K2-210 b
Astrophysical Synthesis & Habitability Characterization
K2-210 b is a confirmed terrestrial exoplanet orbiting the star K2-210, located approximately 575.7 light-years (176.51 parsecs) from the Solar System. First announced in 2018 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.0078% across the stellar disk), this world measures 0.86 Earth radii and has a measured mass of 0.566 Earth masses. Combining its mass and radius yields a mean bulk density of 4.91 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.77 g⊕ (7.55 m/s²), and an escape velocity of 9.1 km/s.
In its orbital architecture around K2-210, K2-210 b completes one full revolution every 0.57 Earth days.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for K2-210 b place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star K2-210 is classified as a stellar host with an effective photospheric temperature of 5,500 K, a radius of 0.89 R☉, a mass of 0.9117 M☉, an estimated bolometric luminosity of 0.65 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, K2-210 shines at apparent V-band magnitude 11.535 (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 | K2-210 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,500 K |
| Stellar Radius | 0.8900 R☉ |
| Stellar Mass | 0.9117 M☉ |
| Bolometric Luminosity | 0.65 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 11.535 · G: 11.585 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 0.57 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.2000° |
| Mean Bulk Density | 4.91 g/cm³ (9.1 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 575.700 LY (176.510 pc) |