JuMBOs as Technosignature Platforms: Observable Predictions for 2030

Abstract Jupiter-Mass Binary Objects (JuMBOs), discovered by JWST in the Orion Nebula Cluster (Pearson & McCaughrean 2023), exhibit an anomalously high binary fraction (8-9%) compared to theoretical predictions (<1-2%). We propose that a subset of these objects may represent artificially modified platforms optimized for post-AGI civilization stealth operations. This hypothesis integrates astrophysical observations, AGI existential risk frameworks, and engineering feasibility analysis to generate testable predictions for 2030-era instruments. The Roman Space Telescope and Extremely Large Telescope will provide definitive tests through: (1) persistent wide-binary excess in field populations, (2) thermal signatures exceeding natural cooling models by 50-100 K, and (3) deuterium depletion in atmospheric spectroscopy. If confirmed, P(artificial modification) crosses 50%; if null, the hypothesis drops below 10%. This single, instrument-timed test renders the theory maximally falsifiable within the current decade. Regardless of outcome, the framework demonstrates how contemporary astrophysical anomalies can generate rigorous technosignature hypotheses with near-term observational resolution. v4 Critical Updates Notice (April 2026): Spectroscopic follow-up work published since the original deposit has substantially eroded the observational foundation of the headline 20–28% probability assignment above. Luhman 2024 (photometric reanalysis), Luhman 2025 (NIRSpec spectroscopic confirmation of seven JuMBOs as background sources), and Rodriguez et al. 2025 (radio reassessment of JuMBO 24) collectively reduce the count of spectroscopically confirmed JuMBOs to zero as of April 2026, with only JuMBO 29 surviving as a viable photometric candidate pending spectroscopic test. The current best assessment, conditional on the April 2026 evidence base, places the artificial-modification hypothesis at 5–10% pending spectroscopic confirmation of any individual candidate, with the broader CADH/AD combinatorial framework revised from 60–85% to approximately 55–78% confidence. The technosignature framing is suspended, not withdrawn, with explicit reactivation criteria tied to upcoming Roman Telescope and JWST observations. Readers should consult the Postscript at the end of this document before drawing conclusions from the analysis that follows; the body of the paper is preserved as the state of evidence at original deposit, with the postscript representing the current assessment. See also -- JuMBOs as Potential AGI Stealth Platforms Supplementary - Appendices A, C, and D; and Sensitity Analysis: JuMBOs Artificial Hypothesis.