K2-384 f
Astrophysical Synthesis & Habitability Characterization
K2-384 f is a confirmed sub-neptune exoplanet orbiting the star K2-384, located approximately 269.6 light-years (82.66 parsecs) from the Solar System. First announced in 2022 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.3427% across the stellar disk), this world measures 2.222 Earth radii and has a measured mass of 5.57 Earth masses. Combining its mass and radius yields a mean bulk density of 2.8 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.13 g⊕ (11.08 m/s²), and an escape velocity of 17.7 km/s.
In its orbital architecture around K2-384, K2-384 f completes one full revolution every 13.627 Earth days.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 2.222 R⊕, K2-384 f exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star K2-384 is classified as a low-mass red dwarf of spectral type M4 V with an effective photospheric temperature of 3,623 K, a radius of 0.348 R☉, a mass of 0.33 M☉, an estimated bolometric luminosity of 0.019 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.068 dex (metal-rich relative to the Sun). From Earth, K2-384 shines at apparent V-band magnitude 16.12 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The K2-384 system is a multi-planet architecture hosting 5 confirmed worlds, with K2-384 f sharing its stellar neighborhood alongside K2-384 b, K2-384 c, K2-384 d, K2-384 e.
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 | K2-384 |
| Spectral Type | M4 V |
| Effective Temp (Teff) | 3,623 K |
| Stellar Radius | 0.3480 R☉ |
| Stellar Mass | 0.3300 M☉ |
| Bolometric Luminosity | 0.019 L☉ |
| Metallicity [Fe/H] | 0.068 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 16.120 · G: 15.028 |
| System Architecture | 1 Star, 5 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 13.627 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.8 g/cm³ (17.7 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 269.600 LY (82.660 pc) |