Abstract
<jats:p>The theoretical framework for the existence of Planet 9, optimized via the Sabne Dragonfly-ETNOBatygin-Brown Predictive Interception Model (SDEBB-PIM), yields a highly constrained phase-space architecture for a 6.0M⊕ perturber. To translate these theoretical parameters into a concrete observational roadmap, we deployed a suite of high-precision N-body integrations using the REBOUND symplectic integrator. This paper presents a tripartite computational strategy: (1) A forward-integrated multiyear ephemeris (2026–2031) validating an intrinsic barycentric proper motion of 0.167 arcsec/day; (2) A historical retro-integration (precovery) engine providing sexagesimal target fields for legacy surveys including IRAS (1983) and WISE (2014); and (3) A high-cadence synthetic tracking vector engine generating hourly angular velocity gradients (dα/dt, dδ/dt) for shift-and-stack observational pipelines. These computational results drastically narrow the search volume in the constellation Taurus, offering immediate targets for deep-stack archival mining and next-generation transient surveys like the Vera C. Rubin Observatory.</jats:p>