Kepler-380 c
Astrophysical Synthesis & Habitability Characterization
Kepler-380 c is a confirmed super-earth exoplanet orbiting the star Kepler-380, located approximately 2654 light-years (813.71 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.009% across the stellar disk), this world measures 1.27 Earth radii and has a measured mass of 2.15 Earth masses. Combining its mass and radius yields a mean bulk density of 5.79 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.33 g⊕ (13.04 m/s²), and an escape velocity of 14.6 km/s.
In its orbital architecture around Kepler-380, Kepler-380 c completes one full revolution every 7.63 Earth days at a semi-major axis of 0.078 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 111.2 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 1056 K (+783°C / +1441°F) and receiving 333.57 S⊕ (~453,982 W/m²), Kepler-380 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-380 is classified as a stellar host with an effective photospheric temperature of 6,045 K, a radius of 1.224 R☉, a mass of 0.99 M☉, an estimated bolometric luminosity of 1.795 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.43 Gyr and a metallicity of [Fe/H] = -0.16 dex (metal-poor relative to the Sun). From Earth, Kepler-380 shines at apparent V-band magnitude 13.74 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-380 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-380 c sharing its stellar neighborhood alongside Kepler-380 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-380 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,045 K |
| Stellar Radius | 1.2240 R☉ |
| Stellar Mass | 0.9900 M☉ |
| Bolometric Luminosity | 1.795 L☉ |
| Metallicity [Fe/H] | -0.160 dex |
| Stellar Age | 4.430 Gyr |
| Apparent Magnitude | V: 13.740 · G: 13.611 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.078000 AU |
| Orbital Period | 7.63 days |
| Mean Orbital Velocity | 111.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.8400° |
| Mean Bulk Density | 5.79 g/cm³ (14.6 km/s vesc) |
| Insolation Flux | 333.5650 S⊕ (~453,982 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2654.000 LY (813.713 pc) |