HATS-35 b
Astrophysical Synthesis & Habitability Characterization
HATS-35 b is a confirmed gas giant exoplanet orbiting the star HATS-35, located approximately 1678.3 light-years (514.56 parsecs) from the Solar System. First announced in 2016 by HATSouth using the Transit detection technique (producing an estimated primary transit depth of 1.1022% across the stellar disk), this world measures 16.41 Earth radii (1.46 Jupiter radii) and has a measured mass of 388.388 Earth masses (1.22 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.48 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.44 g⊕ (14.12 m/s²), and an escape velocity of 54.4 km/s.
In its orbital architecture around HATS-35, HATS-35 b completes one full revolution every 1.821 Earth days at a semi-major axis of 0.03199 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 191.1 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.306, swinging from 0.0222 AU at periapsis out to 0.0418 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 2037 K (+1764°C / +3207°F) and receiving 2,440.70 S⊕ (~3,321,793 W/m²), HATS-35 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HATS-35 is classified as a stellar host with an effective photospheric temperature of 6,300 K, a radius of 1.433 R☉, a mass of 1.317 M☉, an estimated bolometric luminosity of 2.902 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.13 Gyr and a metallicity of [Fe/H] = 0.21 dex (metal-rich relative to the Sun). From Earth, HATS-35 shines at apparent V-band magnitude 12.609 (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-35 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,300 K |
| Stellar Radius | 1.4330 R☉ |
| Stellar Mass | 1.3170 M☉ |
| Bolometric Luminosity | 2.902 L☉ |
| Metallicity [Fe/H] | 0.210 dex |
| Stellar Age | 2.130 Gyr |
| Apparent Magnitude | V: 12.609 · G: 12.461 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.031990 AU |
| Orbital Period | 1.821 days |
| Mean Orbital Velocity | 191.1 km/s |
| Orbital Eccentricity (e) | 0.30600 |
| Orbital Inclination (i) | 86.9000° |
| Mean Bulk Density | 0.48 g/cm³ (54.4 km/s vesc) |
| Insolation Flux | 2440.7000 S⊕ (~3,321,793 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1678.300 LY (514.555 pc) |