Kepler-1674 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1674 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1674, located approximately 3302.3 light-years (1012.48 parsecs) from the Solar System. First announced in 2020 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.1122% across the stellar disk), this world measures 3.206 Earth radii (0.29 Jupiter radii) and has a measured mass of 10.4 Earth masses. Combining its mass and radius yields a mean bulk density of 1.74 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.01 g⊕ (9.9 m/s²), and an escape velocity of 20.1 km/s.
In its orbital architecture around Kepler-1674, Kepler-1674 b completes one full revolution every 62.561 Earth days at a semi-major axis of 0.3017 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 52.5 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 417 K (+144°C / +291°F) and receiving 7.13 S⊕ (~9,704 W/m²), Kepler-1674 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1674 is classified as a stellar host with an effective photospheric temperature of 5,474 K, a radius of 0.8773 R☉, a mass of 0.96 M☉, an estimated bolometric luminosity of 0.62 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.5 Gyr and a metallicity of [Fe/H] = 0.056 dex (metal-rich relative to the Sun). From Earth, Kepler-1674 shines at apparent V-band magnitude 15.697 (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: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | Kepler-1674 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,474 K |
| Stellar Radius | 0.8773 R☉ |
| Stellar Mass | 0.9600 M☉ |
| Bolometric Luminosity | 0.62 L☉ |
| Metallicity [Fe/H] | 0.056 dex |
| Stellar Age | 0.500 Gyr |
| Apparent Magnitude | V: 15.697 · G: 15.478 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.301700 AU |
| Orbital Period | 62.561 days |
| Mean Orbital Velocity | 52.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.0200° |
| Mean Bulk Density | 1.74 g/cm³ (20.1 km/s vesc) |
| Insolation Flux | 7.1300 S⊕ (~9,704 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3302.300 LY (1012.480 pc) |