EPIC 201841433 b
Astrophysical Synthesis & Habitability Characterization
EPIC 201841433 b is a confirmed terrestrial exoplanet orbiting the star EPIC 201841433, located approximately 1423.6 light-years (436.49 parsecs) from the Solar System. First announced in 2019 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.023% across the stellar disk), this world measures 1.04 Earth radii and has a measured mass of 1.12 Earth masses. Combining its mass and radius yields a mean bulk density of 5.49 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.04 g⊕ (10.2 m/s²), and an escape velocity of 11.6 km/s.
In its orbital architecture around EPIC 201841433, EPIC 201841433 b completes one full revolution every 4.17 Earth days at a semi-major axis of 0.035 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 91.3 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1032 K (+759°C / +1398°F) and receiving 189.37 S⊕ (~257,733 W/m²), EPIC 201841433 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star EPIC 201841433 is classified as a stellar host with an effective photospheric temperature of 5,053 K, a radius of 0.6285 R☉, a mass of 0.802 M☉, an estimated bolometric luminosity of 0.231 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, EPIC 201841433 shines at apparent V-band magnitude 14.983 (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 | EPIC 201841433 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,053 K |
| Stellar Radius | 0.6285 R☉ |
| Stellar Mass | 0.8020 M☉ |
| Bolometric Luminosity | 0.231 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.983 · G: 14.589 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.035000 AU |
| Orbital Period | 4.17 days |
| Mean Orbital Velocity | 91.3 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.0010° |
| Mean Bulk Density | 5.49 g/cm³ (11.6 km/s vesc) |
| Insolation Flux | 189.3706 S⊕ (~257,733 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1423.600 LY (436.488 pc) |