A WHFast test of 128 coplanar HD 184010 orbit states gives 10 Hill-sphere encounters within 10,000 inner orbits

We test orbit states from the public HD 184010 CINEMAS sample bank. We draw 128 states with replacement after the published burn-in and use WHFast to integrate three coplanar prograde planets. A close encounter occurs when fixed initial individual Hill spheres overlap. 10 draws reach this limit within 10,000 inner planet orbits. The event fraction is 7.8%; its exact 95% sampling interval is 3.8% to 13.9%. Lower saved SPOCK scores rank early encounters with AUC 0.897 (95% bootstrap interval 0.815 to 0.959). The half-step repeat changes 1 label in 32 draws. We also repeat all 10 main early-encounter draws at half the step. In this separate check, 7 encounters recur by 10,000 orbits. IAS15 finds encounters by that limit for 6 of those 10 draws. 5 states reach an encounter with all three setups. Both pilot encounters selected for an IAS15 check recur, but their times change. In a fixed subset of 32 draws, 4 reach an encounter within 100,000 orbits. The score check reproduces 24 saved model scores within 3e-8. The package contains the source bank, selected states, numerical results, figures, and code. These results describe the fixed archived bank under the tested model. They do not test probability calibration at the SPOCK target of one billion orbits. They do not establish survival to the stellar age or give a new mass posterior.

HD 184010 · planetary dynamics · dynamical stability · CINEMAS · SPOCK · radial velocity · reproducibility · numerical integration