Kepler-200 c
Astrophysical Synthesis & Habitability Characterization
Kepler-200 c is a confirmed super-earth exoplanet orbiting the star Kepler-200, located approximately 2171.9 light-years (665.91 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0238% across the stellar disk), this world measures 1.59 Earth radii and has a measured mass of 3.15 Earth masses. Combining its mass and radius yields a mean bulk density of 4.32 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-200, Kepler-200 c completes one full revolution every 10.222 Earth days at a semi-major axis of 0.09 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 95.8 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 806 K (+533°C / +991°F) and receiving 126.36 S⊕ (~171,977 W/m²), Kepler-200 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-200 is classified as a stellar host with an effective photospheric temperature of 5,678 K, a radius of 0.944 R☉, a mass of 0.972 M☉, an estimated bolometric luminosity of 0.831 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.3 Gyr and a metallicity of [Fe/H] = -0.006 dex (near-solar heavy-element abundance). From Earth, Kepler-200 shines at apparent V-band magnitude 13.932 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-200 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-200 c sharing its stellar neighborhood alongside Kepler-200 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-200 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,678 K |
| Stellar Radius | 0.9440 R☉ |
| Stellar Mass | 0.9720 M☉ |
| Bolometric Luminosity | 0.831 L☉ |
| Metallicity [Fe/H] | -0.006 dex |
| Stellar Age | 6.300 Gyr |
| Apparent Magnitude | V: 13.932 · G: 13.952 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.090000 AU |
| Orbital Period | 10.222 days |
| Mean Orbital Velocity | 95.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.2300° |
| Mean Bulk Density | 4.32 g/cm³ (15.7 km/s vesc) |
| Insolation Flux | 126.3610 S⊕ (~171,977 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2171.900 LY (665.912 pc) |