K2-368 d
Astrophysical Synthesis & Habitability Characterization
K2-368 d is a confirmed super-earth exoplanet orbiting the star K2-368, located approximately 673.9 light-years (206.61 parsecs) from the Solar System. First announced in 2022 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.0726% across the stellar disk), this world measures 1.948 Earth radii and has a measured mass of 4.45 Earth masses. Combining its mass and radius yields a mean bulk density of 3.32 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.17 g⊕ (11.47 m/s²), and an escape velocity of 16.9 km/s.
In its orbital architecture around K2-368, K2-368 d completes one full revolution every 20.201 Earth days.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for K2-368 d place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star K2-368 is classified as a stellar host with an effective photospheric temperature of 4,663 K, a radius of 0.663 R☉, a mass of 0.746 M☉, an estimated bolometric luminosity of 0.186 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.25 dex (metal-poor relative to the Sun). From Earth, K2-368 shines at apparent V-band magnitude 13.581 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The K2-368 system is a multi-planet architecture hosting 3 confirmed worlds, with K2-368 d sharing its stellar neighborhood alongside K2-368 b, K2-368 c.
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 | K2-368 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,663 K |
| Stellar Radius | 0.6630 R☉ |
| Stellar Mass | 0.7460 M☉ |
| Bolometric Luminosity | 0.186 L☉ |
| Metallicity [Fe/H] | -0.250 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 13.581 · G: 13.221 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 20.201 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3.32 g/cm³ (16.9 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 673.900 LY (206.608 pc) |