Kepler-1672 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1672 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1672, located approximately 1275.9 light-years (391.18 parsecs) from the Solar System. First announced in 2020 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0626% across the stellar disk), this world measures 2.97 Earth radii and has a measured mass of 9.11 Earth masses. Combining its mass and radius yields a mean bulk density of 1.92 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.03 g⊕ (10.1 m/s²), and an escape velocity of 19.6 km/s.
In its orbital architecture around Kepler-1672, Kepler-1672 b completes one full revolution every 150.878 Earth days at a semi-major axis of 0.55374 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 39.9 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 423 K (+150°C / +302°F) and receiving 4.40 S⊕ (~5,988 W/m²), Kepler-1672 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1672 is classified as a stellar host with an effective photospheric temperature of 6,132 K, a radius of 1.0884 R☉, a mass of 1.16 M☉, an estimated bolometric luminosity of 1.503 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.19 Gyr and a metallicity of [Fe/H] = -0.25 dex (metal-poor relative to the Sun). From Earth, Kepler-1672 shines at apparent V-band magnitude 12.548 (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-1672 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,132 K |
| Stellar Radius | 1.0884 R☉ |
| Stellar Mass | 1.1600 M☉ |
| Bolometric Luminosity | 1.503 L☉ |
| Metallicity [Fe/H] | -0.250 dex |
| Stellar Age | 4.190 Gyr |
| Apparent Magnitude | V: 12.548 · G: 12.396 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.553740 AU |
| Orbital Period | 150.878 days |
| Mean Orbital Velocity | 39.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9900° |
| Mean Bulk Density | 1.92 g/cm³ (19.6 km/s vesc) |
| Insolation Flux | 4.4000 S⊕ (~5,988 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1275.900 LY (391.181 pc) |