HATS-10 b
Astrophysical Synthesis & Habitability Characterization
HATS-10 b is a confirmed gas giant exoplanet orbiting the star HATS-10, located approximately 1744.6 light-years (534.89 parsecs) from the Solar System. First announced in 2015 by HATSouth using the Transit detection technique (producing an estimated primary transit depth of 0.8122% across the stellar disk), this world measures 10.862 Earth radii (0.97 Jupiter radii) and has a measured mass of 167.179 Earth masses (0.53 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.72 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.42 g⊕ (13.93 m/s²), and an escape velocity of 43.9 km/s.
In its orbital architecture around HATS-10, HATS-10 b completes one full revolution every 3.313 Earth days at a semi-major axis of 0.04491 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 147.5 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.501, swinging from 0.0224 AU at periapsis out to 0.0674 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1407 K (+1134°C / +2073°F) and receiving 836.86 S⊕ (~1,138,961 W/m²), HATS-10 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HATS-10 is classified as a stellar host with an effective photospheric temperature of 5,880 K, a radius of 1.105 R☉, a mass of 1.101 M☉, an estimated bolometric luminosity of 1.31 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.3 Gyr and a metallicity of [Fe/H] = 0.15 dex (metal-rich relative to the Sun). From Earth, HATS-10 shines at apparent V-band magnitude 13.202 (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-10 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,880 K |
| Stellar Radius | 1.1050 R☉ |
| Stellar Mass | 1.1010 M☉ |
| Bolometric Luminosity | 1.31 L☉ |
| Metallicity [Fe/H] | 0.150 dex |
| Stellar Age | 3.300 Gyr |
| Apparent Magnitude | V: 13.202 · G: 12.984 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.044910 AU |
| Orbital Period | 3.313 days |
| Mean Orbital Velocity | 147.5 km/s |
| Orbital Eccentricity (e) | 0.50100 |
| Orbital Inclination (i) | 87.7900° |
| Mean Bulk Density | 0.72 g/cm³ (43.9 km/s vesc) |
| Insolation Flux | 836.8558 S⊕ (~1,138,961 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1744.600 LY (534.889 pc) |