Kepler-1199 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1199 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1199, located approximately 1837.9 light-years (563.49 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0081% across the stellar disk), this world measures 1.15 Earth radii and has a measured mass of 1.6 Earth masses. Combining its mass and radius yields a mean bulk density of 5.8 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.21 g⊕ (11.87 m/s²), and an escape velocity of 13.2 km/s.
In its orbital architecture around Kepler-1199, Kepler-1199 b completes one full revolution every 15.045 Earth days at a semi-major axis of 0.11309 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 81.8 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 931 K (+658°C / +1216°F) and receiving 131.70 S⊕ (~179,244 W/m²), Kepler-1199 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1199 is classified as a stellar host with an effective photospheric temperature of 5,889 K, a radius of 1.17 R☉, a mass of 0.94 M☉, an estimated bolometric luminosity of 1.477 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.76 Gyr and a metallicity of [Fe/H] = -0.27 dex (metal-poor relative to the Sun). From Earth, Kepler-1199 shines at apparent V-band magnitude 13.173 (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-1199 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,889 K |
| Stellar Radius | 1.1700 R☉ |
| Stellar Mass | 0.9400 M☉ |
| Bolometric Luminosity | 1.477 L☉ |
| Metallicity [Fe/H] | -0.270 dex |
| Stellar Age | 7.760 Gyr |
| Apparent Magnitude | V: 13.173 · G: 13.030 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.113090 AU |
| Orbital Period | 15.045 days |
| Mean Orbital Velocity | 81.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9400° |
| Mean Bulk Density | 5.8 g/cm³ (13.2 km/s vesc) |
| Insolation Flux | 131.7000 S⊕ (~179,244 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1837.900 LY (563.493 pc) |