Kepler-1411 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1411 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1411, located approximately 5415.8 light-years (1660.48 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.079% across the stellar disk), this world measures 2.82 Earth radii and has a measured mass of 8.35 Earth masses. Combining its mass and radius yields a mean bulk density of 2.05 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.05 g⊕ (10.3 m/s²), and an escape velocity of 19.2 km/s.

In its orbital architecture around Kepler-1411, Kepler-1411 b completes one full revolution every 86.115 Earth days at a semi-major axis of 0.4001 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 50.5 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 441 K (+168°C / +334°F) and receiving 8.93 S⊕ (~12,150 W/m²), Kepler-1411 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1411 is classified as a stellar host with an effective photospheric temperature of 5,664 K, a radius of 0.92 R☉, a mass of 0.95 M☉, an estimated bolometric luminosity of 0.782 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.17 Gyr and a metallicity of [Fe/H] = -0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-1411 shines at apparent V-band magnitude 15.945 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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