HD 233832 b
Astrophysical Synthesis & Habitability Characterization
HD 233832 b is a confirmed gas giant exoplanet orbiting the star HD 233832, located approximately 191.6 light-years (58.74 parsecs) from the Solar System. First announced in 2018 by Roque de los Muchachos Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.5 Earth radii (1.2 Jupiter radii) and has a measured mass of 565.737 Earth masses (1.78 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.27 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.1 g⊕ (30.4 m/s²), and an escape velocity of 72.4 km/s.
In its orbital architecture around HD 233832, HD 233832 b completes one full revolution every 2058 Earth days (5.63Julian years) at a semi-major axis of 2.827 AU (corresponding to the middle-system regime between Mars at 1.52 AU and Jupiter at 5.20 AU). Its mean orbital velocity is approximately 14.9 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.359, swinging from 1.8121 AU at periapsis out to 3.8419 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 118 K (-155°C / -247°F) and an incident flux of 0.04 S⊕ (~51 W/m²), surface water and volatile species on HD 233832 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star HD 233832 is classified as a solar-type yellow star of spectral type G0 with an effective photospheric temperature of 4,981 K, a radius of 0.68 R☉, a mass of 0.71 M☉, an estimated bolometric luminosity of 0.255 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.417 Gyr and a metallicity of [Fe/H] = -0.66 dex (metal-poor relative to the Sun). From Earth, HD 233832 shines at apparent V-band magnitude 10.15 (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: Roque de los Muchachos Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HD 233832 |
| Spectral Type | G0 |
| Effective Temp (Teff) | 4,981 K |
| Stellar Radius | 0.6800 R☉ |
| Stellar Mass | 0.7100 M☉ |
| Bolometric Luminosity | 0.255 L☉ |
| Metallicity [Fe/H] | -0.660 dex |
| Stellar Age | 5.417 Gyr |
| Apparent Magnitude | V: 10.150 · G: 9.946 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2.827000 AU |
| Orbital Period | 2058 days |
| Mean Orbital Velocity | 14.9 km/s |
| Orbital Eccentricity (e) | 0.35900 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.27 g/cm³ (72.4 km/s vesc) |
| Insolation Flux | 0.0376 S⊕ (~51 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 191.600 LY (58.742 pc) |