HAT-P-35 b
Astrophysical Synthesis & Habitability Characterization
HAT-P-35 b is a confirmed gas giant exoplanet orbiting the star HAT-P-35, located approximately 1653.5 light-years (506.97 parsecs) from the Solar System. First announced in 2011 by HATNet using the Transit detection technique (producing an estimated primary transit depth of 0.9098% across the stellar disk), this world measures 14.93 Earth radii (1.33 Jupiter radii) and has a measured mass of 335.628 Earth masses (1.06 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 1.51 g⊕ (14.81 m/s²), and an escape velocity of 53 km/s.
In its orbital architecture around HAT-P-35, HAT-P-35 b completes one full revolution every 3.647 Earth days at a semi-major axis of 0.04978 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 148.5 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.02 (ranging from 0.0488 AU at periapsis to 0.0508 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1581 K (+1308°C / +2386°F) and receiving 999.67 S⊕ (~1,360,549 W/m²), HAT-P-35 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HAT-P-35 is classified as a stellar host with an effective photospheric temperature of 6,096 K, a radius of 1.435 R☉, a mass of 1.236 M☉, an estimated bolometric luminosity of 2.551 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.5 Gyr and a metallicity of [Fe/H] = 0.11 dex (metal-rich relative to the Sun). From Earth, HAT-P-35 shines at apparent V-band magnitude 12.389 (faint and requiring research-grade or CCD telescopic photometry) in the Northern 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: HATNet · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HAT-P-35 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,096 K |
| Stellar Radius | 1.4350 R☉ |
| Stellar Mass | 1.2360 M☉ |
| Bolometric Luminosity | 2.551 L☉ |
| Metallicity [Fe/H] | 0.110 dex |
| Stellar Age | 3.500 Gyr |
| Apparent Magnitude | V: 12.389 · G: 12.280 |
| System Architecture | 3 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.049780 AU |
| Orbital Period | 3.647 days |
| Mean Orbital Velocity | 148.5 km/s |
| Orbital Eccentricity (e) | 0.02000 |
| Orbital Inclination (i) | 87.3000° |
| Mean Bulk Density | 0.56 g/cm³ (53 km/s vesc) |
| Insolation Flux | 999.6688 S⊕ (~1,360,549 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1653.500 LY (506.965 pc) |