Kepler-1883 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1883 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1883, located approximately 4493.2 light-years (1377.61 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0847% across the stellar disk), this world measures 3.251 Earth radii (0.29 Jupiter radii) and has a measured mass of 10.6 Earth masses. Combining its mass and radius yields a mean bulk density of 1.7 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 20.2 km/s.

In its orbital architecture around Kepler-1883, Kepler-1883 b completes one full revolution every 103.427 Earth days at a semi-major axis of 0.4438 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 46.7 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 416 K (+143°C / +289°F) and receiving 7.08 S⊕ (~9,636 W/m²), Kepler-1883 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1883 is classified as a stellar host with an effective photospheric temperature of 6,208 K, a radius of 1.024 R☉, a mass of 1.086 M☉, an estimated bolometric luminosity of 1.397 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.12 dex (metal-poor relative to the Sun). From Earth, Kepler-1883 shines at apparent V-band magnitude 15.642 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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