Kepler-1719 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1719 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1719, located approximately 2953 light-years (905.41 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0416% across the stellar disk), this world measures 3.95 Earth radii (0.35 Jupiter radii) and has a measured mass of 14.8 Earth masses. Combining its mass and radius yields a mean bulk density of 1.32 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.95 g⊕ (9.32 m/s²), and an escape velocity of 21.7 km/s.

In its orbital architecture around Kepler-1719, Kepler-1719 b completes one full revolution every 6.15 Earth days at a semi-major axis of 0.06868 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 121.5 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.

⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1287 K (+1014°C / +1857°F) and receiving 686.90 S⊕ (~934,871 W/m²), Kepler-1719 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1719 is classified as a stellar host with an effective photospheric temperature of 5,687 K, a radius of 1.775 R☉, a mass of 1.08 M☉, an estimated bolometric luminosity of 2.957 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.61 Gyr and a metallicity of [Fe/H] = 0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-1719 shines at apparent V-band magnitude 13.478 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

Discovery Facility: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).