Kepler-1156 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1156 b is a confirmed super-earth exoplanet orbiting the star Kepler-1156, located approximately 2254.8 light-years (691.33 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0146% across the stellar disk), this world measures 1.32 Earth radii and has a measured mass of 2.3 Earth masses. Combining its mass and radius yields a mean bulk density of 5.51 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.32 g⊕ (12.94 m/s²), and an escape velocity of 14.8 km/s.
In its orbital architecture around Kepler-1156, Kepler-1156 b completes one full revolution every 11.895 Earth days at a semi-major axis of 0.09704 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 88.8 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 787 K (+514°C / +957°F) and receiving 83.01 S⊕ (~112,982 W/m²), Kepler-1156 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1156 is classified as a stellar host with an effective photospheric temperature of 5,778 K, a radius of 1 R☉, a mass of 1 M☉, an estimated bolometric luminosity of 1 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.47 Gyr and a metallicity of [Fe/H] = 0.02 dex (near-solar heavy-element abundance). From Earth, Kepler-1156 shines at apparent V-band magnitude 14.262 (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-1156 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,778 K |
| Stellar Radius | 1.0000 R☉ |
| Stellar Mass | 1.0000 M☉ |
| Bolometric Luminosity | 1 L☉ |
| Metallicity [Fe/H] | 0.020 dex |
| Stellar Age | 4.470 Gyr |
| Apparent Magnitude | V: 14.262 · G: 14.126 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.097040 AU |
| Orbital Period | 11.895 days |
| Mean Orbital Velocity | 88.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.8600° |
| Mean Bulk Density | 5.51 g/cm³ (14.8 km/s vesc) |
| Insolation Flux | 83.0140 S⊕ (~112,982 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2254.800 LY (691.331 pc) |