Kepler-1933 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1933 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1933, located approximately 1069.8 light-years (328.01 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0115% across the stellar disk), this world measures 1.18 Earth radii and has a measured mass of 1.76 Earth masses. Combining its mass and radius yields a mean bulk density of 5.91 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.26 g⊕ (12.36 m/s²), and an escape velocity of 13.7 km/s.

In its orbital architecture around Kepler-1933, Kepler-1933 b completes one full revolution every 4.943 Earth days at a semi-major axis of 0.05605 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 123.4 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 1058 K (+785°C / +1445°F) and receiving 250.50 S⊕ (~340,931 W/m²), Kepler-1933 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1933 is classified as a stellar host with an effective photospheric temperature of 5,661 K, a radius of 1.008 R☉, a mass of 0.964 M☉, an estimated bolometric luminosity of 0.936 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.86 Gyr and a metallicity of [Fe/H] = 0.1 dex (metal-rich relative to the Sun). From Earth, Kepler-1933 shines at apparent V-band magnitude 12.81 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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