G 268-110 b
Astrophysical Synthesis & Habitability Characterization
G 268-110 b is a confirmed terrestrial exoplanet orbiting the star G 268-110. First announced in 2025 by Calar Alto Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 1.13 Earth radii and has a measured mass of 1.52 Earth masses. Combining its mass and radius yields a mean bulk density of 5.81 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.19 g⊕ (11.67 m/s²), and an escape velocity of 13 km/s.
In its orbital architecture around G 268-110, G 268-110 b completes one full revolution every 1.433 Earth days at a semi-major axis of 0.01283 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 97.4 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 534 K (+261°C / +502°F) and receiving 13.57 S⊕ (~18,469 W/m²), G 268-110 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star G 268-110 is classified as a low-mass red dwarf of spectral type M5.0 V with a radius of 0.177 R☉, a mass of 0.137 M☉. From Earth, G 268-110 shines at apparent V-band magnitude 14.7 (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: Calar Alto Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | G 268-110 |
| Spectral Type | M5.0 V |
| Effective Temp (Teff) | — |
| Stellar Radius | 0.1770 R☉ |
| Stellar Mass | 0.1370 M☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 14.700 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.012830 AU |
| Orbital Period | 1.433 days |
| Mean Orbital Velocity | 97.4 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 5.81 g/cm³ (13 km/s vesc) |
| Insolation Flux | 13.5700 S⊕ (~18,469 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | — |