Kepler-1956 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1956 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1956, located approximately 1175.7 light-years (360.47 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0214% across the stellar disk), this world measures 1.089 Earth radii and has a measured mass of 1.32 Earth masses. Combining its mass and radius yields a mean bulk density of 5.64 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.11 g⊕ (10.89 m/s²), and an escape velocity of 12.3 km/s.
In its orbital architecture around Kepler-1956, Kepler-1956 b completes one full revolution every 5.944 Earth days at a semi-major axis of 0.0563 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 103 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 674 K (+401°C / +754°F) and receiving 48.82 S⊕ (~66,444 W/m²), Kepler-1956 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1956 is classified as a stellar host with an effective photospheric temperature of 4,391 K, a radius of 0.682 R☉, a mass of 0.671 M☉, an estimated bolometric luminosity of 0.155 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-1956 shines at apparent V-band magnitude 15.989 (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-1956 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,391 K |
| Stellar Radius | 0.6820 R☉ |
| Stellar Mass | 0.6710 M☉ |
| Bolometric Luminosity | 0.155 L☉ |
| Metallicity [Fe/H] | 0.040 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 15.989 · G: 15.572 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.056300 AU |
| Orbital Period | 5.944 days |
| Mean Orbital Velocity | 103 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.5400° |
| Mean Bulk Density | 5.64 g/cm³ (12.3 km/s vesc) |
| Insolation Flux | 48.8200 S⊕ (~66,444 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1175.700 LY (360.468 pc) |