Kepler-2000 c
Astrophysical Synthesis & Habitability Characterization
Kepler-2000 c is a confirmed super-earth exoplanet orbiting the star Kepler-2000, located approximately 1045.6 light-years (320.59 parsecs) from the Solar System. First announced in 2023 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0624% across the stellar disk), this world measures 1.57 Earth radii and has a measured mass of 3.09 Earth masses. Combining its mass and radius yields a mean bulk density of 4.4 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-2000, Kepler-2000 c completes one full revolution every 20.618 Earth days at a semi-major axis of 0.1228 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 64.8 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 359 K (+86°C / +187°F) and receiving 3.92 S⊕ (~5,335 W/m²), Kepler-2000 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-2000 is classified as a stellar host with an effective photospheric temperature of 3,757 K, a radius of 0.576 R☉, a mass of 0.581 M☉, an estimated bolometric luminosity of 0.059 L☉. Stellar evolution modeling indicates an estimated stellar age of 6 Gyr and a metallicity of [Fe/H] = 0.48 dex (metal-rich relative to the Sun). From Earth, Kepler-2000 shines at apparent V-band magnitude 15.642 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-2000 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-2000 c sharing its stellar neighborhood alongside Kepler-2000 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-2000 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,757 K |
| Stellar Radius | 0.5760 R☉ |
| Stellar Mass | 0.5810 M☉ |
| Bolometric Luminosity | 0.059 L☉ |
| Metallicity [Fe/H] | 0.480 dex |
| Stellar Age | 6.000 Gyr |
| Apparent Magnitude | V: 15.642 · G: 15.264 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.122800 AU |
| Orbital Period | 20.618 days |
| Mean Orbital Velocity | 64.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.8200° |
| Mean Bulk Density | 4.4 g/cm³ (15.7 km/s vesc) |
| Insolation Flux | 3.9200 S⊕ (~5,335 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1045.600 LY (320.588 pc) |