Results of the search for the sidereal period of rotation for the P₂ solution. The search interval has been defined by the range of change of the synodic period. On the vertical axis there is a value of (χ² per degree of freedom). A horizontal line indicates a p value of 0.01. The only statistically significant minimum (which reaches below p = 0.01) is P_sid = 0.013760 ± 0.000001 h.