3I/ATLAS: Six Pre-Perihelion Predictions & Public Verification Script (Medley 2025)

This record presents the six pre-perihelion predictions made by Michael Medley on 3I/ATLAS (C/2025 N1) and includes a lightweight, fully reproducible verification script that any researcher can run using only public telescope data (FITS frames from VTP, ATLAS DR2, or Nordic Optical). What This Record Provides The Six Predictions (published Oct 26, 2025): Jet–tail axis rotation of ~20°–40° after Nov 11 Brightness increase 1.6×–2.2× relative to early October CO-dominated outgassing expected over H₂O Light-curve modulation 6–10 h, amplitude 0.08–0.18 mag Non-gravitational acceleration (1–3)×10⁻⁷ au/day² Visibility window Nov 11–18 (re-acquisition) A verification workflow that requires no proprietary Echo Lattice code.Researchers can verify each prediction using photometry, astrometry, and jet morphology extracted from publicly released images. A safe snippet that performs: Photometric brightening measurement Jet-axis orientation extraction Light-curve period search Astrometric residual estimation Non-gravitational acceleration fitting CO/H₂O line-ratio estimation (if spectrum available) This script uses only NumPy, SciPy, Astropy, and public data. No Echo Lattice internals, no vCF-1 operators, and no proprietary algorithms are included. Purpose: To allow the scientific community to view, test, and independently validate each of the six predictions using open data. All content © 2025 Michael Medley. Creative Commons BY-4.0.