HATS-34 b
Astrophysical Synthesis & Habitability Characterization
HATS-34 b is a confirmed gas giant exoplanet orbiting the star HATS-34, located approximately 1659.6 light-years (508.84 parsecs) from the Solar System. First announced in 2016 by HATSouth using the Transit detection technique (producing an estimated primary transit depth of 1.9722% across the stellar disk), this world measures 14.37 Earth radii (1.28 Jupiter radii) and has a measured mass of 302.255 Earth masses (0.95 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.56 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.46 g⊕ (14.32 m/s²), and an escape velocity of 51.3 km/s.
In its orbital architecture around HATS-34, HATS-34 b completes one full revolution every 2.106 Earth days at a semi-major axis of 0.03165 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 163.5 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.108 carries the world between 0.0282 AU at periapsis and 0.0351 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1431 K (+1158°C / +2116°F) and receiving 691.84 S⊕ (~941,598 W/m²), HATS-34 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HATS-34 is classified as a stellar host with an effective photospheric temperature of 5,456 K, a radius of 0.9381 R☉, a mass of 0.952 M☉, an estimated bolometric luminosity of 0.7 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.6 Gyr and a metallicity of [Fe/H] = 0.174 dex (metal-rich relative to the Sun). From Earth, HATS-34 shines at apparent V-band magnitude 13.857 (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-34 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,456 K |
| Stellar Radius | 0.9381 R☉ |
| Stellar Mass | 0.9520 M☉ |
| Bolometric Luminosity | 0.7 L☉ |
| Metallicity [Fe/H] | 0.174 dex |
| Stellar Age | 5.600 Gyr |
| Apparent Magnitude | V: 13.857 · G: 13.679 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.031650 AU |
| Orbital Period | 2.106 days |
| Mean Orbital Velocity | 163.5 km/s |
| Orbital Eccentricity (e) | 0.10800 |
| Orbital Inclination (i) | 82.7300° |
| Mean Bulk Density | 0.56 g/cm³ (51.3 km/s vesc) |
| Insolation Flux | 691.8428 S⊕ (~941,598 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1659.600 LY (508.842 pc) |