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an open source database of all discovered extrasolar planets

The Open Exoplanet Catalogue is a catalogue of all discovered extra-solar planets. It is a new kind of astronomical database, based on small text files and a distributed version control system. It is decentralized and completely open. Contribution and corrections are welcome. The Open Exoplanet Catalogue is furthermore the only catalogue that can correctly represent the orbital structure of planets in arbitrary binary, triple and quadruple star systems as well as orphan planets.


Number of confirmed exoplanets 1843
Total number of planets (including Solar System objects and unconfirmed exoplanets) 1905
Number of planetary systems 1159
Number of binary systems 95
Number of commits 6949
List of contributors Andrew Tribick, Christian Sturm, Hanno Rein, Jaroslav Merc, Marc-Antoine Martinod, Ryan Varley, Knutover, Tobias Mueller, Allen B. Davis, Sol-D, Daveshoszowski, Marc-Antoine, Kenneth J Cott, Christian Sturm, Cadenarmstrong, Kevin Knittel, James Gregory, Miguel De Val-Borro, Darryl Hemsley, Allen Davis, Rajeev-Jeyaraj, Callum Rodwell, Planetaryscience, Dave, Orome, Allen Davis

starData access

The main repository of the Open Exoplanet Catalogue is hosted on github. This website is just a front end.

You do not need to use this website to access the database. You can even build your own front end. All information on this page is directly generated from the XML files in the catalogue. If you are interested in how, look at the source code of each page or look at the oec_web repository on github.

starThe XML file format and the version control system git

The data in the Open Exoplanet Catalogue is stored in human readable XML files. There is one separate file for each planetary system. The combination of small text files and a human readable file format makes the entire catalogue work smoothly with git, a popular version control system used to manage different versions of the catalogue. If you are not familiar with git, you can simply ignore this. However, git allows you to keep your local database in sync with the main repository on github. You can make correction to the files and submit them back to github to be included in the main repository (you can either ask to get write access or send a pull request). Furthermore, you can trace back all changes made to every parameter and find out who made a certain entry and on what date. The git commit message usually includes the reference to the scientific paper where the data is taken from. Thus, you can easily find the scientific reference for every value in the catalogue.

If you are more familiar with simple comma or tab-separated ASCII tables, you can find these in the oec_tables repository on github. They contain mostly the same information as the XML files. However, some information, especially in the case of a binary system cannot be easily represented in an ASCII table. You are therefore encouraged to use the original XML files provided by the Open Exoplanet Catalogue.

If you want to learn how to parse XML fils with python to create plots from this catalogue, have a look at the oec_plots repository on github.

Please consider contributing to the Open Exoplanet Catalogue! You will find a dedicated tutorial on how to make a contribution at Or watch this video which also shows you the basic steps.