Kepler-394 c
Astrophysical Synthesis & Habitability Characterization
Kepler-394 c is a confirmed super-earth exoplanet orbiting the star Kepler-394, located approximately 3453.1 light-years (1058.72 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0181% across the stellar disk), this world measures 1.66 Earth radii and has a measured mass of 3.39 Earth masses. Combining its mass and radius yields a mean bulk density of 4.09 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.23 g⊕ (12.06 m/s²), and an escape velocity of 16 km/s.
In its orbital architecture around Kepler-394, Kepler-394 c completes one full revolution every 12.131 Earth days at a semi-major axis of 0.11 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 98.7 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 901 K (+628°C / +1162°F) and receiving 94.53 S⊕ (~128,653 W/m²), Kepler-394 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-394 is classified as a stellar host with an effective photospheric temperature of 6,402 K, a radius of 1.132 R☉, a mass of 0.87 M☉, an estimated bolometric luminosity of 1.931 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.25 Gyr and a metallicity of [Fe/H] = -0.3 dex (metal-poor relative to the Sun). From Earth, Kepler-394 shines at apparent V-band magnitude 14.948 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-394 system is a multi-planet architecture hosting 3 confirmed worlds, with Kepler-394 c sharing its stellar neighborhood alongside Kepler-394 d, Kepler-394 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-394 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,402 K |
| Stellar Radius | 1.1320 R☉ |
| Stellar Mass | 0.8700 M☉ |
| Bolometric Luminosity | 1.931 L☉ |
| Metallicity [Fe/H] | -0.300 dex |
| Stellar Age | 0.250 Gyr |
| Apparent Magnitude | V: 14.948 · G: 14.770 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.110000 AU |
| Orbital Period | 12.131 days |
| Mean Orbital Velocity | 98.7 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.8000° |
| Mean Bulk Density | 4.09 g/cm³ (16 km/s vesc) |
| Insolation Flux | 94.5280 S⊕ (~128,653 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3453.100 LY (1058.720 pc) |