K2-411 b
Astrophysical Synthesis & Habitability Characterization
K2-411 b is a confirmed terrestrial exoplanet orbiting the star K2-411, located approximately 972.7 light-years (298.22 parsecs) from the Solar System. First announced in 2022 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.0044% across the stellar disk), this world measures 0.99 Earth radii and has a measured mass of 0.937 Earth masses. Combining its mass and radius yields a mean bulk density of 5.32 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.96 g⊕ (9.41 m/s²), and an escape velocity of 10.9 km/s.
In its orbital architecture around K2-411, K2-411 b completes one full revolution every 3.214 Earth days at a semi-major axis of 0.0511 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 173 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1429 K (+1156°C / +2113°F) and receiving 619.04 S⊕ (~842,511 W/m²), K2-411 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star K2-411 is classified as a stellar host with an effective photospheric temperature of 5,711 K, a radius of 1.375 R☉, a mass of 1.018 M☉, an estimated bolometric luminosity of 1.804 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.142 dex (metal-rich relative to the Sun). From Earth, K2-411 shines at apparent V-band magnitude 12.27 (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 | K2-411 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,711 K |
| Stellar Radius | 1.3750 R☉ |
| Stellar Mass | 1.0180 M☉ |
| Bolometric Luminosity | 1.804 L☉ |
| Metallicity [Fe/H] | 0.142 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 12.270 · G: 11.987 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.051100 AU |
| Orbital Period | 3.214 days |
| Mean Orbital Velocity | 173 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 90.0008° |
| Mean Bulk Density | 5.32 g/cm³ (10.9 km/s vesc) |
| Insolation Flux | 619.0380 S⊕ (~842,511 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 972.700 LY (298.219 pc) |