Kepler-1536 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1536 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1536, located approximately 1263 light-years (387.25 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.1846% across the stellar disk), this world measures 3.14 Earth radii (0.28 Jupiter radii) and has a measured mass of 10 Earth masses. Combining its mass and radius yields a mean bulk density of 1.78 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.01 g⊕ (9.9 m/s²), and an escape velocity of 20 km/s.
In its orbital architecture around Kepler-1536, Kepler-1536 b completes one full revolution every 364.758 Earth days at a semi-major axis of 0.8507 AU (comparable to the inner terrestrial zone between Venus, Earth at 1.00 AU, and Mars at 1.52 AU). Its mean orbital velocity is approximately 25.4 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 (Cryogenic Zone): With an equilibrium temperature of 166 K (-107°C / -161°F) and an incident flux of 0.19 S⊕ (~263 W/m²), surface water and volatile species on Kepler-1536 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star Kepler-1536 is classified as a stellar host with an effective photospheric temperature of 4,434 K, a radius of 0.67 R☉, a mass of 0.71 M☉, an estimated bolometric luminosity of 0.156 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.95 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, Kepler-1536 shines at apparent V-band magnitude 15.464 (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-1536 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,434 K |
| Stellar Radius | 0.6700 R☉ |
| Stellar Mass | 0.7100 M☉ |
| Bolometric Luminosity | 0.156 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 2.950 Gyr |
| Apparent Magnitude | V: 15.464 · G: 15.141 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.850700 AU |
| Orbital Period | 364.758 days |
| Mean Orbital Velocity | 25.4 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.5900° |
| Mean Bulk Density | 1.78 g/cm³ (20 km/s vesc) |
| Insolation Flux | 0.1930 S⊕ (~263 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1263.000 LY (387.248 pc) |