HD 214823 b
Astrophysical Synthesis & Habitability Characterization
HD 214823 b is a confirmed gas giant exoplanet orbiting the star HD 214823, located approximately 330.6 light-years (101.37 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 12.1 Earth radii (1.08 Jupiter radii) and has a measured mass of 5914.787 Earth masses (18.61 Jupiter masses). Combining its mass and radius yields a mean bulk density of 18.41 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 40.4 g⊕ (396.19 m/s²), and an escape velocity of 247.3 km/s.
In its orbital architecture around HD 214823, HD 214823 b completes one full revolution every 1854.844 Earth days (5.08Julian years) at a semi-major axis of 3.08 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 18.1 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.161 carries the world between 2.5841 AU at periapsis and 3.5759 AU at apoapsis, driving measurable seasonal insolation cycles.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.100 R⊕, HD 214823 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star HD 214823 is classified as a solar-type yellow star of spectral type G0 with an effective photospheric temperature of 6,215 K, a radius of 2.04 R☉, a mass of 1.115 M☉, an estimated bolometric luminosity of 5.571 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.7 Gyr and a metallicity of [Fe/H] = 0.17 dex (metal-rich relative to the Sun). From Earth, HD 214823 shines at apparent V-band magnitude 8.06 (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 214823 |
| Spectral Type | G0 |
| Effective Temp (Teff) | 6,215 K |
| Stellar Radius | 2.0400 R☉ |
| Stellar Mass | 1.1150 M☉ |
| Bolometric Luminosity | 5.571 L☉ |
| Metallicity [Fe/H] | 0.170 dex |
| Stellar Age | 2.700 Gyr |
| Apparent Magnitude | V: 8.060 · G: 7.916 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 3.080000 AU |
| Orbital Period | 1854.844 days |
| Mean Orbital Velocity | 18.1 km/s |
| Orbital Eccentricity (e) | 0.16100 |
| Orbital Inclination (i) | 99.5100° |
| Mean Bulk Density | 18.41 g/cm³ (247.3 km/s vesc) |
| Insolation Flux | 0.4586 S⊕ (~624 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 330.600 LY (101.368 pc) |