EPIC 206215704 b
Astrophysical Synthesis & Habitability Characterization
EPIC 206215704 b is a confirmed terrestrial exoplanet orbiting the star EPIC 206215704, located approximately 358.4 light-years (109.89 parsecs) from the Solar System. First announced in 2019 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.1345% across the stellar disk), this world measures 1 Earth radii and has a measured mass of 0.972 Earth masses. Combining its mass and radius yields a mean bulk density of 5.36 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.97 g⊕ (9.51 m/s²), and an escape velocity of 11 km/s.
In its orbital architecture around EPIC 206215704, EPIC 206215704 b completes one full revolution every 2.255 Earth days.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for EPIC 206215704 b place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star EPIC 206215704 is classified as a stellar host with an effective photospheric temperature of 3,297 K, a radius of 0.25 R☉, a mass of 0.407 M☉, an estimated bolometric luminosity of 0.00663 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.33 dex (metal-poor relative to the Sun). From Earth, EPIC 206215704 shines at apparent V-band magnitude 17.83 (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 | EPIC 206215704 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,297 K |
| Stellar Radius | 0.2500 R☉ |
| Stellar Mass | 0.4070 M☉ |
| Bolometric Luminosity | 0.00663 L☉ |
| Metallicity [Fe/H] | -0.330 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 17.830 · G: 16.172 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 2.255 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.9000° |
| Mean Bulk Density | 5.36 g/cm³ (11 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 358.400 LY (109.888 pc) |