Kepler-111 b
Astrophysical Synthesis & Habitability Characterization
Kepler-111 b is a confirmed super-earth exoplanet orbiting the star Kepler-111, located approximately 2143.6 light-years (657.22 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0157% across the stellar disk), this world measures 1.58 Earth radii and has a measured mass of 3.12 Earth masses. Combining its mass and radius yields a mean bulk density of 4.36 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.25 g⊕ (12.26 m/s²), and an escape velocity of 15.7 km/s.
In its orbital architecture around Kepler-111, Kepler-111 b completes one full revolution every 3.342 Earth days at a semi-major axis of 0.046 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 149.8 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 1356 K (+1083°C / +1981°F) and receiving 677.50 S⊕ (~922,082 W/m²), Kepler-111 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-111 is classified as a stellar host with an effective photospheric temperature of 5,952 K, a radius of 1.157 R☉, a mass of 1.171 M☉, an estimated bolometric luminosity of 1.507 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.3 Gyr and a metallicity of [Fe/H] = 0.22 dex (metal-rich relative to the Sun). From Earth, Kepler-111 shines at apparent V-band magnitude 13.543 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-111 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-111 b sharing its stellar neighborhood alongside Kepler-111 c.
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-111 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,952 K |
| Stellar Radius | 1.1570 R☉ |
| Stellar Mass | 1.1710 M☉ |
| Bolometric Luminosity | 1.507 L☉ |
| Metallicity [Fe/H] | 0.220 dex |
| Stellar Age | 2.300 Gyr |
| Apparent Magnitude | V: 13.543 · G: 13.419 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.046000 AU |
| Orbital Period | 3.342 days |
| Mean Orbital Velocity | 149.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.9600° |
| Mean Bulk Density | 4.36 g/cm³ (15.7 km/s vesc) |
| Insolation Flux | 677.5030 S⊕ (~922,082 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2143.600 LY (657.223 pc) |