HATS-67 b
Astrophysical Synthesis & Habitability Characterization
HATS-67 b is a confirmed gas giant exoplanet orbiting the star HATS-67, located approximately 3131.5 light-years (960.11 parsecs) from the Solar System. First announced in 2018 by HATSouth using the Transit detection technique (producing an estimated primary transit depth of 1.4439% across the stellar disk), this world measures 18.887 Earth radii (1.68 Jupiter radii) and has a measured mass of 460.854 Earth masses (1.45 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.38 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 55.3 km/s.
In its orbital architecture around HATS-67, HATS-67 b completes one full revolution every 1.609 Earth days at a semi-major axis of 0.03032 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 205 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.057 carries the world between 0.0286 AU at periapsis and 0.032 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 2193 K (+1920°C / +3488°F) and receiving 3,821.00 S⊕ (~5,200,381 W/m²), HATS-67 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HATS-67 is classified as a stellar host with an effective photospheric temperature of 6,594 K, a radius of 1.441 R☉, a mass of 1.435 M☉, an estimated bolometric luminosity of 3.522 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.51 Gyr and a metallicity of [Fe/H] = 0.332 dex (metal-rich relative to the Sun). From Earth, HATS-67 shines at apparent V-band magnitude 13.698 (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-67 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,594 K |
| Stellar Radius | 1.4410 R☉ |
| Stellar Mass | 1.4350 M☉ |
| Bolometric Luminosity | 3.522 L☉ |
| Metallicity [Fe/H] | 0.332 dex |
| Stellar Age | 0.510 Gyr |
| Apparent Magnitude | V: 13.698 · G: 13.560 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.030320 AU |
| Orbital Period | 1.609 days |
| Mean Orbital Velocity | 205 km/s |
| Orbital Eccentricity (e) | 0.05700 |
| Orbital Inclination (i) | 79.0300° |
| Mean Bulk Density | 0.38 g/cm³ (55.3 km/s vesc) |
| Insolation Flux | 3821.0000 S⊕ (~5,200,381 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3131.500 LY (960.109 pc) |