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Transit events of extrasolar planets offer a wealth of information forplanetary characterization. However, for many known targets, the uncertainty oftheir predicted transit windows prohibits an accurate scheduling of follow-upobservations. In this work, we refine the ephemerides of 21 Hot Jupiterexoplanets with the largest timing uncertainty. We collected 120 professionaland amateur transit light curves of the targets of interest, observed with 0.3mto 2.2m telescopes, and analyzed them including the timing information of theplanets discovery papers. In the case of WASP-117b, we measured a timingdeviation compared to the known ephemeris of about 3.5 hours, for HAT-P-29b andHAT-P-31b the deviation amounted to about 2 hours and more. For all targets,the new ephemeris predicts transit timings with uncertainties of less than 6minutes in the year 2018 and less than 13 minutes until 2025. Thus, our resultsallow for an accurate scheduling of follow-up observations in the next decade.

Ephemeris refinement of 21 Hot Jupiter exoplanets with high timing uncertainties