Spin-Modulated Outgassing as a Natural Propulsion Mechanism in Interstellar Comet 3I/ATLAS

This research note presents a novel interpretation of the interstellar comet 3I/ATLAS, discovered in 2025. Unlike most comets, ATLAS exhibits activity dominated by carbon dioxide, significant outgassing at unusually large distances from the Sun, and irregular tail brightness. While these anomalies have been reported, no unifying mechanism has been formally applied. The hypothesis advanced here proposes that ATLAS’ unique behavior is best explained by spin-modulated outgassing. As the nucleus tumbles gyroscopically, vents and cracks alternately narrow and widen relative to solar heating. This geometry causes sublimation jets to pulse like a rotating sprinkler system. The effect is amplified by exponential sublimation of CO₂ as ATLAS approaches the Sun, producing apparent self-propulsion, enhanced tail luminosity, and measurable non-gravitational path shifts. This mechanism is consistent with well-established cometary physics but has not yet been explicitly applied to 3I/ATLAS in published literature. The attached supporting data demonstrate how ATLAS’ observed composition, distance of activation, brightness fluctuations, and trajectory deviations align with this interpretation. Together, they suggest that volatile-rich interstellar comets can appear more “self-propelled” than typical water-ice comets, offering a natural, high-probability explanation for ATLAS’ unusual characteristics.