K2-274 b
Astrophysical Synthesis & Habitability Characterization
K2-274 b is a confirmed sub-neptune exoplanet orbiting the star K2-274, located approximately 744.7 light-years (228.33 parsecs) from the Solar System. First announced in 2018 by K2 using the Transit detection technique (producing an estimated primary transit depth of 0.0742% across the stellar disk), this world measures 2.08 Earth radii and has a measured mass of 4.98 Earth masses. Combining its mass and radius yields a mean bulk density of 3.05 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.15 g⊕ (11.28 m/s²), and an escape velocity of 17.3 km/s.
In its orbital architecture around K2-274, K2-274 b completes one full revolution every 14.133 Earth days at a semi-major axis of 0.0964 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 74.2 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 655 K (+382°C / +720°F) and receiving 33.33 S⊕ (~45,360 W/m²), K2-274 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star K2-274 is classified as a stellar host with an effective photospheric temperature of 5,044 K, a radius of 0.7 R☉, a mass of 0.79 M☉, an estimated bolometric luminosity of 0.285 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.16 dex (metal-poor relative to the Sun). From Earth, K2-274 shines at apparent V-band magnitude 13.181 (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 | K2-274 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,044 K |
| Stellar Radius | 0.7000 R☉ |
| Stellar Mass | 0.7900 M☉ |
| Bolometric Luminosity | 0.285 L☉ |
| Metallicity [Fe/H] | -0.160 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 13.181 · G: 12.885 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.096400 AU |
| Orbital Period | 14.133 days |
| Mean Orbital Velocity | 74.2 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.4400° |
| Mean Bulk Density | 3.05 g/cm³ (17.3 km/s vesc) |
| Insolation Flux | 33.3287 S⊕ (~45,360 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 744.700 LY (228.327 pc) |