The Habitable Exoplanets Catalog

Conservative Sample of Potentially Habitable Exoplanets

This is a list of the exoplanets that are more likely to have a rocky composition and support surface liquid water (i.e., 0.5 < Planet Radius ≤ 1.6 Earth radii or 0.1 < Planet Minimum Mass ≤ 3 Earth masses). They are represented artistically in the top image.

Optimistic Sample of Potentially Habitable Exoplanets

This is a list of the exoplanets that are less likely to have a rocky composition or maintain surface liquid water (i.e. 1.6 < Planet Radius ≤ 2.5 Earth radii or 3 < Planet Minimum Mass ≤ 10 Earth masses). Some of these planets might turn out to be ocean worlds or mini-Neptunes.

Tables Legend

• Name - Name of the planet. This links to the data of the planet at the NASA Exoplanet Archive.

• Type - PHL's classification of planets that includes host star spectral type (F, G, K, M), habitable zone location (hot, warm, cold), and size (miniterran, subterran, terran, superterran, jovian, neptunian) (e.g., Earth = G-Warm Terran, Venus = G-Hot Terran, Mars = G-Warm Subterran).

• Mass - Mass of the planet in Earth masses (Earth = 1.0 M_E). Mass was estimated (~) from radius when not available using Chen & Kipping (2017). Usually, we only know the minimum (≥) mass.

• Radius - Radius of the planet in Earth radii (Earth = 1.0 R_E). Radius was estimated (~) from mass when not available using Chen & Kipping (2017).

• Flux - Average stellar flux of the planet in Earth fluxes (Earth = 1.0 S_E).

• T_surf - Estimated (~) surface temperature in Kelvins (K) assuming an Earth-like atmosphere (i.e. same bond albedo and greenhouse) using Méndez & Rivera-Valentín (2017). Temperatures could be much larger for thicker atmospheres (Earth = 288 K).

• Period - Orbital period in days (Earth = 365 days).

• Distance - Distance from Earth in light-years (ly).

• ESI - Earth Similarity Index, a measure of similarity to Earth's stellar flux, and mass or radius (Earth = 1.0). Results are sorted by this number. Planets more similar to Earth are not necessarily more habitable.

• (N) = new in 2022 or 2023

Habitable Zone Plot

The figure above shows all planets near the habitable zone (the darker green shade is the conservative habitable zone and the lighter green shade is the optimistic habitable zone). Only those planets with less than 10 Earth masses or 2.5 Earth radii are labeled. The different limits of the habitable zone are described in Kopparapu et al. (2014). The size of the circles corresponds to the radius of the planets. They are estimated by the mass-radius relationship of Chen & Kipping (2017) when not available. Larger version here. Credit: PHL @ UPR Arecibo.

Stellar Map

Location in the night sky of all the known stellar systems with potentially habitable worlds (some systems have more than one planet). Click the image to enlarge. Larger version here. Credit: PHL @ UPR Arecibo, Jim Cornmell.

Stellar System Plots (Conservative Sample)