K2-384 d
Astrophysical Synthesis & Habitability Characterization
K2-384 d is a confirmed super-earth 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 0.1345% across the stellar disk), this world measures 1.392 Earth radii and has a measured mass of 2.52 Earth masses. Combining its mass and radius yields a mean bulk density of 5.15 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.3 g⊕ (12.75 m/s²), and an escape velocity of 15.1 km/s.
In its orbital architecture around K2-384, K2-384 d completes one full revolution every 6.68 Earth days.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for K2-384 d place it outside the conservative habitable zone definition pending further atmospheric characterization.
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 d sharing its stellar neighborhood alongside K2-384 b, K2-384 c, K2-384 e, K2-384 f.
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 | 6.68 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 5.15 g/cm³ (15.1 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 269.600 LY (82.660 pc) |