HATS-24 b
Astrophysical Synthesis & Habitability Characterization
HATS-24 b is a confirmed gas giant exoplanet orbiting the star HATS-24, located approximately 1611.8 light-years (494.18 parsecs) from the Solar System. First announced in 2017 by HATSouth using the Transit detection technique (producing an estimated primary transit depth of 1.6384% across the stellar disk), this world measures 15.637 Earth radii (1.4 Jupiter radii) and has a measured mass of 718.296 Earth masses (2.26 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.04 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 2.94 g⊕ (28.83 m/s²), and an escape velocity of 75.8 km/s.
In its orbital architecture around HATS-24, HATS-24 b completes one full revolution every 1.348 Earth days at a semi-major axis of 0.0238 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 192 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 2166 K (+1893°C / +3439°F) and receiving 2,706.96 S⊕ (~3,684,173 W/m²), HATS-24 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HATS-24 is classified as a warm F-type star of spectral type F V with an effective photospheric temperature of 6,125 K, a radius of 1.12 R☉, a mass of 1.07 M☉, an estimated bolometric luminosity of 1.584 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.7 Gyr and a metallicity of [Fe/H] = -0.229 dex (metal-poor relative to the Sun). From Earth, HATS-24 shines at apparent V-band magnitude 12.915 (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: HATSouth · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HATS-24 |
| Spectral Type | F V |
| Effective Temp (Teff) | 6,125 K |
| Stellar Radius | 1.1200 R☉ |
| Stellar Mass | 1.0700 M☉ |
| Bolometric Luminosity | 1.584 L☉ |
| Metallicity [Fe/H] | -0.229 dex |
| Stellar Age | 3.700 Gyr |
| Apparent Magnitude | V: 12.915 · G: 12.691 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.023800 AU |
| Orbital Period | 1.348 days |
| Mean Orbital Velocity | 192 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 85.9700° |
| Mean Bulk Density | 1.04 g/cm³ (75.8 km/s vesc) |
| Insolation Flux | 2706.9606 S⊕ (~3,684,173 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1611.800 LY (494.182 pc) |