CoRoT-28 b
Astrophysical Synthesis & Habitability Characterization
CoRoT-28 b is a confirmed gas giant exoplanet orbiting the star CoRoT-28, located approximately 2499 light-years (766.18 parsecs) from the Solar System. First announced in 2015 by CoRoT using the Transit detection technique (producing an estimated primary transit depth of 0.304% across the stellar disk), this world measures 10.705 Earth radii (0.96 Jupiter radii) and has a measured mass of 153.83 Earth masses (0.48 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.69 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.34 g⊕ (13.14 m/s²), and an escape velocity of 42.4 km/s.
In its orbital architecture around CoRoT-28, CoRoT-28 b completes one full revolution every 5.209 Earth days at a semi-major axis of 0.0603 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 125.9 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.047 (ranging from 0.0575 AU at periapsis to 0.0631 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1349 K (+1076°C / +1969°F) and receiving 672.75 S⊕ (~915,616 W/m²), CoRoT-28 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star CoRoT-28 is classified as a solar-type yellow star of spectral type G8/9 IV with an effective photospheric temperature of 5,150 K, a radius of 1.78 R☉, a mass of 1.01 M☉, an estimated bolometric luminosity of 2 L☉. Stellar evolution modeling indicates an estimated stellar age of 12 Gyr and a metallicity of [Fe/H] = 0.15 dex (metal-rich relative to the Sun). From Earth, CoRoT-28 shines at apparent V-band magnitude 13.783 (faint and requiring research-grade or CCD telescopic photometry) 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: CoRoT · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | CoRoT-28 |
| Spectral Type | G8/9 IV |
| Effective Temp (Teff) | 5,150 K |
| Stellar Radius | 1.7800 R☉ |
| Stellar Mass | 1.0100 M☉ |
| Bolometric Luminosity | 2 L☉ |
| Metallicity [Fe/H] | 0.150 dex |
| Stellar Age | 12.000 Gyr |
| Apparent Magnitude | V: 13.783 · G: 13.412 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.060300 AU |
| Orbital Period | 5.209 days |
| Mean Orbital Velocity | 125.9 km/s |
| Orbital Eccentricity (e) | 0.04700 |
| Orbital Inclination (i) | 88.1000° |
| Mean Bulk Density | 0.69 g/cm³ (42.4 km/s vesc) |
| Insolation Flux | 672.7522 S⊕ (~915,616 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2499.000 LY (766.183 pc) |