KELT-24 b
Astrophysical Synthesis & Habitability Characterization
KELT-24 b is a confirmed gas giant exoplanet orbiting the star KELT-24, located approximately 314.8 light-years (96.52 parsecs) from the Solar System. First announced in 2019 by KELT-North using the Transit detection technique (producing an estimated primary transit depth of 0.7586% across the stellar disk), this world measures 12.711 Earth radii (1.13 Jupiter radii) and has a measured mass of 1458.832 Earth masses (4.59 Jupiter masses). Combining its mass and radius yields a mean bulk density of 3.92 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 9.03 g⊕ (88.55 m/s²), and an escape velocity of 119.8 km/s.
In its orbital architecture around KELT-24, KELT-24 b completes one full revolution every 5.551 Earth days at a semi-major axis of 0.0665 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 130.3 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.0319 (ranging from 0.0644 AU at periapsis to 0.0686 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1391 K (+1118°C / +2044°F) and receiving 624.00 S⊕ (~849,264 W/m²), KELT-24 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star KELT-24 is classified as a warm F-type star of spectral type F7 with an effective photospheric temperature of 6,426 K, a radius of 1.338 R☉, a mass of 1.268 M☉, an estimated bolometric luminosity of 2.739 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.98 Gyr and a metallicity of [Fe/H] = 0.138 dex (metal-rich relative to the Sun). From Earth, KELT-24 shines at apparent V-band magnitude 8.34 (accessible to binoculars and small amateur telescopes) 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: KELT-North · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | KELT-24 |
| Spectral Type | F7 |
| Effective Temp (Teff) | 6,426 K |
| Stellar Radius | 1.3380 R☉ |
| Stellar Mass | 1.2680 M☉ |
| Bolometric Luminosity | 2.739 L☉ |
| Metallicity [Fe/H] | 0.138 dex |
| Stellar Age | 1.980 Gyr |
| Apparent Magnitude | V: 8.340 · G: 8.238 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.066500 AU |
| Orbital Period | 5.551 days |
| Mean Orbital Velocity | 130.3 km/s |
| Orbital Eccentricity (e) | 0.03190 |
| Orbital Inclination (i) | 89.6700° |
| Mean Bulk Density | 3.92 g/cm³ (119.8 km/s vesc) |
| Insolation Flux | 624.0000 S⊕ (~849,264 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 314.800 LY (96.517 pc) |