CoRoT-24 c
Astrophysical Synthesis & Habitability Characterization
CoRoT-24 c is a confirmed sub-neptune exoplanet orbiting the star CoRoT-24, located approximately 1929.4 light-years (591.56 parsecs) from the Solar System. First announced in 2014 by CoRoT using the Transit detection technique (producing an estimated primary transit depth of 0.2841% across the stellar disk), this world measures 5 Earth radii (0.45 Jupiter radii) and has a measured mass of 28 Earth masses. Combining its mass and radius yields a mean bulk density of 1.24 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.12 g⊕ (10.98 m/s²), and an escape velocity of 26.5 km/s.
In its orbital architecture around CoRoT-24, CoRoT-24 c completes one full revolution every 11.759 Earth days at a semi-major axis of 0.098 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 90.7 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 850 K (+577°C / +1071°F) and receiving 26.07 S⊕ (~35,475 W/m²), CoRoT-24 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star CoRoT-24 is classified as an orange K-type star of spectral type K1 V with an effective photospheric temperature of 4,950 K, a radius of 0.86 R☉, a mass of 0.91 M☉, an estimated bolometric luminosity of 0.398 L☉. Stellar evolution modeling indicates an estimated stellar age of 11 Gyr and a metallicity of [Fe/H] = 0.3 dex (metal-rich relative to the Sun). From Earth, CoRoT-24 shines at apparent V-band magnitude 15.383 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The CoRoT-24 system is a multi-planet architecture hosting 2 confirmed worlds, with CoRoT-24 c sharing its stellar neighborhood alongside CoRoT-24 b.
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-24 |
| Spectral Type | K1 V |
| Effective Temp (Teff) | 4,950 K |
| Stellar Radius | 0.8600 R☉ |
| Stellar Mass | 0.9100 M☉ |
| Bolometric Luminosity | 0.398 L☉ |
| Metallicity [Fe/H] | 0.300 dex |
| Stellar Age | 11.000 Gyr |
| Apparent Magnitude | V: 15.383 · G: 15.180 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.098000 AU |
| Orbital Period | 11.759 days |
| Mean Orbital Velocity | 90.7 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.0000° |
| Mean Bulk Density | 1.24 g/cm³ (26.5 km/s vesc) |
| Insolation Flux | 26.0656 S⊕ (~35,475 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1929.400 LY (591.555 pc) |