ABSTRACT
The interstellar comet 3I/ATLAS exhibited a measurable non-gravitational acceleration similar in form to that of 1I/‘Oumuamua but of smaller magnitude. Using thermophysical and Monte Carlo models, we demonstrate that this acceleration can be fully explained by anisotropic outgassing of conventional volatiles, primarily CO and CO2, under realistic surface and rotational conditions. The model incorporates diurnal and obliquity-averaged energy balance, empirical vapor-pressure relations, and collimated jet emission from localized active regions. Mixed CO–CO2 compositions reproduce both the magnitude and direction of the observed acceleration with physically plausible active fractions below one percent for nucleus radii between 0.5 and 3 km. Less volatile species such as NH3 and CH4 underproduce thrust at equilibrium temperatures near 1 AU. These results eliminate the need for non-physical or exotic explanations and define thermophysical limits for natural acceleration mechanisms in interstellar comets.
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