Gl 410 b
Astrophysical Synthesis & Habitability Characterization
Gl 410 b is a confirmed sub-neptune exoplanet orbiting the star Gl 410, located approximately 38.9 light-years (11.93 parsecs) from the Solar System. First announced in 2025 by Mauna Kea Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 2.83 Earth radii and has a measured mass of 8.4 Earth masses. Combining its mass and radius yields a mean bulk density of 2.04 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.05 g⊕ (10.3 m/s²), and an escape velocity of 19.3 km/s.
In its orbital architecture around Gl 410, Gl 410 b completes one full revolution every 6.02 Earth days at a semi-major axis of 0.0531 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 96 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 592 K (+319°C / +606°F) and receiving 20.46 S⊕ (~27,840 W/m²), Gl 410 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Gl 410 is classified as an orange K-type star of spectral type K with an effective photospheric temperature of 3,842 K, a radius of 0.543 R☉, a mass of 0.55 M☉, an estimated bolometric luminosity of 0.058 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.48 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, Gl 410 shines at apparent V-band magnitude 9.57 (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: Mauna Kea Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | Gl 410 |
| Spectral Type | K |
| Effective Temp (Teff) | 3,842 K |
| Stellar Radius | 0.5430 R☉ |
| Stellar Mass | 0.5500 M☉ |
| Bolometric Luminosity | 0.058 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 0.480 Gyr |
| Apparent Magnitude | V: 9.570 · G: 8.807 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.053100 AU |
| Orbital Period | 6.02 days |
| Mean Orbital Velocity | 96 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.04 g/cm³ (19.3 km/s vesc) |
| Insolation Flux | 20.4555 S⊕ (~27,840 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 38.900 LY (11.932 pc) |