(a) For the Flyby_7943 simulation, the distribution of s_2ω at t = 1 Myr is shown for q  <  4 orbits with a  >  18,400 au (solid blue) and with 10⁴ au < a < 18,400 au (solid orange). Orbits are weighted by their orbital frequency. The s_2ω distribution is also shown for LPCs making q  <  4 au perihelion passages 2–3 Myr after HD 7977’s encounter, weighted using Equation (1). Distributions are shown for LPCs with a > 10⁴ au (dotted blue) and with 10³ au < a < 10⁴ au (dotted orange). (b) For each of our HD 7977 passage simulations, the fraction of q  <  4 au orbits with s_2ω < 0 at t = 1 Myr is plotted against HD 7977’s impact parameter. These fractions are calculated for orbits with a  >  18,400 au (blue) and with 10⁴ au < a < 18,400 au (orange). Dashed lines mark the fractions for observed dynamically new LPCs (blue) and observed young returning LPCs (orange). (c) At t = 1 Myr, the relative fractions of q  <  4 au orbits with a  >  18,400 au (blue) and with 10⁴ au < a < 18,400 au (orange) are plotted against HD 7977’s impact parameter.