Kepler-1911 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1911 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1911, located approximately 880.3 light-years (269.91 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0091% across the stellar disk), this world measures 1.011 Earth radii and has a measured mass of 1.01 Earth masses. Combining its mass and radius yields a mean bulk density of 5.39 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.99 g⊕ (9.71 m/s²), and an escape velocity of 11.2 km/s.
In its orbital architecture around Kepler-1911, Kepler-1911 b completes one full revolution every 5.991 Earth days at a semi-major axis of 0.0636 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 115.5 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 987 K (+714°C / +1317°F) and receiving 223.93 S⊕ (~304,769 W/m²), Kepler-1911 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1911 is classified as a stellar host with an effective photospheric temperature of 5,721 K, a radius of 0.972 R☉, a mass of 0.954 M☉, an estimated bolometric luminosity of 0.908 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, Kepler-1911 shines at apparent V-band magnitude 12.245 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
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-1911 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,721 K |
| Stellar Radius | 0.9720 R☉ |
| Stellar Mass | 0.9540 M☉ |
| Bolometric Luminosity | 0.908 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 12.245 · G: 12.112 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.063600 AU |
| Orbital Period | 5.991 days |
| Mean Orbital Velocity | 115.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 84.4200° |
| Mean Bulk Density | 5.39 g/cm³ (11.2 km/s vesc) |
| Insolation Flux | 223.9300 S⊕ (~304,769 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 880.300 LY (269.912 pc) |