According to wikipedia it has a non-primary axis rotation which is characterized as "tumbling": > ʻOumuamua is not rotating around its principal axis, and its

According to wikipedia it has a non-primary axis rotation which is characterized as "tumbling": > ʻOumuamua is not rotating around its principal axis, and its motion may be a form of tumbling.[16][90] This accounts for the various rotation periods reported, such as 8.10 hours (±0.42 hours[18] or ±0.02 hours[17]) by Bannister et al. and Bolin et al. with a lightcurve amplitude of 1.5–2.1 magnitudes,[17] whereas Meech et al. reported a rotation period of 7.3 hours and a lightcurve amplitude of 2.5 magnitudes.[91][n] Most likely, ʻOumuamua was set tumbling by a collision in its system of origin, and remains tumbling since the time scale for dissipation of this motion is very long, at least a billion years.[16][92]