Kepler-485 b

Astrophysical Synthesis & Habitability Characterization

Kepler-485 b is a confirmed gas giant exoplanet orbiting the star Kepler-485, located approximately 3721.3 light-years (1140.95 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 1.469% across the stellar disk), this world has a measured radius of 14.41 Earth radii (1.29 R♃), though radial-velocity mass constraints remain unmeasured in the current composite catalogue.

In its orbital architecture around Kepler-485, Kepler-485 b completes one full revolution every 3.243 Earth days at a semi-major axis of 0.04401 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 147.6 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 1243 K (+970°C / +1778°F) and receiving 622.01 S⊕ (~846,561 W/m²), Kepler-485 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-485 is classified as a stellar host with an effective photospheric temperature of 5,958 K, a radius of 1.09 R☉, a mass of 1.07 M☉, an estimated bolometric luminosity of 1.343 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.72 Gyr and a metallicity of [Fe/H] = 0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-485 shines at apparent V-band magnitude 15.069 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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