omi CrB b
Astrophysical Synthesis & Habitability Characterization
omi CrB b is a confirmed gas giant exoplanet orbiting the star omi CrB, located approximately 276.5 light-years (84.79 parsecs) from the Solar System. First announced in 2012 by Okayama Astrophysical Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.7 Earth radii (1.22 Jupiter radii) and has a measured mass of 355.968 Earth masses (1.12 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.76 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.9 g⊕ (18.63 m/s²), and an escape velocity of 57 km/s.
In its orbital architecture around omi CrB, omi CrB b completes one full revolution every 187.01 Earth days at a semi-major axis of 0.699 AU (situated at an orbital separation between Mercury's 0.39 AU and Venus's 0.72 AU). Its mean orbital velocity is approximately 40.7 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.105 carries the world between 0.6256 AU at periapsis and 0.7724 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 948 K (+675°C / +1247°F) and receiving 135.84 S⊕ (~184,874 W/m²), omi CrB b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star omi CrB is classified as an orange K-type star of spectral type K0 III with an effective photospheric temperature of 4,769 K, a radius of 11.87 R☉, a mass of 1.3 M☉, an estimated bolometric luminosity of 65.388 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.827 Gyr and a metallicity of [Fe/H] = -0.27 dex (metal-poor relative to the Sun). From Earth, omi CrB shines at apparent V-band magnitude 5.505 (visible to the unaided human eye under dark skies) 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: Okayama Astrophysical Observatory · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | omi CrB |
| Spectral Type | K0 III |
| Effective Temp (Teff) | 4,769 K |
| Stellar Radius | 11.8700 R☉ |
| Stellar Mass | 1.3000 M☉ |
| Bolometric Luminosity | 65.388 L☉ |
| Metallicity [Fe/H] | -0.270 dex |
| Stellar Age | 7.827 Gyr |
| Apparent Magnitude | V: 5.505 · G: 5.221 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.699000 AU |
| Orbital Period | 187.01 days |
| Mean Orbital Velocity | 40.7 km/s |
| Orbital Eccentricity (e) | 0.10500 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.76 g/cm³ (57 km/s vesc) |
| Insolation Flux | 135.8368 S⊕ (~184,874 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 276.500 LY (84.788 pc) |