EPIC 201833600 c
Astrophysical Synthesis & Habitability Characterization
EPIC 201833600 c is a confirmed terrestrial exoplanet orbiting the star K2-50, located approximately 839.7 light-years (257.44 parsecs) from the Solar System. First announced in 2019 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.0209% 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 K2-50, EPIC 201833600 c completes one full revolution every 3.962 Earth days.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for EPIC 201833600 c place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star K2-50 is classified as a stellar host with an effective photospheric temperature of 4,326 K, a radius of 0.634 R☉, a mass of 0.611 M☉, an estimated bolometric luminosity of 0.126 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.113 dex (metal-poor relative to the Sun). From Earth, K2-50 shines at apparent V-band magnitude 14.705 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The K2-50 system is a multi-planet architecture hosting 2 confirmed worlds, with EPIC 201833600 c sharing its stellar neighborhood alongside K2-50 b.
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 | K2-50 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,326 K |
| Stellar Radius | 0.6340 R☉ |
| Stellar Mass | 0.6110 M☉ |
| Bolometric Luminosity | 0.126 L☉ |
| Metallicity [Fe/H] | -0.113 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.705 · G: 14.258 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 3.962 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 5.36 g/cm³ (11 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 839.700 LY (257.443 pc) |