Kepler-1207 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1207 b is a confirmed super-earth exoplanet orbiting the star Kepler-1207, located approximately 5721.4 light-years (1754.19 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0196% across the stellar disk), this world measures 1.62 Earth radii and has a measured mass of 3.26 Earth masses. Combining its mass and radius yields a mean bulk density of 4.23 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.24 g⊕ (12.16 m/s²), and an escape velocity of 15.9 km/s.
In its orbital architecture around Kepler-1207, Kepler-1207 b completes one full revolution every 13.682 Earth days at a semi-major axis of 0.1156 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 91.9 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 802 K (+529°C / +984°F) and receiving 352.51 S⊕ (~479,763 W/m²), Kepler-1207 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1207 is classified as a stellar host with an effective photospheric temperature of 5,909 K, a radius of 1.06 R☉, a mass of 1.06 M☉, an estimated bolometric luminosity of 1.229 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.63 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, Kepler-1207 shines at apparent V-band magnitude 14.595 (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-1207 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,909 K |
| Stellar Radius | 1.0600 R☉ |
| Stellar Mass | 1.0600 M☉ |
| Bolometric Luminosity | 1.229 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 3.630 Gyr |
| Apparent Magnitude | V: 14.595 · G: 14.449 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.115600 AU |
| Orbital Period | 13.682 days |
| Mean Orbital Velocity | 91.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.3500° |
| Mean Bulk Density | 4.23 g/cm³ (15.9 km/s vesc) |
| Insolation Flux | 352.5080 S⊕ (~479,763 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 5721.400 LY (1754.190 pc) |