Kepler-370 c
Astrophysical Synthesis & Habitability Characterization
Kepler-370 c is a confirmed super-earth exoplanet orbiting the star Kepler-370, located approximately 3809.3 light-years (1167.94 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0379% across the stellar disk), this world measures 1.91 Earth radii and has a measured mass of 4.31 Earth masses. Combining its mass and radius yields a mean bulk density of 3.41 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.18 g⊕ (11.57 m/s²), and an escape velocity of 16.8 km/s.
In its orbital architecture around Kepler-370, Kepler-370 c completes one full revolution every 19.023 Earth days at a semi-major axis of 0.14 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 80.1 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 647 K (+374°C / +705°F) and receiving 54.20 S⊕ (~73,762 W/m²), Kepler-370 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-370 is classified as a stellar host with an effective photospheric temperature of 5,852 K, a radius of 0.9 R☉, a mass of 0.982 M☉, an estimated bolometric luminosity of 0.852 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.03 Gyr and a metallicity of [Fe/H] = 0.132 dex (metal-rich relative to the Sun). From Earth, Kepler-370 shines at apparent V-band magnitude 15.467 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-370 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-370 c sharing its stellar neighborhood alongside Kepler-370 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-370 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,852 K |
| Stellar Radius | 0.9000 R☉ |
| Stellar Mass | 0.9820 M☉ |
| Bolometric Luminosity | 0.852 L☉ |
| Metallicity [Fe/H] | 0.132 dex |
| Stellar Age | 6.030 Gyr |
| Apparent Magnitude | V: 15.467 · G: 15.160 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.140000 AU |
| Orbital Period | 19.023 days |
| Mean Orbital Velocity | 80.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.7300° |
| Mean Bulk Density | 3.41 g/cm³ (16.8 km/s vesc) |
| Insolation Flux | 54.1970 S⊕ (~73,762 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3809.300 LY (1167.940 pc) |