The Habitable Worlds Catalog (HWC) is an online database for scientists and educators about potentially habitable world discoveries. The catalog uses habitability metrics and classifications to compare exoplanets. The HWC is a project of the Planetary Habitability Laboratory @ the University of Puerto Rico at Arecibo since 2011.

Catalog Features

The HWC includes stellar and planetary properties not available in other exoplanet catalogs. Some of these properties are:

How to Use the Catalog

Here are some examples of how to use the HWC for research purposes:

How to Cite the Catalog

The Habitable Worlds Catalog (HWC), PHL @ UPR Arecibo (phl.upr.edu/hwc), or just PHL @ UPR Arecibo.

PHL @ UPR Arecibo (YEAR, MONTH DAY). The Habitable Worlds Catalog (HWC). http://phl.upr.edu/hwc, and inline citation (PHL @ UPR Arecibo, YEAR), where YEAR, MONTH DAY is the date the website information was retrieved.


The Habitable Worlds Catalog acknowledges the use of the following resources:

What happened to the original Habitable Exoplanets Catalog (HEC)?

The HEC was replaced with the HWC in January 2024. The change in name to "worlds" is to be more inclusive and encompass not just exoplanets but also moons and other objects in the Solar System that might be capable of supporting life. There are new plans to combine the exoplanet and Solar System data in the catalog for comparison purposes. All the previous citation links of the HEC will continue to work or point to the new version of the catalog.


Contact Prof. Abel MĂ©ndez for any corrections or suggestions. Follow @PlanetaryHabLab for catalog updates.