Kepler-1907 c
Astrophysical Synthesis & Habitability Characterization
Kepler-1907 c is a confirmed terrestrial exoplanet orbiting the star Kepler-1907, located approximately 952.7 light-years (292.11 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0175% across the stellar disk), this world measures 1.155 Earth radii and has a measured mass of 1.63 Earth masses. Combining its mass and radius yields a mean bulk density of 5.83 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.22 g⊕ (11.96 m/s²), and an escape velocity of 13.3 km/s.
In its orbital architecture around Kepler-1907, Kepler-1907 c completes one full revolution every 14.864 Earth days at a semi-major axis of 0.10371 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 75.9 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 620 K (+347°C / +657°F) and receiving 20.60 S⊕ (~28,037 W/m²), Kepler-1907 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1907 is classified as a stellar host with an effective photospheric temperature of 5,159 K, a radius of 0.8 R☉, a mass of 0.752 M☉, an estimated bolometric luminosity of 0.407 L☉. Stellar evolution modeling indicates an estimated stellar age of 14 Gyr and a metallicity of [Fe/H] = -0.16 dex (metal-poor relative to the Sun). From Earth, Kepler-1907 shines at apparent V-band magnitude 13.989 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1907 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1907 c sharing its stellar neighborhood alongside Kepler-1907 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-1907 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,159 K |
| Stellar Radius | 0.8000 R☉ |
| Stellar Mass | 0.7520 M☉ |
| Bolometric Luminosity | 0.407 L☉ |
| Metallicity [Fe/H] | -0.160 dex |
| Stellar Age | 14.000 Gyr |
| Apparent Magnitude | V: 13.989 · G: 13.731 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.103710 AU |
| Orbital Period | 14.864 days |
| Mean Orbital Velocity | 75.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 84.2300° |
| Mean Bulk Density | 5.83 g/cm³ (13.3 km/s vesc) |
| Insolation Flux | 20.6000 S⊕ (~28,037 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 952.700 LY (292.111 pc) |