Temporal evolution of the physical libration in longitude τ of Phobos over 40 years a) and 18 h b). The thickness of the line in panel a) is due to rapid oscillations with an amplitude of ± 1 degree at the orbital period of Phobos as shown in panel b). The trend in panel a) is quadratic and corresponds to the tidal evolution of the orbit (semi-major axis decay).
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