Kepler-1959 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1959 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1959, located approximately 1563.1 light-years (479.26 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0167% across the stellar disk), this world measures 1.143 Earth radii and has a measured mass of 1.57 Earth masses. Combining its mass and radius yields a mean bulk density of 5.8 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.2 g⊕ (11.77 m/s²), and an escape velocity of 13.1 km/s.
In its orbital architecture around Kepler-1959, Kepler-1959 b completes one full revolution every 6.387 Earth days at a semi-major axis of 0.0617 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 105.1 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 811 K (+538°C / +1000°F) and receiving 102.25 S⊕ (~139,162 W/m²), Kepler-1959 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1959 is classified as a stellar host with an effective photospheric temperature of 5,071 K, a radius of 0.811 R☉, a mass of 0.768 M☉, an estimated bolometric luminosity of 0.39 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.02 dex (near-solar heavy-element abundance). From Earth, Kepler-1959 shines at apparent V-band magnitude 14.797 (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-1959 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,071 K |
| Stellar Radius | 0.8110 R☉ |
| Stellar Mass | 0.7680 M☉ |
| Bolometric Luminosity | 0.39 L☉ |
| Metallicity [Fe/H] | -0.020 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.797 · G: 14.557 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.061700 AU |
| Orbital Period | 6.387 days |
| Mean Orbital Velocity | 105.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9800° |
| Mean Bulk Density | 5.8 g/cm³ (13.1 km/s vesc) |
| Insolation Flux | 102.2500 S⊕ (~139,162 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1563.100 LY (479.263 pc) |