GJ 179 b
Astrophysical Synthesis & Habitability Characterization
GJ 179 b is a confirmed gas giant exoplanet orbiting the star GJ 179, located approximately 40.3 light-years (12.36 parsecs) from the Solar System. First announced in 2009 by W. M. Keck Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.8 Earth radii (1.23 Jupiter radii) and has a measured mass of 301.937 Earth masses (0.95 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.63 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.59 g⊕ (15.59 m/s²), and an escape velocity of 52.3 km/s.
In its orbital architecture around GJ 179, GJ 179 b completes one full revolution every 2288 Earth days (6.26Julian years) at a semi-major axis of 2.41 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 11.5 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.21 carries the world between 1.9039 AU at periapsis and 2.9161 AU at apoapsis, driving measurable seasonal insolation cycles.
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 65 K (-208°C / -342°F) and an incident flux of 0.00 S⊕ (~4 W/m²), surface water and volatile species on GJ 179 b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star GJ 179 is classified as a low-mass red dwarf of spectral type M3.5 V with an effective photospheric temperature of 3,370 K, a radius of 0.38 R☉, a mass of 0.357 M☉, an estimated bolometric luminosity of 0.017 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.3 dex (metal-rich relative to the Sun). From Earth, GJ 179 shines at apparent V-band magnitude 11.963 (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: W. M. Keck Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | GJ 179 |
| Spectral Type | M3.5 V |
| Effective Temp (Teff) | 3,370 K |
| Stellar Radius | 0.3800 R☉ |
| Stellar Mass | 0.3570 M☉ |
| Bolometric Luminosity | 0.017 L☉ |
| Metallicity [Fe/H] | 0.300 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 11.963 · G: 10.706 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2.410000 AU |
| Orbital Period | 2288 days |
| Mean Orbital Velocity | 11.5 km/s |
| Orbital Eccentricity (e) | 0.21000 |
| Orbital Inclination (i) | 61.0000° |
| Mean Bulk Density | 0.63 g/cm³ (52.3 km/s vesc) |
| Insolation Flux | 0.0028 S⊕ (~4 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 40.300 LY (12.356 pc) |