The color-coded curve traces the computed orbital path over a 10-kyr integration, with color progression indicating temporal evolution. The initial velocity is determined via momentum-weighted averaging within a 5 AU sphere (white dashed line) centered on the fragment’s density maximum (magenta point). The red contour delineates the fragment boundary based on temperature-density criteria and the blue dashed circle marks the Hill radius. The background displays the midplane gas density. The highly eccentric orbit (e ≈ 0.55) and declining periastron illustrate the rapid inward migration expected for companions formed via disk fragmentation around massive stars.