Kepler-1588 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1588 b is a confirmed sub-earth exoplanet orbiting the star Kepler-1588, located approximately 3014.1 light-years (924.14 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.005% across the stellar disk), this world measures 0.76 Earth radii and has a measured mass of 0.363 Earth masses. Combining its mass and radius yields a mean bulk density of 4.56 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.63 g⊕ (6.18 m/s²), and an escape velocity of 7.7 km/s.
In its orbital architecture around Kepler-1588, Kepler-1588 b completes one full revolution every 7.849 Earth days at a semi-major axis of 0.07419 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 102.8 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 925 K (+652°C / +1206°F) and receiving 359.79 S⊕ (~489,674 W/m²), Kepler-1588 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1588 is classified as a stellar host with an effective photospheric temperature of 5,817 K, a radius of 0.99 R☉, a mass of 0.96 M☉, an estimated bolometric luminosity of 1.007 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.5 Gyr and a metallicity of [Fe/H] = -0.14 dex (metal-poor relative to the Sun). From Earth, Kepler-1588 shines at apparent V-band magnitude 13.94 (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-1588 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,817 K |
| Stellar Radius | 0.9900 R☉ |
| Stellar Mass | 0.9600 M☉ |
| Bolometric Luminosity | 1.007 L☉ |
| Metallicity [Fe/H] | -0.140 dex |
| Stellar Age | 5.500 Gyr |
| Apparent Magnitude | V: 13.940 · G: 13.821 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.074190 AU |
| Orbital Period | 7.849 days |
| Mean Orbital Velocity | 102.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.6200° |
| Mean Bulk Density | 4.56 g/cm³ (7.7 km/s vesc) |
| Insolation Flux | 359.7900 S⊕ (~489,674 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3014.100 LY (924.141 pc) |