Kepler-1810 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1810 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1810, located approximately 3293.8 light-years (1009.87 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.125% across the stellar disk), this world measures 3.918 Earth radii (0.35 Jupiter radii) and has a measured mass of 14.6 Earth masses. Combining its mass and radius yields a mean bulk density of 1.34 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 21.6 km/s.

In its orbital architecture around Kepler-1810, Kepler-1810 b completes one full revolution every 101.133 Earth days at a semi-major axis of 0.4137 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 44.5 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 380 K (+107°C / +225°F) and receiving 4.91 S⊕ (~6,683 W/m²), Kepler-1810 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1810 is classified as a stellar host with an effective photospheric temperature of 5,492 K, a radius of 1.016 R☉, a mass of 0.921 M☉, an estimated bolometric luminosity of 0.843 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.5 Gyr and a metallicity of [Fe/H] = 0.16 dex (metal-rich relative to the Sun). From Earth, Kepler-1810 shines at apparent V-band magnitude 15.4 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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