According to this article, the strongly magnetized object hypothesis is unlikely to be the only source of anomalous acceleration. To quote: (Changed some of the typography to make it more readable.) I'm somewhat interested in the odds of an interstellar object not having a neutral magnetic field. Intuitively, lack of net charge or magnetization should be the norm but I'm far out of my depth here. Also: consider yourself prompted.If ‘Oumuamua had a strong magnetic field, then interaction with solar wind could affect its motion. Assuming a dipole field, a plasma-fluid model and typical solar wind speed and proton number density, we find the resulting acceleration for an object of the nominal size of ‘Oumuamua to be only 2 × 10^(-11) m/s², too small by a factor of about 10^5, even if we adopt the high magnetization and density of asteroid (9969) Braille.