HATS-30 b
Astrophysical Synthesis & Habitability Characterization
HATS-30 b is a confirmed gas giant exoplanet orbiting the star HATS-30, located approximately 1115.9 light-years (342.14 parsecs) from the Solar System. First announced in 2016 by HATSouth using the Transit detection technique (producing an estimated primary transit depth of 1.2952% across the stellar disk), this world measures 13.171 Earth radii (1.18 Jupiter radii) and has a measured mass of 224.388 Earth masses (0.71 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.54 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.29 g⊕ (12.65 m/s²), and an escape velocity of 46.2 km/s.
In its orbital architecture around HATS-30, HATS-30 b completes one full revolution every 3.174 Earth days at a semi-major axis of 0.04354 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 149.2 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.096 carries the world between 0.0394 AU at periapsis and 0.0477 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1414 K (+1141°C / +2086°F) and receiving 718.91 S⊕ (~978,436 W/m²), HATS-30 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HATS-30 is classified as a solar-type yellow star of spectral type G with an effective photospheric temperature of 5,943 K, a radius of 1.061 R☉, a mass of 1.093 M☉, an estimated bolometric luminosity of 1.26 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.3 Gyr and a metallicity of [Fe/H] = 0.06 dex (metal-rich relative to the Sun). From Earth, HATS-30 shines at apparent V-band magnitude 12.283 (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-30 |
| Spectral Type | G |
| Effective Temp (Teff) | 5,943 K |
| Stellar Radius | 1.0610 R☉ |
| Stellar Mass | 1.0930 M☉ |
| Bolometric Luminosity | 1.26 L☉ |
| Metallicity [Fe/H] | 0.060 dex |
| Stellar Age | 2.300 Gyr |
| Apparent Magnitude | V: 12.283 · G: 12.082 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.043540 AU |
| Orbital Period | 3.174 days |
| Mean Orbital Velocity | 149.2 km/s |
| Orbital Eccentricity (e) | 0.09600 |
| Orbital Inclination (i) | 86.8400° |
| Mean Bulk Density | 0.54 g/cm³ (46.2 km/s vesc) |
| Insolation Flux | 718.9097 S⊕ (~978,436 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1115.900 LY (342.140 pc) |