Kepler-392 c
Astrophysical Synthesis & Habitability Characterization
Kepler-392 c is a confirmed terrestrial exoplanet orbiting the star Kepler-392, located approximately 2222.5 light-years (681.43 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.008% across the stellar disk), this world measures 1.1 Earth radii and has a measured mass of 1.37 Earth masses. Combining its mass and radius yields a mean bulk density of 5.68 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.13 g⊕ (11.08 m/s²), and an escape velocity of 12.5 km/s.
In its orbital architecture around Kepler-392, Kepler-392 c completes one full revolution every 10.423 Earth days at a semi-major axis of 0.093 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 97.1 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 901 K (+628°C / +1162°F) and receiving 185.10 S⊕ (~251,918 W/m²), Kepler-392 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-392 is classified as a stellar host with an effective photospheric temperature of 5,938 K, a radius of 1.129 R☉, a mass of 0.874 M☉, an estimated bolometric luminosity of 1.422 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.97 Gyr and a metallicity of [Fe/H] = -0.436 dex (metal-poor relative to the Sun). From Earth, Kepler-392 shines at apparent V-band magnitude 13.528 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-392 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-392 c sharing its stellar neighborhood alongside Kepler-392 b.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | Kepler-392 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,938 K |
| Stellar Radius | 1.1290 R☉ |
| Stellar Mass | 0.8740 M☉ |
| Bolometric Luminosity | 1.422 L☉ |
| Metallicity [Fe/H] | -0.436 dex |
| Stellar Age | 2.970 Gyr |
| Apparent Magnitude | V: 13.528 · G: 13.422 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.093000 AU |
| Orbital Period | 10.423 days |
| Mean Orbital Velocity | 97.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.7200° |
| Mean Bulk Density | 5.68 g/cm³ (12.5 km/s vesc) |
| Insolation Flux | 185.0980 S⊕ (~251,918 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2222.500 LY (681.428 pc) |