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The Transiting Exoplanet Survey Satellite (TESS) recently observed 18transits of the hot Jupiter WASP-4b. The sequence of transits occurred 81.6$\pm$ 11.7 seconds earlier than had been predicted, based on data stretchingback to 2007. This is unlikely to be the result of a clock error, because TESSobservations of other hot Jupiters (WASP-6b, 18b, and 46b) are compatible witha constant period, ruling out an 81.6-second offset at the 6.4$\sigma$ level.The 1.3-day orbital period of WASP-4b appears to be decreasing at a rate of$\dot{P} = -12.6 \pm 1.2$ milliseconds per year. The apparent period changemight be caused by tidal orbital decay or apsidal precession, although bothinterpretations have shortcomings. The gravitational influence of a third bodyis another possibility, though at present there is minimal evidence for such abody. Further observations are needed to confirm and understand the timingvariation.

WASP-4b Arrived Early for the TESS Mission