K2-333 b
Astrophysical Synthesis & Habitability Characterization
K2-333 b is a confirmed gas giant exoplanet orbiting the star K2-333, located approximately 1121.9 light-years (343.99 parsecs) from the Solar System. First announced in 2021 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.2157% across the stellar disk), this world measures 6.18 Earth radii (0.55 Jupiter radii) and has a measured mass of 31.6 Earth masses (0.1 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.74 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.83 g⊕ (8.14 m/s²), and an escape velocity of 25.3 km/s.
In its orbital architecture around K2-333, K2-333 b completes one full revolution every 14.759 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 826 K (+553°C / +1027°F) and receiving 102.13 S⊕ (~138,994 W/m²), K2-333 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star K2-333 is classified as a stellar host with an effective photospheric temperature of 5,880 K, a radius of 1.22 R☉, a mass of 1.06 M☉, an estimated bolometric luminosity of 1.596 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.07 dex (metal-rich relative to the Sun). From Earth, K2-333 shines at apparent V-band magnitude 12.073 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
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 | K2-333 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,880 K |
| Stellar Radius | 1.2200 R☉ |
| Stellar Mass | 1.0600 M☉ |
| Bolometric Luminosity | 1.596 L☉ |
| Metallicity [Fe/H] | 0.070 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 12.073 · G: 11.987 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 14.759 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.3500° |
| Mean Bulk Density | 0.74 g/cm³ (25.3 km/s vesc) |
| Insolation Flux | 102.1266 S⊕ (~138,994 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1121.900 LY (343.990 pc) |