K2-213 b
Astrophysical Synthesis & Habitability Characterization
K2-213 b is a confirmed super-earth exoplanet orbiting the star K2-213, located approximately 1271 light-years (389.7 parsecs) from the Solar System. First announced in 2018 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.0133% across the stellar disk), this world measures 1.514 Earth radii and has a measured mass of 2.9 Earth masses. Combining its mass and radius yields a mean bulk density of 4.61 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.27 g⊕ (12.45 m/s²), and an escape velocity of 15.5 km/s.
In its orbital architecture around K2-213, K2-213 b completes one full revolution every 8.131 Earth days.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for K2-213 b place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star K2-213 is classified as a stellar host with an effective photospheric temperature of 5,794 K, a radius of 1.2042 R☉, a mass of 1.0696 M☉, an estimated bolometric luminosity of 1.466 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.25 dex (metal-rich relative to the Sun). From Earth, K2-213 shines at apparent V-band magnitude 11.803 (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: K2 · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | K2-213 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,794 K |
| Stellar Radius | 1.2042 R☉ |
| Stellar Mass | 1.0696 M☉ |
| Bolometric Luminosity | 1.466 L☉ |
| Metallicity [Fe/H] | 0.250 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 11.803 · G: 12.041 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 8.131 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 87.8616° |
| Mean Bulk Density | 4.61 g/cm³ (15.5 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1271.000 LY (389.702 pc) |