HATS-52 b
Astrophysical Synthesis & Habitability Characterization
HATS-52 b is a confirmed gas giant exoplanet orbiting the star HATS-52, located approximately 1810.6 light-years (555.13 parsecs) from the Solar System. First announced in 2017 by HATSouth using the Transit detection technique (producing an estimated primary transit depth of 1.8435% across the stellar disk), this world measures 15.491 Earth radii (1.38 Jupiter radii) and has a measured mass of 711.939 Earth masses (2.24 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.06 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 2.97 g⊕ (29.13 m/s²), and an escape velocity of 75.8 km/s.
In its orbital architecture around HATS-52, HATS-52 b completes one full revolution every 1.367 Earth days at a semi-major axis of 0.02498 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 198.8 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.246 carries the world between 0.0188 AU at periapsis and 0.0311 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1834 K (+1561°C / +2842°F) and receiving 1,310.22 S⊕ (~1,783,209 W/m²), HATS-52 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HATS-52 is classified as a stellar host with an effective photospheric temperature of 6,010 K, a radius of 1.046 R☉, a mass of 1.111 M☉, an estimated bolometric luminosity of 1.281 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.2 Gyr and a metallicity of [Fe/H] = -0.284 dex (metal-poor relative to the Sun). From Earth, HATS-52 shines at apparent V-band magnitude 13.844 (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-52 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,010 K |
| Stellar Radius | 1.0460 R☉ |
| Stellar Mass | 1.1110 M☉ |
| Bolometric Luminosity | 1.281 L☉ |
| Metallicity [Fe/H] | -0.284 dex |
| Stellar Age | 1.200 Gyr |
| Apparent Magnitude | V: 13.844 · G: 13.627 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.024980 AU |
| Orbital Period | 1.367 days |
| Mean Orbital Velocity | 198.8 km/s |
| Orbital Eccentricity (e) | 0.24600 |
| Orbital Inclination (i) | 84.7000° |
| Mean Bulk Density | 1.06 g/cm³ (75.8 km/s vesc) |
| Insolation Flux | 1310.2200 S⊕ (~1,783,209 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1810.600 LY (555.134 pc) |