HD 35759 b
Astrophysical Synthesis & Habitability Characterization
HD 35759 b is a confirmed gas giant exoplanet orbiting the star HD 35759, located approximately 232.4 light-years (71.24 parsecs) from the Solar System. First announced in 2016 by Haute-Provence Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13 Earth radii (1.16 Jupiter radii) and has a measured mass of 1195.041 Earth masses (3.76 Jupiter masses). Combining its mass and radius yields a mean bulk density of 3 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 7.07 g⊕ (69.33 m/s²), and an escape velocity of 107.2 km/s.
In its orbital architecture around HD 35759, HD 35759 b completes one full revolution every 82.467 Earth days at a semi-major axis of 0.389 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 51.3 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.389, swinging from 0.2377 AU at periapsis out to 0.5403 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 622 K (+349°C / +660°F) and receiving 22.77 S⊕ (~30,988 W/m²), HD 35759 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HD 35759 is classified as a solar-type yellow star of spectral type G0 with an effective photospheric temperature of 6,060 K, a radius of 1.76 R☉, a mass of 1.15 M☉, an estimated bolometric luminosity of 3.748 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.04 dex (near-solar heavy-element abundance). From Earth, HD 35759 shines at apparent V-band magnitude 7.74 (accessible to binoculars and small amateur telescopes) 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: Haute-Provence Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 35759 |
| Spectral Type | G0 |
| Effective Temp (Teff) | 6,060 K |
| Stellar Radius | 1.7600 R☉ |
| Stellar Mass | 1.1500 M☉ |
| Bolometric Luminosity | 3.748 L☉ |
| Metallicity [Fe/H] | 0.040 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 7.740 · G: 7.596 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.389000 AU |
| Orbital Period | 82.467 days |
| Mean Orbital Velocity | 51.3 km/s |
| Orbital Eccentricity (e) | 0.38900 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3 g/cm³ (107.2 km/s vesc) |
| Insolation Flux | 22.7689 S⊕ (~30,988 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 232.400 LY (71.242 pc) |