GJ 682 b
Astrophysical Synthesis & Habitability Characterization
GJ 682 b is a confirmed super-earth exoplanet orbiting the star GJ 682, located approximately 16.3 light-years (5.01 parsecs) from the Solar System. First announced in 2014 by Multiple Observatories using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 1.93 Earth radii and has a measured mass of 4.4 Earth masses. Combining its mass and radius yields a mean bulk density of 3.37 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.18 g⊕ (11.57 m/s²), and an escape velocity of 16.9 km/s.
In its orbital architecture around GJ 682, GJ 682 b completes one full revolution every 17.478 Earth days at a semi-major axis of 0.08 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 49.8 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.08 carries the world between 0.0736 AU at periapsis and 0.0864 AU at apoapsis, driving measurable seasonal insolation cycles.
✓ Classified as a Temperate Habitable Zone Candidate.
With an estimated equilibrium temperature of 282 K (+9°C / +48°F) and an incident stellar irradiance of 0.31 S⊕ (~425 W/m²), GJ 682 b orbits within the empirical circumstellar habitable zone where a rocky surface under sufficient atmospheric pressure can maintain liquid surface water.
The host star GJ 682 is classified as a low-mass red dwarf of spectral type M3.5 V with an effective photospheric temperature of 3,028 K, a radius of 0.2983 R☉, a mass of 0.27 M☉, an estimated bolometric luminosity of 0.00671 L☉. From Earth, GJ 682 shines at apparent V-band magnitude 10.94 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The GJ 682 system is a multi-planet architecture hosting 2 confirmed worlds, with GJ 682 b sharing its stellar neighborhood alongside GJ 682 c.
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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | GJ 682 |
| Spectral Type | M3.5 V |
| Effective Temp (Teff) | 3,028 K |
| Stellar Radius | 0.2983 R☉ |
| Stellar Mass | 0.2700 M☉ |
| Bolometric Luminosity | 0.00671 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 10.940 · G: 9.570 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.080000 AU |
| Orbital Period | 17.478 days |
| Mean Orbital Velocity | 49.8 km/s |
| Orbital Eccentricity (e) | 0.08000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3.37 g/cm³ (16.9 km/s vesc) |
| Insolation Flux | 0.3125 S⊕ (~425 W/m²) |
| Habitable Zone Status | ★ Temperate Zone |
| Celestial Distance | 16.300 LY (5.007 pc) |