GJ 3341 b
Astrophysical Synthesis & Habitability Characterization
GJ 3341 b is a confirmed sub-neptune exoplanet orbiting the star GJ 3341, located approximately 77 light-years (23.62 parsecs) from the Solar System. First announced in 2015 by La Silla Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 2.46 Earth radii and has a measured mass of 6.6 Earth masses. Combining its mass and radius yields a mean bulk density of 2.44 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.09 g⊕ (10.69 m/s²), and an escape velocity of 18.3 km/s.
In its orbital architecture around GJ 3341, GJ 3341 b completes one full revolution every 14.207 Earth days at a semi-major axis of 0.089 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 68.2 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.31, swinging from 0.0614 AU at periapsis out to 0.1166 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 378 K (+105°C / +221°F) and receiving 3.66 S⊕ (~4,978 W/m²), GJ 3341 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star GJ 3341 is classified as a low-mass red dwarf of spectral type M2.5 with an effective photospheric temperature of 3,526 K, a radius of 0.439 R☉, a mass of 0.47 M☉, an estimated bolometric luminosity of 0.027 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.09 dex (near-solar heavy-element abundance). From Earth, GJ 3341 shines at apparent V-band magnitude 12.062 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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: La Silla Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | GJ 3341 |
| Spectral Type | M2.5 |
| Effective Temp (Teff) | 3,526 K |
| Stellar Radius | 0.4390 R☉ |
| Stellar Mass | 0.4700 M☉ |
| Bolometric Luminosity | 0.027 L☉ |
| Metallicity [Fe/H] | -0.090 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 12.062 · G: 11.103 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.089000 AU |
| Orbital Period | 14.207 days |
| Mean Orbital Velocity | 68.2 km/s |
| Orbital Eccentricity (e) | 0.31000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.44 g/cm³ (18.3 km/s vesc) |
| Insolation Flux | 3.6578 S⊕ (~4,978 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 77.000 LY (23.619 pc) |