K2-200 b
Astrophysical Synthesis & Habitability Characterization
K2-200 b is a confirmed super-earth exoplanet orbiting the star K2-200, located approximately 600.6 light-years (184.13 parsecs) from the Solar System. First announced in 2018 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.0249% across the stellar disk), this world measures 1.364 Earth radii and has a measured mass of 2.43 Earth masses. Combining its mass and radius yields a mean bulk density of 5.28 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.31 g⊕ (12.85 m/s²), and an escape velocity of 14.9 km/s.
In its orbital architecture around K2-200, K2-200 b completes one full revolution every 2.85 Earth days.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for K2-200 b place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star K2-200 is classified as a stellar host with an effective photospheric temperature of 5,233 K, a radius of 0.7917 R☉, a mass of 0.8602 M☉, an estimated bolometric luminosity of 0.422 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.04 dex (near-solar heavy-element abundance). From Earth, K2-200 shines at apparent V-band magnitude 12.428 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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: K2 · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | K2-200 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,233 K |
| Stellar Radius | 0.7917 R☉ |
| Stellar Mass | 0.8602 M☉ |
| Bolometric Luminosity | 0.422 L☉ |
| Metallicity [Fe/H] | -0.040 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 12.428 · G: 12.232 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 2.85 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 87.9677° |
| Mean Bulk Density | 5.28 g/cm³ (14.9 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 600.600 LY (184.131 pc) |