Kepler-1994 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1994 b is a confirmed sub-earth exoplanet orbiting the star Kepler-1994, located approximately 789.3 light-years (241.99 parsecs) from the Solar System. First announced in 2023 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0024% across the stellar disk), this world measures 0.51 Earth radii and has a measured mass of 0.087 Earth masses. Combining its mass and radius yields a mean bulk density of 3.62 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 0.33 g⊕ (3.24 m/s²), and an escape velocity of 4.6 km/s.

In its orbital architecture around Kepler-1994, Kepler-1994 b completes one full revolution every 4.612 Earth days at a semi-major axis of 0.053 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 125 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 1032 K (+759°C / +1398°F) and receiving 268.27 S⊕ (~365,115 W/m²), Kepler-1994 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1994 is classified as a stellar host with an effective photospheric temperature of 5,495 K, a radius of 0.961 R☉, a mass of 0.932 M☉, an estimated bolometric luminosity of 0.755 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.01 Gyr and a metallicity of [Fe/H] = 0.16 dex (metal-rich relative to the Sun). From Earth, Kepler-1994 shines at apparent V-band magnitude 12.01 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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