Kepler-148 b
Astrophysical Synthesis & Habitability Characterization
Kepler-148 b is a confirmed super-earth exoplanet orbiting the star Kepler-148, located approximately 2580.4 light-years (791.16 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0376% across the stellar disk), this world measures 1.8 Earth radii and has a measured mass of 3.89 Earth masses. Combining its mass and radius yields a mean bulk density of 3.68 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.2 g⊕ (11.77 m/s²), and an escape velocity of 16.4 km/s.
In its orbital architecture around Kepler-148, Kepler-148 b completes one full revolution every 1.729 Earth days at a semi-major axis of 0.028 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 176.1 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 1284 K (+1011°C / +1852°F) and receiving 609.02 S⊕ (~828,872 W/m²), Kepler-148 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-148 is classified as a stellar host with an effective photospheric temperature of 5,272 K, a radius of 0.851 R☉, a mass of 0.86 M☉, an estimated bolometric luminosity of 0.502 L☉. Stellar evolution modeling indicates an estimated stellar age of 11.2 Gyr and a metallicity of [Fe/H] = 0.14 dex (metal-rich relative to the Sun). From Earth, Kepler-148 shines at apparent V-band magnitude 15.398 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-148 system is a multi-planet architecture hosting 3 confirmed worlds, with Kepler-148 b sharing its stellar neighborhood alongside Kepler-148 c, Kepler-148 d.
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-148 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,272 K |
| Stellar Radius | 0.8510 R☉ |
| Stellar Mass | 0.8600 M☉ |
| Bolometric Luminosity | 0.502 L☉ |
| Metallicity [Fe/H] | 0.140 dex |
| Stellar Age | 11.200 Gyr |
| Apparent Magnitude | V: 15.398 · G: 15.336 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.028000 AU |
| Orbital Period | 1.729 days |
| Mean Orbital Velocity | 176.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.8700° |
| Mean Bulk Density | 3.68 g/cm³ (16.4 km/s vesc) |
| Insolation Flux | 609.0170 S⊕ (~828,872 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2580.400 LY (791.163 pc) |