Kepler-670 b

Astrophysical Synthesis & Habitability Characterization

Kepler-670 b is a confirmed gas giant exoplanet orbiting the star Kepler-670, located approximately 3065 light-years (939.74 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 1.4897% across the stellar disk), this world has a measured radius of 13.18 Earth radii (1.18 R♃), though radial-velocity mass constraints remain unmeasured in the current composite catalogue.

In its orbital architecture around Kepler-670, Kepler-670 b completes one full revolution every 2.817 Earth days at a semi-major axis of 0.0383 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 147.9 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 1219 K (+946°C / +1735°F) and receiving 528.22 S⊕ (~718,912 W/m²), Kepler-670 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-670 is classified as a stellar host with an effective photospheric temperature of 5,709 K, a radius of 0.99 R☉, a mass of 0.99 M☉, an estimated bolometric luminosity of 0.934 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.79 Gyr and a metallicity of [Fe/H] = 0.07 dex (metal-rich relative to the Sun). From Earth, Kepler-670 shines at apparent V-band magnitude 15.162 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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