Kinematic and Spectroscopic Constraints on the Origin of Interstellar Object 3I/ATLAS: An Ablative Propulsion Model

PREPRINT — Not Yet Peer-Reviewed This manuscript presents a comprehensive kinematic and spectroscopic analysis of Interstellar Object 3I/ATLAS (C/2024 S1), identifying four correlated anomalies statistically inconsistent with natural cometary outgassing: 1. Compositional anomaly: Complete Iron/Nickel dissociation (Fe/Ni ≈ 0.02:1 vs. solar 1.8:1), implying artificial refining2. Dynamic pressure violation: A collimated sunward jet penetrating 100,000 km against solar wind pressure3. Geometric precision: A persistent three-fold rotational symmetry (120° ± 3°) in the venting structure4. Trajectory control: Non-gravitational acceleration (3 × 10⁻¹⁰ AU/d²) consistent with a controlled braking maneuver To resolve these anomalies, we propose a "Hybrid" ablative propulsion model: a solid-state refractory core encased in a harvested volatile shell. We provide rigorous thermodynamic mass budget analysis and Bayesian probability assessment that systematically rejects alternative natural models, including recent CO-sublimation hypotheses. This work is grounded in real observational data (HST/ACS, VLT/FORS2, Swift UVOT) and offers two specific, falsifiable predictions for March 2026: - Abrupt valve closure: OH production drops from 40 to