EPIC 212297394 c
Astrophysical Synthesis & Habitability Characterization
EPIC 212297394 c is a confirmed sub-neptune exoplanet orbiting the star EPIC 212297394, located approximately 1364.6 light-years (418.4 parsecs) from the Solar System. First announced in 2021 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.0677% across the stellar disk), this world measures 2.27 Earth radii and has a measured mass of 5.77 Earth masses. Combining its mass and radius yields a mean bulk density of 2.72 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.12 g⊕ (10.98 m/s²), and an escape velocity of 17.8 km/s.
In its orbital architecture around EPIC 212297394, EPIC 212297394 c completes one full revolution every 5.214 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 866 K (+593°C / +1099°F), EPIC 212297394 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star EPIC 212297394 is classified as a stellar host with an effective photospheric temperature of 5,171 K, a radius of 0.8 R☉, a mass of 0.83 M☉, an estimated bolometric luminosity of 0.411 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.03 dex (near-solar heavy-element abundance). From Earth, EPIC 212297394 shines at apparent V-band magnitude 14.611 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The EPIC 212297394 system is a multi-planet architecture hosting 2 confirmed worlds, with EPIC 212297394 c sharing its stellar neighborhood alongside EPIC 212297394 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 | EPIC 212297394 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,171 K |
| Stellar Radius | 0.8000 R☉ |
| Stellar Mass | 0.8300 M☉ |
| Bolometric Luminosity | 0.411 L☉ |
| Metallicity [Fe/H] | -0.030 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.611 · G: 14.186 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 5.214 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.72 g/cm³ (17.8 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1364.600 LY (418.395 pc) |