Kepler-59 b
Astrophysical Synthesis & Habitability Characterization
Kepler-59 b is a confirmed terrestrial exoplanet orbiting the star Kepler-59, located approximately 3793.9 light-years (1163.22 parsecs) from the Solar System. First announced in 2012 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0115% across the stellar disk), this world measures 1.1 Earth radii and has a measured mass of 4.1 Earth masses. Combining its mass and radius yields a mean bulk density of 16.99 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 3.39 g⊕ (33.24 m/s²), and an escape velocity of 21.6 km/s.
In its orbital architecture around Kepler-59, Kepler-59 b completes one full revolution every 11.868 Earth days at a semi-major axis of 0.09943 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 91.1 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 864 K (+591°C / +1096°F) and receiving 187.51 S⊕ (~255,201 W/m²), Kepler-59 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-59 is classified as a stellar host with an effective photospheric temperature of 6,074 K, a radius of 0.94 R☉, a mass of 1.04 M☉, an estimated bolometric luminosity of 1.079 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.26 Gyr and a metallicity of [Fe/H] = -0.2 dex (metal-poor relative to the Sun). From Earth, Kepler-59 shines at apparent V-band magnitude 14.467 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-59 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-59 b sharing its stellar neighborhood alongside Kepler-59 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-59 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,074 K |
| Stellar Radius | 0.9400 R☉ |
| Stellar Mass | 1.0400 M☉ |
| Bolometric Luminosity | 1.079 L☉ |
| Metallicity [Fe/H] | -0.200 dex |
| Stellar Age | 0.260 Gyr |
| Apparent Magnitude | V: 14.467 · G: 14.279 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.099430 AU |
| Orbital Period | 11.868 days |
| Mean Orbital Velocity | 91.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.9300° |
| Mean Bulk Density | 16.99 g/cm³ (21.6 km/s vesc) |
| Insolation Flux | 187.5100 S⊕ (~255,201 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3793.900 LY (1163.220 pc) |