Transit timing en masse

This website provides results from the article titled “TESS Transit Timing of Hundreds of Hot Jupiters”.

We provide a database of transit times and updated ephemerides for 382 planets based on data from the NASA Transiting Exoplanet Survey Satellite (TESS) and previously reported transit times which were scraped from the literature in a semi-automated fashion. In total, our database contains 8,667 transit timing measurements for 382 systems. About 240 planets in the catalog are hot Jupiters that have been observed by TESS. The new ephemerides are useful for scheduling follow-up observations and searching for long-term period changes. WASP-12 remains the only system for which a period change is securely detected. We remark on other cases of interest, such as a few systems with suggestive (but not yet convincing) evidence for period changes, and the detection of a second transiting planet in the NGTS-11 system. The compilation of light curves, transit times, ephemerides, and timing residuals are made available on this website, along with the Python code that generated them.


The Database page provides a link to download the entire transit time database containing 8,667 timing measurements for 382 systems. You may also download a table with ephemerides from this page.

The Ephemerides page provides updated ephemerides for each of the 382 targets.

You may use the Search bar to look up data for a specific planet. The resulting page will contain a given planet’s ephemeris and O-C diagram, individual transit times as well as figures of TESS light curves from which transit times were derived in this work (if available).


We would like to thank Betsy Pu for her help with the development of our project’s website. We are also grateful to Filip Walter for compiling and providing the Exoplanet Transit Database in a convenient format, although we ultimately did not include those data in our analyses. We thank Sarah Millholland, Vadim Krushinsky, and Luke Bouma for helpful comments on the draft of this paper. This work was supported by the Heising-Simons Foundation and the NASA TESS mission. This work relied on the NASA Astrophysics Data System and the arXiv. We also acknowledge the use of the Extrasolar Planets Encyclopedia at; the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. The authors are pleased to acknowledge that the work reported in this paper was substantially performed using the Princeton Research Computing resources at Princeton University which is a consortium of groups led by the Princeton Institute for Computational Science and Engineering and Office of Information Technology’s Research Computing.