K2-352 d
Astrophysical Synthesis & Habitability Characterization
K2-352 d is a confirmed sub-neptune exoplanet orbiting the star K2-352, located approximately 574.2 light-years (176.05 parsecs) from the Solar System. First announced in 2021 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.0463% across the stellar disk), this world measures 2.23 Earth radii and has a measured mass of 5.6 Earth masses. Combining its mass and radius yields a mean bulk density of 2.78 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 K2-352, K2-352 d completes one full revolution every 14.871 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 727 K (+454°C / +849°F), K2-352 d orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star K2-352 is classified as a stellar host with an effective photospheric temperature of 5,791 K, a radius of 0.95 R☉, a mass of 0.98 M☉, an estimated bolometric luminosity of 0.911 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.05 dex (near-solar heavy-element abundance). From Earth, K2-352 shines at apparent V-band magnitude 11.125 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The K2-352 system is a multi-planet architecture hosting 3 confirmed worlds, with K2-352 d sharing its stellar neighborhood alongside K2-352 b, K2-352 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 | K2-352 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,791 K |
| Stellar Radius | 0.9500 R☉ |
| Stellar Mass | 0.9800 M☉ |
| Bolometric Luminosity | 0.911 L☉ |
| Metallicity [Fe/H] | -0.050 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 11.125 · G: 11.115 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 14.871 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.78 g/cm³ (17.7 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 574.200 LY (176.051 pc) |