From the Spin Doctors
Nucleus Rotation Period
There seems to be nearly universal agreement that the rotation
state of Hale-Bopp is simple and that the period is ~11.4 hours.
Lecacheux, Jorda & Colas (1997) 11.47 ± 0.05 hours
Licandro et al. (1998) 11.34 ± 0.02 “
Schleicher et al. (1998) 11.309 ± 0.005 “
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