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We have performed simulations of the long-term evolution of the spin state of small active comet nuclei (1 km and 0.6 km) in the orbit of 46P/Wirtanen under the effect of the torque of the nongravitational force. A total of 46 combinations of irregular shapes and activity patterns have been simulated. We observe typical changes of the spin period of 0.01−10 h at each perihelion passage during the simulations, depending on the initial spin period and on the temporal evolution of the spin state.doi:10.1051/0004-6361:20030845 fatcat:cocp2l372jbopcmmfngipt6qrm