Oph 11 b
Astrophysical Synthesis & Habitability Characterization
Oph 11 b is a confirmed gas giant exoplanet orbiting the star Oph 11, located approximately 444.1 light-years (136.17 parsecs) from the Solar System. First announced in 2006 by Gemini Observatory using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 12.3 Earth radii (1.1 Jupiter radii) and has a measured mass of 4449.62 Earth masses (14 Jupiter masses). Combining its mass and radius yields a mean bulk density of 13.18 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 29.41 g⊕ (288.41 m/s²), and an escape velocity of 212.8 km/s.
In its orbital architecture around Oph 11, Oph 11 b completes one full revolution every 7300000 Earth days (19986.31Julian years) at a semi-major axis of 243 AU (a wide outer-system orbit beyond Jupiter's 5.20 AU distance in our Solar System). Its mean orbital velocity is approximately 0.4 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 2175 K (+1902°C / +3456°F), Oph 11 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Oph 11 is classified as a low-mass red dwarf of spectral type M9 with an effective photospheric temperature of 2,375 K, a radius of 0.2327 R☉, a mass of 0.016 M☉, an estimated bolometric luminosity of 0.00155 L☉. Stellar evolution modeling indicates an estimated stellar age of 5 Gyr. From Earth, Oph 11 shines at apparent Gaia G-band magnitude 18.912 (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: Gemini Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | Oph 11 |
| Spectral Type | M9 |
| Effective Temp (Teff) | 2,375 K |
| Stellar Radius | 0.2327 R☉ |
| Stellar Mass | 0.0160 M☉ |
| Bolometric Luminosity | 0.00155 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 5.000 Gyr |
| Apparent Magnitude | · G: 18.912 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 243.000000 AU |
| Orbital Period | 7300000 days |
| Mean Orbital Velocity | 0.4 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 13.18 g/cm³ (212.8 km/s vesc) |
| Insolation Flux | 0.0000 S⊕ |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 444.100 LY (136.166 pc) |