Astronomy & Space. The Habitable Exoplanets Catalog. The figure above shows all planets near the habitable zone (darker green shade is the conservative habitable zone and the lighter green shade is the optimistic habitable zone).
Only those planets 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). Size of the circles corresponds to the radius of the planets (estimated from a mass-radius relationship when not available). Larger version here. Credit: PHL @ UPR Arecibo. Planetary Names: Welcome. Extrasolar-planets.com. The Extrasolar Planets Encyclopaedia. Exoplanet Orbit Database.