KELT-10 b
Astrophysical Synthesis & Habitability Characterization
KELT-10 b is a confirmed gas giant exoplanet orbiting the star KELT-10, located approximately 614.5 light-years (188.4 parsecs) from the Solar System. First announced in 2016 by KELT-South using the Transit detection technique (producing an estimated primary transit depth of 1.414% across the stellar disk), this world measures 15.681 Earth radii (1.4 Jupiter radii) and has a measured mass of 215.807 Earth masses (0.68 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.31 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.88 g⊕ (8.63 m/s²), and an escape velocity of 41.5 km/s.
In its orbital architecture around KELT-10, KELT-10 b completes one full revolution every 4.166 Earth days at a semi-major axis of 0.0525 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 137.1 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1377 K (+1104°C / +2019°F) and receiving 600.00 S⊕ (~816,600 W/m²), KELT-10 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star KELT-10 is classified as a solar-type yellow star of spectral type G0 V with an effective photospheric temperature of 5,948 K, a radius of 1.209 R☉, a mass of 1.112 M☉, an estimated bolometric luminosity of 1.641 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.5 Gyr and a metallicity of [Fe/H] = 0.09 dex (metal-rich relative to the Sun). From Earth, KELT-10 shines at apparent V-band magnitude 10.617 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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: KELT-South · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | KELT-10 |
| Spectral Type | G0 V |
| Effective Temp (Teff) | 5,948 K |
| Stellar Radius | 1.2090 R☉ |
| Stellar Mass | 1.1120 M☉ |
| Bolometric Luminosity | 1.641 L☉ |
| Metallicity [Fe/H] | 0.090 dex |
| Stellar Age | 4.500 Gyr |
| Apparent Magnitude | V: 10.617 · G: 10.701 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.052500 AU |
| Orbital Period | 4.166 days |
| Mean Orbital Velocity | 137.1 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.6100° |
| Mean Bulk Density | 0.31 g/cm³ (41.5 km/s vesc) |
| Insolation Flux | 600.0000 S⊕ (~816,600 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 614.500 LY (188.404 pc) |