Kapteyn's star is named in honor of its discoverer, the Dutch astronomer Jacobus Kapteyn. The planetary system is roughly 11 billion years old and contains at least one other planet, Kapteyn b, which is close to a 5:2 period commensurability. Link to scientific paper Your name Note: Your commit will be vetted before it is merged into the public version. It is crucial that you include a link to a scientific publication. For more information on the meaning of the different datafields see the readme file in the Open Exoplanet Catalogue repository on github.