Kepler-1830 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1830 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1830, located approximately 3447.1 light-years (1056.88 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0223% across the stellar disk), this world measures 3.33 Earth radii (0.3 Jupiter radii) and has a measured mass of 11.1 Earth masses. Combining its mass and radius yields a mean bulk density of 1.66 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1 g⊕ (9.81 m/s²), and an escape velocity of 20.4 km/s.

In its orbital architecture around Kepler-1830, Kepler-1830 b completes one full revolution every 56.493 Earth days at a semi-major axis of 0.31769 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 61.2 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 681 K (+408°C / +766°F) and receiving 35.80 S⊕ (~48,724 W/m²), Kepler-1830 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1830 is classified as a stellar host with an effective photospheric temperature of 6,160 K, a radius of 2.046 R☉, a mass of 1.443 M☉, an estimated bolometric luminosity of 5.408 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.4 Gyr and a metallicity of [Fe/H] = 0.24 dex (metal-rich relative to the Sun). From Earth, Kepler-1830 shines at apparent V-band magnitude 13.605 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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