Kepler-270 b
Astrophysical Synthesis & Habitability Characterization
Kepler-270 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-270, located approximately 3094.5 light-years (948.78 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0159% across the stellar disk), this world measures 2.01 Earth radii and has a measured mass of 4.7 Earth masses. Combining its mass and radius yields a mean bulk density of 3.19 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.16 g⊕ (11.38 m/s²), and an escape velocity of 17.1 km/s.
In its orbital architecture around Kepler-270, Kepler-270 b completes one full revolution every 11.476 Earth days at a semi-major axis of 0.107 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 101.4 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 984 K (+711°C / +1312°F) and receiving 178.36 S⊕ (~242,751 W/m²), Kepler-270 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-270 is classified as a stellar host with an effective photospheric temperature of 6,067 K, a radius of 1.461 R☉, a mass of 1.17 M☉, an estimated bolometric luminosity of 2.595 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.73 Gyr and a metallicity of [Fe/H] = 0.15 dex (metal-rich relative to the Sun). From Earth, Kepler-270 shines at apparent V-band magnitude 13.9 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-270 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-270 b sharing its stellar neighborhood alongside Kepler-270 c.
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-270 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,067 K |
| Stellar Radius | 1.4610 R☉ |
| Stellar Mass | 1.1700 M☉ |
| Bolometric Luminosity | 2.595 L☉ |
| Metallicity [Fe/H] | 0.150 dex |
| Stellar Age | 2.730 Gyr |
| Apparent Magnitude | V: 13.900 · G: 13.859 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.107000 AU |
| Orbital Period | 11.476 days |
| Mean Orbital Velocity | 101.4 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.3300° |
| Mean Bulk Density | 3.19 g/cm³ (17.1 km/s vesc) |
| Insolation Flux | 178.3620 S⊕ (~242,751 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3094.500 LY (948.781 pc) |