Kepler-113 c
Astrophysical Synthesis & Habitability Characterization
Kepler-113 c is a confirmed sub-neptune exoplanet orbiting the star Kepler-113, located approximately 855.7 light-years (262.35 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0839% across the stellar disk), this world measures 2.18 Earth radii and has a measured mass of 8.7 Earth masses. Combining its mass and radius yields a mean bulk density of 4.63 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.83 g⊕ (17.95 m/s²), and an escape velocity of 22.3 km/s.
In its orbital architecture around Kepler-113, Kepler-113 c completes one full revolution every 8.925 Earth days at a semi-major axis of 0.07796 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 95 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 628 K (+355°C / +671°F) and receiving 45.60 S⊕ (~62,056 W/m²), Kepler-113 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-113 is classified as a stellar host with an effective photospheric temperature of 4,725 K, a radius of 0.69 R☉, a mass of 0.75 M☉, an estimated bolometric luminosity of 0.213 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.89 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, Kepler-113 shines at apparent V-band magnitude 13.655 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-113 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-113 c sharing its stellar neighborhood alongside Kepler-113 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-113 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,725 K |
| Stellar Radius | 0.6900 R☉ |
| Stellar Mass | 0.7500 M☉ |
| Bolometric Luminosity | 0.213 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 6.890 Gyr |
| Apparent Magnitude | V: 13.655 · G: 13.460 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.077960 AU |
| Orbital Period | 8.925 days |
| Mean Orbital Velocity | 95 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.6900° |
| Mean Bulk Density | 4.63 g/cm³ (22.3 km/s vesc) |
| Insolation Flux | 45.5960 S⊕ (~62,056 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 855.700 LY (262.351 pc) |