Spectral and Radiative Predictions for the Jovian Impedance Gradient (SPT v1.3 — Part X)

This work presents SPT v1.3 — Part X, providing the first integrated structural interpretation of the anti-tail morphology, radiative asymmetries, and phase-coupling anomalies recently observed in the interstellar object 3I/ATLAS (C/2025 A11). The analysis incorporates the newest public datasets released by NASA missions between late December 2025 and 9 January 2026, including Hubble imaging of the anti-tail, JWST mid-infrared thermal profiles, and coordinated ground-based photometry (ZTF, ATLAS, LSST). Within the Structural Flux Paradigm, the anti-tail is not interpreted as a purely geometric or dust-dynamical phenomenon. Instead, it emerges as a substrate-drag diagnostic, generated when the object traverses regions of non-uniform structural impedance in the viscoelastic vacuum (Pleroma). Variations in coupling efficiency (η), substrate tension, and residual radiative dissipation (ℛ) produce observational signatures that mimic classical dust-alignment effects while introducing detectable departures from standard cometary behavior. This document formalizes the predictive structural response of 3I/ATLAS to impedance gradients—especially the Jovian interaction window expected in March 2026—providing clear, falsifiable observational tests. No claims beyond publicly available data are made; all interpretations remain within the theoretical framework established in Parts I–IX of SPT v1.3. As with all components of the frozen v1.3 release, this work receives an independent DOI for traceability, archival integrity, and citation stability.